build: Move cli tool sources to a separate subdirectory

This unclutters the top-level directory and groups related files together.

1 files changed, 0 insertions, 1702 deletions

diff --git a/cmdutils.c b/cmdutils.c
deleted file mode 100644
index b0445eb85b..0000000000
--- a/cmdutils.c
+++ /dev/null
@@ -1,1702 +0,0 @@
-/*
- * Various utilities for command line tools
- * Copyright (c) 2000-2003 Fabrice Bellard
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * Libav is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <string.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <math.h>
-
-/* Include only the enabled headers since some compilers (namely, Sun
-   Studio) will not omit unused inline functions and create undefined
-   references to libraries that are not being built. */
-
-#include "config.h"
-#include "libavformat/avformat.h"
-#include "libavfilter/avfilter.h"
-#include "libavdevice/avdevice.h"
-#include "libavresample/avresample.h"
-#include "libswscale/swscale.h"
-#include "libavutil/avassert.h"
-#include "libavutil/avstring.h"
-#include "libavutil/mathematics.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/parseutils.h"
-#include "libavutil/pixdesc.h"
-#include "libavutil/eval.h"
-#include "libavutil/dict.h"
-#include "libavutil/opt.h"
-#include "libavutil/cpu.h"
-#include "avversion.h"
-#include "cmdutils.h"
-#if CONFIG_NETWORK
-#include "libavformat/network.h"
-#endif
-#if HAVE_SYS_RESOURCE_H
-#include <sys/time.h>
-#include <sys/resource.h>
-#endif
-
-struct SwsContext *sws_opts;
-AVDictionary *format_opts, *codec_opts, *resample_opts;
-
-static const int this_year = 2017;
-
-void init_opts(void)
-{
-#if CONFIG_SWSCALE
-    sws_opts = sws_getContext(16, 16, 0, 16, 16, 0, SWS_BICUBIC,
-                              NULL, NULL, NULL);
-#endif
-}
-
-void uninit_opts(void)
-{
-#if CONFIG_SWSCALE
-    sws_freeContext(sws_opts);
-    sws_opts = NULL;
-#endif
-    av_dict_free(&format_opts);
-    av_dict_free(&codec_opts);
-    av_dict_free(&resample_opts);
-}
-
-void log_callback_help(void *ptr, int level, const char *fmt, va_list vl)
-{
-    vfprintf(stdout, fmt, vl);
-}
-
-static void (*program_exit)(int ret);
-
-void register_exit(void (*cb)(int ret))
-{
-    program_exit = cb;
-}
-
-void exit_program(int ret)
-{
-    if (program_exit)
-        program_exit(ret);
-
-    exit(ret);
-}
-
-double parse_number_or_die(const char *context, const char *numstr, int type,
-                           double min, double max)
-{
-    char *tail;
-    const char *error;
-    double d = av_strtod(numstr, &tail);
-    if (*tail)
-        error = "Expected number for %s but found: %s\n";
-    else if (d < min || d > max)
-        error = "The value for %s was %s which is not within %f - %f\n";
-    else if (type == OPT_INT64 && (int64_t)d != d)
-        error = "Expected int64 for %s but found %s\n";
-    else if (type == OPT_INT && (int)d != d)
-        error = "Expected int for %s but found %s\n";
-    else
-        return d;
-    av_log(NULL, AV_LOG_FATAL, error, context, numstr, min, max);
-    exit_program(1);
-    return 0;
-}
-
-int64_t parse_time_or_die(const char *context, const char *timestr,
-                          int is_duration)
-{
-    int64_t us;
-    if (av_parse_time(&us, timestr, is_duration) < 0) {
-        av_log(NULL, AV_LOG_FATAL, "Invalid %s specification for %s: %s\n",
-               is_duration ? "duration" : "date", context, timestr);
-        exit_program(1);
-    }
-    return us;
-}
-
-void show_help_options(const OptionDef *options, const char *msg, int req_flags,
-                       int rej_flags, int alt_flags)
-{
-    const OptionDef *po;
-    int first;
-
-    first = 1;
-    for (po = options; po->name != NULL; po++) {
-        char buf[64];
-
-        if (((po->flags & req_flags) != req_flags) ||
-            (alt_flags && !(po->flags & alt_flags)) ||
-            (po->flags & rej_flags))
-            continue;
-
-        if (first) {
-            printf("%s\n", msg);
-            first = 0;
-        }
-        av_strlcpy(buf, po->name, sizeof(buf));
-        if (po->argname) {
-            av_strlcat(buf, " ", sizeof(buf));
-            av_strlcat(buf, po->argname, sizeof(buf));
-        }
-        printf("-%-17s  %s\n", buf, po->help);
-    }
-    printf("\n");
-}
-
-void show_help_children(const AVClass *class, int flags)
-{
-    const AVClass *child = NULL;
-    av_opt_show2(&class, NULL, flags, 0);
-    printf("\n");
-
-    while (child = av_opt_child_class_next(class, child))
-        show_help_children(child, flags);
-}
-
-static const OptionDef *find_option(const OptionDef *po, const char *name)
-{
-    const char *p = strchr(name, ':');
-    int len = p ? p - name : strlen(name);
-
-    while (po->name) {
-        if (!strncmp(name, po->name, len) && strlen(po->name) == len)
-            break;
-        po++;
-    }
-    return po;
-}
-
-/* _WIN32 means using the windows libc - cygwin doesn't define that
- * by default. HAVE_COMMANDLINETOARGVW is true on cygwin, while
- * it doesn't provide the actual command line via GetCommandLineW(). */
-#if HAVE_COMMANDLINETOARGVW && defined(_WIN32)
-#include <windows.h>
-#include <shellapi.h>
-/* Will be leaked on exit */
-static char** win32_argv_utf8 = NULL;
-static int win32_argc = 0;
-
-/**
- * Prepare command line arguments for executable.
- * For Windows - perform wide-char to UTF-8 conversion.
- * Input arguments should be main() function arguments.
- * @param argc_ptr Arguments number (including executable)
- * @param argv_ptr Arguments list.
- */
-static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
-{
-    char *argstr_flat;
-    wchar_t **argv_w;
-    int i, buffsize = 0, offset = 0;
-
-    if (win32_argv_utf8) {
-        *argc_ptr = win32_argc;
-        *argv_ptr = win32_argv_utf8;
-        return;
-    }
-
-    win32_argc = 0;
-    argv_w = CommandLineToArgvW(GetCommandLineW(), &win32_argc);
-    if (win32_argc <= 0 || !argv_w)
-        return;
-
-    /* determine the UTF-8 buffer size (including NULL-termination symbols) */
-    for (i = 0; i < win32_argc; i++)
-        buffsize += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
-                                        NULL, 0, NULL, NULL);
-
-    win32_argv_utf8 = av_mallocz(sizeof(char *) * (win32_argc + 1) + buffsize);
-    argstr_flat     = (char *)win32_argv_utf8 + sizeof(char *) * (win32_argc + 1);
-    if (!win32_argv_utf8) {
-        LocalFree(argv_w);
-        return;
-    }
-
-    for (i = 0; i < win32_argc; i++) {
-        win32_argv_utf8[i] = &argstr_flat[offset];
-        offset += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
-                                      &argstr_flat[offset],
-                                      buffsize - offset, NULL, NULL);
-    }
-    win32_argv_utf8[i] = NULL;
-    LocalFree(argv_w);
-
-    *argc_ptr = win32_argc;
-    *argv_ptr = win32_argv_utf8;
-}
-#else
-static inline void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
-{
-    /* nothing to do */
-}
-#endif /* HAVE_COMMANDLINETOARGVW */
-
-static int write_option(void *optctx, const OptionDef *po, const char *opt,
-                        const char *arg)
-{
-    /* new-style options contain an offset into optctx, old-style address of
-     * a global var*/
-    void *dst = po->flags & (OPT_OFFSET | OPT_SPEC) ?
-                (uint8_t *)optctx + po->u.off : po->u.dst_ptr;
-    int *dstcount;
-
-    if (po->flags & OPT_SPEC) {
-        SpecifierOpt **so = dst;
-        char *p = strchr(opt, ':');
-        char *str;
-
-        dstcount = (int *)(so + 1);
-        *so = grow_array(*so, sizeof(**so), dstcount, *dstcount + 1);
-        str = av_strdup(p ? p + 1 : "");
-        if (!str)
-            return AVERROR(ENOMEM);
-        (*so)[*dstcount - 1].specifier = str;
-        dst = &(*so)[*dstcount - 1].u;
-    }
-
-    if (po->flags & OPT_STRING) {
-        char *str;
-        str = av_strdup(arg);
-        av_freep(dst);
-        if (!str)
-            return AVERROR(ENOMEM);
-        *(char **)dst = str;
-    } else if (po->flags & OPT_BOOL || po->flags & OPT_INT) {
-        *(int *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
-    } else if (po->flags & OPT_INT64) {
-        *(int64_t *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT64_MIN, INT64_MAX);
-    } else if (po->flags & OPT_TIME) {
-        *(int64_t *)dst = parse_time_or_die(opt, arg, 1);
-    } else if (po->flags & OPT_FLOAT) {
-        *(float *)dst = parse_number_or_die(opt, arg, OPT_FLOAT, -INFINITY, INFINITY);
-    } else if (po->flags & OPT_DOUBLE) {
-        *(double *)dst = parse_number_or_die(opt, arg, OPT_DOUBLE, -INFINITY, INFINITY);
-    } else if (po->u.func_arg) {
-        int ret = po->u.func_arg(optctx, opt, arg);
-        if (ret < 0) {
-            av_log(NULL, AV_LOG_ERROR,
-                   "Failed to set value '%s' for option '%s'\n", arg, opt);
-            return ret;
-        }
-    }
-    if (po->flags & OPT_EXIT)
-        exit_program(0);
-
-    return 0;
-}
-
-int parse_option(void *optctx, const char *opt, const char *arg,
-                 const OptionDef *options)
-{
-    const OptionDef *po;
-    int ret;
-
-    po = find_option(options, opt);
-    if (!po->name && opt[0] == 'n' && opt[1] == 'o') {
-        /* handle 'no' bool option */
-        po = find_option(options, opt + 2);
-        if ((po->name && (po->flags & OPT_BOOL)))
-            arg = "0";
-    } else if (po->flags & OPT_BOOL)
-        arg = "1";
-
-    if (!po->name)
-        po = find_option(options, "default");
-    if (!po->name) {
-        av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'\n", opt);
-        return AVERROR(EINVAL);
-    }
-    if (po->flags & HAS_ARG && !arg) {
-        av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'\n", opt);
-        return AVERROR(EINVAL);
-    }
-
-    ret = write_option(optctx, po, opt, arg);
-    if (ret < 0)
-        return ret;
-
-    return !!(po->flags & HAS_ARG);
-}
-
-void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
-                   void (*parse_arg_function)(void *, const char*))
-{
-    const char *opt;
-    int optindex, handleoptions = 1, ret;
-
-    /* perform system-dependent conversions for arguments list */
-    prepare_app_arguments(&argc, &argv);
-
-    /* parse options */
-    optindex = 1;
-    while (optindex < argc) {
-        opt = argv[optindex++];
-
-        if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
-            if (opt[1] == '-' && opt[2] == '\0') {
-                handleoptions = 0;
-                continue;
-            }
-            opt++;
-
-            if ((ret = parse_option(optctx, opt, argv[optindex], options)) < 0)
-                exit_program(1);
-            optindex += ret;
-        } else {
-            if (parse_arg_function)
-                parse_arg_function(optctx, opt);
-        }
-    }
-}
-
-int parse_optgroup(void *optctx, OptionGroup *g)
-{
-    int i, ret;
-
-    av_log(NULL, AV_LOG_DEBUG, "Parsing a group of options: %s %s.\n",
-           g->group_def->name, g->arg);
-
-    for (i = 0; i < g->nb_opts; i++) {
-        Option *o = &g->opts[i];
-
-        if (g->group_def->flags &&
-            !(g->group_def->flags & o->opt->flags)) {
-            av_log(NULL, AV_LOG_ERROR, "Option %s (%s) cannot be applied to "
-                   "%s %s -- you are trying to apply an input option to an "
-                   "output file or vice versa. Move this option before the "
-                   "file it belongs to.\n", o->key, o->opt->help,
-                   g->group_def->name, g->arg);
-            return AVERROR(EINVAL);
-        }
-
-        av_log(NULL, AV_LOG_DEBUG, "Applying option %s (%s) with argument %s.\n",
-               o->key, o->opt->help, o->val);
-
-        ret = write_option(optctx, o->opt, o->key, o->val);
-        if (ret < 0)
-            return ret;
-    }
-
-    av_log(NULL, AV_LOG_DEBUG, "Successfully parsed a group of options.\n");
-
-    return 0;
-}
-
-int locate_option(int argc, char **argv, const OptionDef *options,
-                  const char *optname)
-{
-    const OptionDef *po;
-    int i;
-
-    for (i = 1; i < argc; i++) {
-        const char *cur_opt = argv[i];
-
-        if (*cur_opt++ != '-')
-            continue;
-
-        po = find_option(options, cur_opt);
-        if (!po->name && cur_opt[0] == 'n' && cur_opt[1] == 'o')
-            po = find_option(options, cur_opt + 2);
-
-        if ((!po->name && !strcmp(cur_opt, optname)) ||
-             (po->name && !strcmp(optname, po->name)))
-            return i;
-
-        if (!po->name || po->flags & HAS_ARG)
-            i++;
-    }
-    return 0;
-}
-
-void parse_loglevel(int argc, char **argv, const OptionDef *options)
-{
-    int idx = locate_option(argc, argv, options, "loglevel");
-    if (!idx)
-        idx = locate_option(argc, argv, options, "v");
-    if (idx && argv[idx + 1])
-        opt_loglevel(NULL, "loglevel", argv[idx + 1]);
-}
-
-#define FLAGS (o->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0
-int opt_default(void *optctx, const char *opt, const char *arg)
-{
-    const AVOption *o;
-    char opt_stripped[128];
-    const char *p;
-    const AVClass *cc = avcodec_get_class(), *fc = avformat_get_class();
-#if CONFIG_AVRESAMPLE
-    const AVClass *rc = avresample_get_class();
-#endif
-#if CONFIG_SWSCALE
-    const AVClass *sc = sws_get_class();
-#endif
-
-    if (!(p = strchr(opt, ':')))
-        p = opt + strlen(opt);
-    av_strlcpy(opt_stripped, opt, FFMIN(sizeof(opt_stripped), p - opt + 1));
-
-    if ((o = av_opt_find(&cc, opt_stripped, NULL, 0,
-                         AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) ||
-        ((opt[0] == 'v' || opt[0] == 'a' || opt[0] == 's') &&
-         (o = av_opt_find(&cc, opt + 1, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ))))
-        av_dict_set(&codec_opts, opt, arg, FLAGS);
-    else if ((o = av_opt_find(&fc, opt, NULL, 0,
-                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)))
-        av_dict_set(&format_opts, opt, arg, FLAGS);
-#if CONFIG_AVRESAMPLE
-    else if ((o = av_opt_find(&rc, opt, NULL, 0,
-                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)))
-        av_dict_set(&resample_opts, opt, arg, FLAGS);
-#endif
-#if CONFIG_SWSCALE
-    else if ((o = av_opt_find(&sc, opt, NULL, 0,
-                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
-        // XXX we only support sws_flags, not arbitrary sws options
-        int ret = av_opt_set(sws_opts, opt, arg, 0);
-        if (ret < 0) {
-            av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
-            return ret;
-        }
-    }
-#endif
-
-    if (o)
-        return 0;
-    return AVERROR_OPTION_NOT_FOUND;
-}
-
-/*
- * Check whether given option is a group separator.
- *
- * @return index of the group definition that matched or -1 if none
- */
-static int match_group_separator(const OptionGroupDef *groups, int nb_groups,
-                                 const char *opt)
-{
-    int i;
-
-    for (i = 0; i < nb_groups; i++) {
-        const OptionGroupDef *p = &groups[i];
-        if (p->sep && !strcmp(p->sep, opt))
-            return i;
-    }
-
-    return -1;
-}
-
-/*
- * Finish parsing an option group.
- *
- * @param group_idx which group definition should this group belong to
- * @param arg argument of the group delimiting option
- */
-static void finish_group(OptionParseContext *octx, int group_idx,
-                         const char *arg)
-{
-    OptionGroupList *l = &octx->groups[group_idx];
-    OptionGroup *g;
-
-    GROW_ARRAY(l->groups, l->nb_groups);
-    g = &l->groups[l->nb_groups - 1];
-
-    *g             = octx->cur_group;
-    g->arg         = arg;
-    g->group_def   = l->group_def;
-#if CONFIG_SWSCALE
-    g->sws_opts    = sws_opts;
-#endif
-    g->codec_opts  = codec_opts;
-    g->format_opts = format_opts;
-    g->resample_opts = resample_opts;
-
-    codec_opts  = NULL;
-    format_opts = NULL;
-    resample_opts = NULL;
-#if CONFIG_SWSCALE
-    sws_opts    = NULL;
-#endif
-    init_opts();
-
-    memset(&octx->cur_group, 0, sizeof(octx->cur_group));
-}
-
-/*
- * Add an option instance to currently parsed group.
- */
-static void add_opt(OptionParseContext *octx, const OptionDef *opt,
-                    const char *key, const char *val)
-{
-    int global = !(opt->flags & (OPT_PERFILE | OPT_SPEC | OPT_OFFSET));
-    OptionGroup *g = global ? &octx->global_opts : &octx->cur_group;
-
-    GROW_ARRAY(g->opts, g->nb_opts);
-    g->opts[g->nb_opts - 1].opt = opt;
-    g->opts[g->nb_opts - 1].key = key;
-    g->opts[g->nb_opts - 1].val = val;
-}
-
-static void init_parse_context(OptionParseContext *octx,
-                               const OptionGroupDef *groups, int nb_groups)
-{
-    static const OptionGroupDef global_group = { "global" };
-    int i;
-
-    memset(octx, 0, sizeof(*octx));
-
-    octx->nb_groups = nb_groups;
-    octx->groups    = av_mallocz(sizeof(*octx->groups) * octx->nb_groups);
-    if (!octx->groups)
-        exit_program(1);
-
-    for (i = 0; i < octx->nb_groups; i++)
-        octx->groups[i].group_def = &groups[i];
-
-    octx->global_opts.group_def = &global_group;
-    octx->global_opts.arg       = "";
-
-    init_opts();
-}
-
-void uninit_parse_context(OptionParseContext *octx)
-{
-    int i, j;
-
-    for (i = 0; i < octx->nb_groups; i++) {
-        OptionGroupList *l = &octx->groups[i];
-
-        for (j = 0; j < l->nb_groups; j++) {
-            av_freep(&l->groups[j].opts);
-            av_dict_free(&l->groups[j].codec_opts);
-            av_dict_free(&l->groups[j].format_opts);
-            av_dict_free(&l->groups[j].resample_opts);
-#if CONFIG_SWSCALE
-            sws_freeContext(l->groups[j].sws_opts);
-#endif
-        }
-        av_freep(&l->groups);
-    }
-    av_freep(&octx->groups);
-
-    av_freep(&octx->cur_group.opts);
-    av_freep(&octx->global_opts.opts);
-
-    uninit_opts();
-}
-
-int split_commandline(OptionParseContext *octx, int argc, char *argv[],
-                      const OptionDef *options,
-                      const OptionGroupDef *groups, int nb_groups)
-{
-    int optindex = 1;
-
-    /* perform system-dependent conversions for arguments list */
-    prepare_app_arguments(&argc, &argv);
-
-    init_parse_context(octx, groups, nb_groups);
-    av_log(NULL, AV_LOG_DEBUG, "Splitting the commandline.\n");
-
-    while (optindex < argc) {
-        const char *opt = argv[optindex++], *arg;
-        const OptionDef *po;
-        int ret;
-
-        av_log(NULL, AV_LOG_DEBUG, "Reading option '%s' ...", opt);
-
-        /* unnamed group separators, e.g. output filename */
-        if (opt[0] != '-' || !opt[1]) {
-            finish_group(octx, 0, opt);
-            av_log(NULL, AV_LOG_DEBUG, " matched as %s.\n", groups[0].name);
-            continue;
-        }
-        opt++;
-
-#define GET_ARG(arg)                                                           \
-do {                                                                           \
-    arg = argv[optindex++];                                                    \
-    if (!arg) {                                                                \
-        av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'.\n", opt);\
-        return AVERROR(EINVAL);                                                \
-    }                                                                          \
-} while (0)
-
-        /* named group separators, e.g. -i */
-        if ((ret = match_group_separator(groups, nb_groups, opt)) >= 0) {
-            GET_ARG(arg);
-            finish_group(octx, ret, arg);
-            av_log(NULL, AV_LOG_DEBUG, " matched as %s with argument '%s'.\n",
-                   groups[ret].name, arg);
-            continue;
-        }
-
-        /* normal options */
-        po = find_option(options, opt);
-        if (po->name) {
-            if (po->flags & OPT_EXIT) {
-                /* optional argument, e.g. -h */
-                arg = argv[optindex++];
-            } else if (po->flags & HAS_ARG) {
-                GET_ARG(arg);
-            } else {
-                arg = "1";
-            }
-
-            add_opt(octx, po, opt, arg);
-            av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
-                   "argument '%s'.\n", po->name, po->help, arg);
-            continue;
-        }
-
-        /* AVOptions */
-        if (argv[optindex]) {
-            ret = opt_default(NULL, opt, argv[optindex]);
-            if (ret >= 0) {
-                av_log(NULL, AV_LOG_DEBUG, " matched as AVOption '%s' with "
-                       "argument '%s'.\n", opt, argv[optindex]);
-                optindex++;
-                continue;
-            } else if (ret != AVERROR_OPTION_NOT_FOUND) {
-                av_log(NULL, AV_LOG_ERROR, "Error parsing option '%s' "
-                       "with argument '%s'.\n", opt, argv[optindex]);
-                return ret;
-            }
-        }
-
-        /* boolean -nofoo options */
-        if (opt[0] == 'n' && opt[1] == 'o' &&
-            (po = find_option(options, opt + 2)) &&
-            po->name && po->flags & OPT_BOOL) {
-            add_opt(octx, po, opt, "0");
-            av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
-                   "argument 0.\n", po->name, po->help);
-            continue;
-        }
-
-        av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'.\n", opt);
-        return AVERROR_OPTION_NOT_FOUND;
-    }
-
-    if (octx->cur_group.nb_opts || codec_opts || format_opts || resample_opts)
-        av_log(NULL, AV_LOG_WARNING, "Trailing options were found on the "
-               "commandline.\n");
-
-    av_log(NULL, AV_LOG_DEBUG, "Finished splitting the commandline.\n");
-
-    return 0;
-}
-
-int opt_cpuflags(void *optctx, const char *opt, const char *arg)
-{
-    int flags = av_parse_cpu_flags(arg);
-
-    if (flags < 0)
-        return flags;
-
-    av_set_cpu_flags_mask(flags);
-    return 0;
-}
-
-int opt_loglevel(void *optctx, const char *opt, const char *arg)
-{
-    const struct { const char *name; int level; } log_levels[] = {
-        { "quiet"  , AV_LOG_QUIET   },
-        { "panic"  , AV_LOG_PANIC   },
-        { "fatal"  , AV_LOG_FATAL   },
-        { "error"  , AV_LOG_ERROR   },
-        { "warning", AV_LOG_WARNING },
-        { "info"   , AV_LOG_INFO    },
-        { "verbose", AV_LOG_VERBOSE },
-        { "debug"  , AV_LOG_DEBUG   },
-        { "trace"  , AV_LOG_TRACE   },
-    };
-    char *tail;
-    int level;
-    int i;
-
-    for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++) {
-        if (!strcmp(log_levels[i].name, arg)) {
-            av_log_set_level(log_levels[i].level);
-            return 0;
-        }
-    }
-
-    level = strtol(arg, &tail, 10);
-    if (*tail) {
-        av_log(NULL, AV_LOG_FATAL, "Invalid loglevel \"%s\". "
-               "Possible levels are numbers or:\n", arg);
-        for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
-            av_log(NULL, AV_LOG_FATAL, "\"%s\"\n", log_levels[i].name);
-        exit_program(1);
-    }
-    av_log_set_level(level);
-    return 0;
-}
-
-int opt_timelimit(void *optctx, const char *opt, const char *arg)
-{
-#if HAVE_SETRLIMIT
-    int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
-    struct rlimit rl = { lim, lim + 1 };
-    if (setrlimit(RLIMIT_CPU, &rl))
-        perror("setrlimit");
-#else
-    av_log(NULL, AV_LOG_WARNING, "-%s not implemented on this OS\n", opt);
-#endif
-    return 0;
-}
-
-void print_error(const char *filename, int err)
-{
-    char errbuf[128];
-    const char *errbuf_ptr = errbuf;
-
-    if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
-        errbuf_ptr = strerror(AVUNERROR(err));
-    av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
-}
-
-static int warned_cfg = 0;
-
-#define INDENT        1
-#define SHOW_VERSION  2
-#define SHOW_CONFIG   4
-
-#define PRINT_LIB_INFO(libname, LIBNAME, flags, level)                  \
-    if (CONFIG_##LIBNAME) {                                             \
-        const char *indent = flags & INDENT? "  " : "";                 \
-        if (flags & SHOW_VERSION) {                                     \
-            unsigned int version = libname##_version();                 \
-            av_log(NULL, level,                                         \
-                   "%slib%-10s %2d.%3d.%2d / %2d.%3d.%2d\n",            \
-                   indent, #libname,                                    \
-                   LIB##LIBNAME##_VERSION_MAJOR,                        \
-                   LIB##LIBNAME##_VERSION_MINOR,                        \
-                   LIB##LIBNAME##_VERSION_MICRO,                        \
-                   version >> 16, version >> 8 & 0xff, version & 0xff); \
-        }                                                               \
-        if (flags & SHOW_CONFIG) {                                      \
-            const char *cfg = libname##_configuration();                \
-            if (strcmp(LIBAV_CONFIGURATION, cfg)) {                     \
-                if (!warned_cfg) {                                      \
-                    av_log(NULL, level,                                 \
-                            "%sWARNING: library configuration mismatch\n", \
-                            indent);                                    \
-                    warned_cfg = 1;                                     \
-                }                                                       \
-                av_log(NULL, level, "%s%-11s configuration: %s\n",      \
-                        indent, #libname, cfg);                         \
-            }                                                           \
-        }                                                               \
-    }                                                                   \
-
-static void print_all_libs_info(int flags, int level)
-{
-    PRINT_LIB_INFO(avutil,   AVUTIL,   flags, level);
-    PRINT_LIB_INFO(avcodec,  AVCODEC,  flags, level);
-    PRINT_LIB_INFO(avformat, AVFORMAT, flags, level);
-    PRINT_LIB_INFO(avdevice, AVDEVICE, flags, level);
-    PRINT_LIB_INFO(avfilter, AVFILTER, flags, level);
-    PRINT_LIB_INFO(avresample, AVRESAMPLE, flags, level);
-    PRINT_LIB_INFO(swscale,  SWSCALE,  flags, level);
-}
-
-void show_banner(void)
-{
-    av_log(NULL, AV_LOG_INFO,
-           "%s version " LIBAV_VERSION ", Copyright (c) %d-%d the Libav developers\n",
-           program_name, program_birth_year, this_year);
-    av_log(NULL, AV_LOG_INFO, "  built on %s %s with %s\n",
-           __DATE__, __TIME__, CC_IDENT);
-    av_log(NULL, AV_LOG_VERBOSE, "  configuration: " LIBAV_CONFIGURATION "\n");
-    print_all_libs_info(INDENT|SHOW_CONFIG,  AV_LOG_VERBOSE);
-    print_all_libs_info(INDENT|SHOW_VERSION, AV_LOG_VERBOSE);
-}
-
-int show_version(void *optctx, const char *opt, const char *arg)
-{
-    av_log_set_callback(log_callback_help);
-    printf("%s " LIBAV_VERSION "\n", program_name);
-    print_all_libs_info(SHOW_VERSION, AV_LOG_INFO);
-
-    return 0;
-}
-
-int show_license(void *optctx, const char *opt, const char *arg)
-{
-    printf(
-#if CONFIG_NONFREE
-    "This version of %s has nonfree parts compiled in.\n"
-    "Therefore it is not legally redistributable.\n",
-    program_name
-#elif CONFIG_GPLV3
-    "%s is free software; you can redistribute it and/or modify\n"
-    "it under the terms of the GNU General Public License as published by\n"
-    "the Free Software Foundation; either version 3 of the License, or\n"
-    "(at your option) any later version.\n"
-    "\n"
-    "%s is distributed in the hope that it will be useful,\n"
-    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
-    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
-    "GNU General Public License for more details.\n"
-    "\n"
-    "You should have received a copy of the GNU General Public License\n"
-    "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
-    program_name, program_name, program_name
-#elif CONFIG_GPL
-    "%s is free software; you can redistribute it and/or modify\n"
-    "it under the terms of the GNU General Public License as published by\n"
-    "the Free Software Foundation; either version 2 of the License, or\n"
-    "(at your option) any later version.\n"
-    "\n"
-    "%s is distributed in the hope that it will be useful,\n"
-    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
-    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
-    "GNU General Public License for more details.\n"
-    "\n"
-    "You should have received a copy of the GNU General Public License\n"
-    "along with %s; if not, write to the Free Software\n"
-    "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
-    program_name, program_name, program_name
-#elif CONFIG_LGPLV3
-    "%s is free software; you can redistribute it and/or modify\n"
-    "it under the terms of the GNU Lesser General Public License as published by\n"
-    "the Free Software Foundation; either version 3 of the License, or\n"
-    "(at your option) any later version.\n"
-    "\n"
-    "%s is distributed in the hope that it will be useful,\n"
-    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
-    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
-    "GNU Lesser General Public License for more details.\n"
-    "\n"
-    "You should have received a copy of the GNU Lesser General Public License\n"
-    "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
-    program_name, program_name, program_name
-#else
-    "%s is free software; you can redistribute it and/or\n"
-    "modify it under the terms of the GNU Lesser General Public\n"
-    "License as published by the Free Software Foundation; either\n"
-    "version 2.1 of the License, or (at your option) any later version.\n"
-    "\n"
-    "%s is distributed in the hope that it will be useful,\n"
-    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
-    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
-    "Lesser General Public License for more details.\n"
-    "\n"
-    "You should have received a copy of the GNU Lesser General Public\n"
-    "License along with %s; if not, write to the Free Software\n"
-    "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
-    program_name, program_name, program_name
-#endif
-    );
-
-    return 0;
-}
-
-int show_formats(void *optctx, const char *opt, const char *arg)
-{
-    AVInputFormat *ifmt  = NULL;
-    AVOutputFormat *ofmt = NULL;
-    const char *last_name;
-
-    printf("File formats:\n"
-           " D. = Demuxing supported\n"
-           " .E = Muxing supported\n"
-           " --\n");
-    last_name = "000";
-    for (;;) {
-        int decode = 0;
-        int encode = 0;
-        const char *name      = NULL;
-        const char *long_name = NULL;
-
-        while ((ofmt = av_oformat_next(ofmt))) {
-            if ((!name || strcmp(ofmt->name, name) < 0) &&
-                strcmp(ofmt->name, last_name) > 0) {
-                name      = ofmt->name;
-                long_name = ofmt->long_name;
-                encode    = 1;
-            }
-        }
-        while ((ifmt = av_iformat_next(ifmt))) {
-            if ((!name || strcmp(ifmt->name, name) < 0) &&
-                strcmp(ifmt->name, last_name) > 0) {
-                name      = ifmt->name;
-                long_name = ifmt->long_name;
-                encode    = 0;
-            }
-            if (name && strcmp(ifmt->name, name) == 0)
-                decode = 1;
-        }
-        if (!name)
-            break;
-        last_name = name;
-
-        printf(" %s%s %-15s %s\n",
-               decode ? "D" : " ",
-               encode ? "E" : " ",
-               name,
-            long_name ? long_name:" ");
-    }
-    return 0;
-}
-
-#define PRINT_CODEC_SUPPORTED(codec, field, type, list_name, term, get_name) \
-    if (codec->field) {                                                      \
-        const type *p = c->field;                                            \
-                                                                             \
-        printf("    Supported " list_name ":");                              \
-        while (*p != term) {                                                 \
-            get_name(*p);                                                    \
-            printf(" %s", name);                                             \
-            p++;                                                             \
-        }                                                                    \
-        printf("\n");                                                        \
-    }                                                                        \
-
-static void print_codec(const AVCodec *c)
-{
-    int encoder = av_codec_is_encoder(c);
-
-    printf("%s %s [%s]:\n", encoder ? "Encoder" : "Decoder", c->name,
-           c->long_name ? c->long_name : "");
-
-    printf("    General capabilities: ");
-    if (c->capabilities & AV_CODEC_CAP_DRAW_HORIZ_BAND)
-        printf("horizband ");
-    if (c->capabilities & AV_CODEC_CAP_DR1)
-        printf("dr1 ");
-    if (c->capabilities & AV_CODEC_CAP_TRUNCATED)
-        printf("trunc ");
-    if (c->capabilities & AV_CODEC_CAP_DELAY)
-        printf("delay ");
-    if (c->capabilities & AV_CODEC_CAP_SMALL_LAST_FRAME)
-        printf("small ");
-    if (c->capabilities & AV_CODEC_CAP_SUBFRAMES)
-        printf("subframes ");
-    if (c->capabilities & AV_CODEC_CAP_EXPERIMENTAL)
-        printf("exp ");
-    if (c->capabilities & AV_CODEC_CAP_CHANNEL_CONF)
-        printf("chconf ");
-    if (c->capabilities & AV_CODEC_CAP_PARAM_CHANGE)
-        printf("paramchange ");
-    if (c->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
-        printf("variable ");
-    if (c->capabilities & (AV_CODEC_CAP_FRAME_THREADS |
-                           AV_CODEC_CAP_SLICE_THREADS |
-                           AV_CODEC_CAP_AUTO_THREADS))
-        printf("threads ");
-    if (!c->capabilities)
-        printf("none");
-    printf("\n");
-
-    if (c->type == AVMEDIA_TYPE_VIDEO) {
-        printf("    Threading capabilities: ");
-        switch (c->capabilities & (AV_CODEC_CAP_FRAME_THREADS |
-                                   AV_CODEC_CAP_SLICE_THREADS |
-                                   AV_CODEC_CAP_AUTO_THREADS)) {
-        case AV_CODEC_CAP_FRAME_THREADS |
-             AV_CODEC_CAP_SLICE_THREADS: printf("frame and slice"); break;
-        case AV_CODEC_CAP_FRAME_THREADS: printf("frame");           break;
-        case AV_CODEC_CAP_SLICE_THREADS: printf("slice");           break;
-        case AV_CODEC_CAP_AUTO_THREADS : printf("auto");            break;
-        default:                         printf("none");            break;
-        }
-        printf("\n");
-    }
-
-    if (c->supported_framerates) {
-        const AVRational *fps = c->supported_framerates;
-
-        printf("    Supported framerates:");
-        while (fps->num) {
-            printf(" %d/%d", fps->num, fps->den);
-            fps++;
-        }
-        printf("\n");
-    }
-    PRINT_CODEC_SUPPORTED(c, pix_fmts, enum AVPixelFormat, "pixel formats",
-                          AV_PIX_FMT_NONE, GET_PIX_FMT_NAME);
-    PRINT_CODEC_SUPPORTED(c, supported_samplerates, int, "sample rates", 0,
-                          GET_SAMPLE_RATE_NAME);
-    PRINT_CODEC_SUPPORTED(c, sample_fmts, enum AVSampleFormat, "sample formats",
-                          AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME);
-    PRINT_CODEC_SUPPORTED(c, channel_layouts, uint64_t, "channel layouts",
-                          0, GET_CH_LAYOUT_DESC);
-
-    if (c->priv_class) {
-        show_help_children(c->priv_class,
-                           AV_OPT_FLAG_ENCODING_PARAM |
-                           AV_OPT_FLAG_DECODING_PARAM);
-    }
-}
-
-static char get_media_type_char(enum AVMediaType type)
-{
-    switch (type) {
-        case AVMEDIA_TYPE_VIDEO:    return 'V';
-        case AVMEDIA_TYPE_AUDIO:    return 'A';
-        case AVMEDIA_TYPE_SUBTITLE: return 'S';
-        default:                    return '?';
-    }
-}
-
-static const AVCodec *next_codec_for_id(enum AVCodecID id, const AVCodec *prev,
-                                        int encoder)
-{
-    while ((prev = av_codec_next(prev))) {
-        if (prev->id == id &&
-            (encoder ? av_codec_is_encoder(prev) : av_codec_is_decoder(prev)))
-            return prev;
-    }
-    return NULL;
-}
-
-static void print_codecs_for_id(enum AVCodecID id, int encoder)
-{
-    const AVCodec *codec = NULL;
-
-    printf(" (%s: ", encoder ? "encoders" : "decoders");
-
-    while ((codec = next_codec_for_id(id, codec, encoder)))
-        printf("%s ", codec->name);
-
-    printf(")");
-}
-
-int show_codecs(void *optctx, const char *opt, const char *arg)
-{
-    const AVCodecDescriptor *desc = NULL;
-
-    printf("Codecs:\n"
-           " D..... = Decoding supported\n"
-           " .E.... = Encoding supported\n"
-           " ..V... = Video codec\n"
-           " ..A... = Audio codec\n"
-           " ..S... = Subtitle codec\n"
-           " ...I.. = Intra frame-only codec\n"
-           " ....L. = Lossy compression\n"
-           " .....S = Lossless compression\n"
-           " -------\n");
-    while ((desc = avcodec_descriptor_next(desc))) {
-        const AVCodec *codec = NULL;
-
-        printf(avcodec_find_decoder(desc->id) ? "D" : ".");
-        printf(avcodec_find_encoder(desc->id) ? "E" : ".");
-
-        printf("%c", get_media_type_char(desc->type));
-        printf((desc->props & AV_CODEC_PROP_INTRA_ONLY) ? "I" : ".");
-        printf((desc->props & AV_CODEC_PROP_LOSSY)      ? "L" : ".");
-        printf((desc->props & AV_CODEC_PROP_LOSSLESS)   ? "S" : ".");
-
-        printf(" %-20s %s", desc->name, desc->long_name ? desc->long_name : "");
-
-        /* print decoders/encoders when there's more than one or their
-         * names are different from codec name */
-        while ((codec = next_codec_for_id(desc->id, codec, 0))) {
-            if (strcmp(codec->name, desc->name)) {
-                print_codecs_for_id(desc->id, 0);
-                break;
-            }
-        }
-        codec = NULL;
-        while ((codec = next_codec_for_id(desc->id, codec, 1))) {
-            if (strcmp(codec->name, desc->name)) {
-                print_codecs_for_id(desc->id, 1);
-                break;
-            }
-        }
-
-        printf("\n");
-    }
-    return 0;
-}
-
-static void print_codecs(int encoder)
-{
-    const AVCodecDescriptor *desc = NULL;
-
-    printf("%s:\n"
-           " V... = Video\n"
-           " A... = Audio\n"
-           " S... = Subtitle\n"
-           " .F.. = Frame-level multithreading\n"
-           " ..S. = Slice-level multithreading\n"
-           " ...X = Codec is experimental\n"
-           " ---\n",
-           encoder ? "Encoders" : "Decoders");
-    while ((desc = avcodec_descriptor_next(desc))) {
-        const AVCodec *codec = NULL;
-
-        while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
-            printf("%c", get_media_type_char(desc->type));
-            printf((codec->capabilities & AV_CODEC_CAP_FRAME_THREADS) ? "F" : ".");
-            printf((codec->capabilities & AV_CODEC_CAP_SLICE_THREADS) ? "S" : ".");
-            printf((codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL)  ? "X" : ".");
-
-            printf(" %-20s %s", codec->name, codec->long_name ? codec->long_name : "");
-            if (strcmp(codec->name, desc->name))
-                printf(" (codec %s)", desc->name);
-
-            printf("\n");
-        }
-    }
-}
-
-int show_decoders(void *optctx, const char *opt, const char *arg)
-{
-    print_codecs(0);
-    return 0;
-}
-
-int show_encoders(void *optctx, const char *opt, const char *arg)
-{
-    print_codecs(1);
-    return 0;
-}
-
-int show_bsfs(void *optctx, const char *opt, const char *arg)
-{
-    const AVBitStreamFilter *bsf = NULL;
-    void *opaque = NULL;
-
-    printf("Bitstream filters:\n");
-    while ((bsf = av_bsf_next(&opaque)))
-        printf("%s\n", bsf->name);
-    printf("\n");
-    return 0;
-}
-
-int show_protocols(void *optctx, const char *opt, const char *arg)
-{
-    void *opaque = NULL;
-    const char *name;
-
-    printf("Supported file protocols:\n"
-           "Input:\n");
-    while ((name = avio_enum_protocols(&opaque, 0)))
-        printf("%s\n", name);
-    printf("Output:\n");
-    while ((name = avio_enum_protocols(&opaque, 1)))
-        printf("%s\n", name);
-    return 0;
-}
-
-int show_filters(void *optctx, const char *opt, const char *arg)
-{
-#if CONFIG_AVFILTER
-    const AVFilter *filter = NULL;
-
-    printf("Filters:\n");
-    while ((filter = avfilter_next(filter)))
-        printf("%-16s %s\n", filter->name, filter->description);
-#else
-    printf("No filters available: libavfilter disabled\n");
-#endif
-    return 0;
-}
-
-int show_pix_fmts(void *optctx, const char *opt, const char *arg)
-{
-    const AVPixFmtDescriptor *pix_desc = NULL;
-
-    printf("Pixel formats:\n"
-           "I.... = Supported Input  format for conversion\n"
-           ".O... = Supported Output format for conversion\n"
-           "..H.. = Hardware accelerated format\n"
-           "...P. = Paletted format\n"
-           "....B = Bitstream format\n"
-           "FLAGS NAME            NB_COMPONENTS BITS_PER_PIXEL\n"
-           "-----\n");
-
-#if !CONFIG_SWSCALE
-#   define sws_isSupportedInput(x)  0
-#   define sws_isSupportedOutput(x) 0
-#endif
-
-    while ((pix_desc = av_pix_fmt_desc_next(pix_desc))) {
-        enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(pix_desc);
-        printf("%c%c%c%c%c %-16s       %d            %2d\n",
-               sws_isSupportedInput (pix_fmt)              ? 'I' : '.',
-               sws_isSupportedOutput(pix_fmt)              ? 'O' : '.',
-               pix_desc->flags & AV_PIX_FMT_FLAG_HWACCEL   ? 'H' : '.',
-               pix_desc->flags & AV_PIX_FMT_FLAG_PAL       ? 'P' : '.',
-               pix_desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ? 'B' : '.',
-               pix_desc->name,
-               pix_desc->nb_components,
-               av_get_bits_per_pixel(pix_desc));
-    }
-    return 0;
-}
-
-int show_sample_fmts(void *optctx, const char *opt, const char *arg)
-{
-    int i;
-    char fmt_str[128];
-    for (i = -1; i < AV_SAMPLE_FMT_NB; i++)
-        printf("%s\n", av_get_sample_fmt_string(fmt_str, sizeof(fmt_str), i));
-    return 0;
-}
-
-static void show_help_codec(const char *name, int encoder)
-{
-    const AVCodecDescriptor *desc;
-    const AVCodec *codec;
-
-    if (!name) {
-        av_log(NULL, AV_LOG_ERROR, "No codec name specified.\n");
-        return;
-    }
-
-    codec = encoder ? avcodec_find_encoder_by_name(name) :
-                      avcodec_find_decoder_by_name(name);
-
-    if (codec)
-        print_codec(codec);
-    else if ((desc = avcodec_descriptor_get_by_name(name))) {
-        int printed = 0;
-
-        while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
-            printed = 1;
-            print_codec(codec);
-        }
-
-        if (!printed) {
-            av_log(NULL, AV_LOG_ERROR, "Codec '%s' is known to Libav, "
-                   "but no %s for it are available. Libav might need to be "
-                   "recompiled with additional external libraries.\n",
-                   name, encoder ? "encoders" : "decoders");
-        }
-    } else {
-        av_log(NULL, AV_LOG_ERROR, "Codec '%s' is not recognized by Libav.\n",
-               name);
-    }
-}
-
-static void show_help_demuxer(const char *name)
-{
-    const AVInputFormat *fmt = av_find_input_format(name);
-
-    if (!fmt) {
-        av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
-        return;
-    }
-
-    printf("Demuxer %s [%s]:\n", fmt->name, fmt->long_name);
-
-    if (fmt->extensions)
-        printf("    Common extensions: %s.\n", fmt->extensions);
-
-    if (fmt->priv_class)
-        show_help_children(fmt->priv_class, AV_OPT_FLAG_DECODING_PARAM);
-}
-
-static void show_help_muxer(const char *name)
-{
-    const AVCodecDescriptor *desc;
-    const AVOutputFormat *fmt = av_guess_format(name, NULL, NULL);
-
-    if (!fmt) {
-        av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
-        return;
-    }
-
-    printf("Muxer %s [%s]:\n", fmt->name, fmt->long_name);
-
-    if (fmt->extensions)
-        printf("    Common extensions: %s.\n", fmt->extensions);
-    if (fmt->mime_type)
-        printf("    Mime type: %s.\n", fmt->mime_type);
-    if (fmt->video_codec != AV_CODEC_ID_NONE &&
-        (desc = avcodec_descriptor_get(fmt->video_codec))) {
-        printf("    Default video codec: %s.\n", desc->name);
-    }
-    if (fmt->audio_codec != AV_CODEC_ID_NONE &&
-        (desc = avcodec_descriptor_get(fmt->audio_codec))) {
-        printf("    Default audio codec: %s.\n", desc->name);
-    }
-    if (fmt->subtitle_codec != AV_CODEC_ID_NONE &&
-        (desc = avcodec_descriptor_get(fmt->subtitle_codec))) {
-        printf("    Default subtitle codec: %s.\n", desc->name);
-    }
-
-    if (fmt->priv_class)
-        show_help_children(fmt->priv_class, AV_OPT_FLAG_ENCODING_PARAM);
-}
-
-#if CONFIG_AVFILTER
-static void show_help_filter(const char *name)
-{
-    const AVFilter *f = avfilter_get_by_name(name);
-    int i, count;
-
-    if (!name) {
-        av_log(NULL, AV_LOG_ERROR, "No filter name specified.\n");
-        return;
-    } else if (!f) {
-        av_log(NULL, AV_LOG_ERROR, "Unknown filter '%s'.\n", name);
-        return;
-    }
-
-    printf("Filter %s [%s]:\n", f->name, f->description);
-
-    if (f->flags & AVFILTER_FLAG_SLICE_THREADS)
-        printf("    slice threading supported\n");
-
-    printf("    Inputs:\n");
-    count = avfilter_pad_count(f->inputs);
-    for (i = 0; i < count; i++) {
-        printf("        %d %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),
-               media_type_string(avfilter_pad_get_type(f->inputs, i)));
-    }
-    if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
-        printf("        dynamic (depending on the options)\n");
-
-    printf("    Outputs:\n");
-    count = avfilter_pad_count(f->outputs);
-    for (i = 0; i < count; i++) {
-        printf("        %d %s (%s)\n", i, avfilter_pad_get_name(f->outputs, i),
-               media_type_string(avfilter_pad_get_type(f->outputs, i)));
-    }
-    if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
-        printf("        dynamic (depending on the options)\n");
-
-    if (f->priv_class)
-        show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM |
-                                          AV_OPT_FLAG_AUDIO_PARAM);
-}
-#endif
-
-int show_help(void *optctx, const char *opt, const char *arg)
-{
-    char *topic, *par;
-    av_log_set_callback(log_callback_help);
-
-    topic = av_strdup(arg ? arg : "");
-    if (!topic)
-        return AVERROR(ENOMEM);
-    par = strchr(topic, '=');
-    if (par)
-        *par++ = 0;
-
-    if (!*topic) {
-        show_help_default(topic, par);
-    } else if (!strcmp(topic, "decoder")) {
-        show_help_codec(par, 0);
-    } else if (!strcmp(topic, "encoder")) {
-        show_help_codec(par, 1);
-    } else if (!strcmp(topic, "demuxer")) {
-        show_help_demuxer(par);
-    } else if (!strcmp(topic, "muxer")) {
-        show_help_muxer(par);
-#if CONFIG_AVFILTER
-    } else if (!strcmp(topic, "filter")) {
-        show_help_filter(par);
-#endif
-    } else {
-        show_help_default(topic, par);
-    }
-
-    av_freep(&topic);
-    return 0;
-}
-
-int read_yesno(void)
-{
-    int c = getchar();
-    int yesno = (av_toupper(c) == 'Y');
-
-    while (c != '\n' && c != EOF)
-        c = getchar();
-
-    return yesno;
-}
-
-void init_pts_correction(PtsCorrectionContext *ctx)
-{
-    ctx->num_faulty_pts = ctx->num_faulty_dts = 0;
-    ctx->last_pts = ctx->last_dts = INT64_MIN;
-}
-
-int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t reordered_pts,
-                          int64_t dts)
-{
-    int64_t pts = AV_NOPTS_VALUE;
-
-    if (dts != AV_NOPTS_VALUE) {
-        ctx->num_faulty_dts += dts <= ctx->last_dts;
-        ctx->last_dts = dts;
-    }
-    if (reordered_pts != AV_NOPTS_VALUE) {
-        ctx->num_faulty_pts += reordered_pts <= ctx->last_pts;
-        ctx->last_pts = reordered_pts;
-    }
-    if ((ctx->num_faulty_pts<=ctx->num_faulty_dts || dts == AV_NOPTS_VALUE)
-        && reordered_pts != AV_NOPTS_VALUE)
-        pts = reordered_pts;
-    else
-        pts = dts;
-
-    return pts;
-}
-
-FILE *get_preset_file(char *filename, size_t filename_size,
-                      const char *preset_name, int is_path,
-                      const char *codec_name)
-{
-    FILE *f = NULL;
-    int i;
-    const char *base[3] = { getenv("AVCONV_DATADIR"),
-                            getenv("HOME"),
-                            AVCONV_DATADIR, };
-
-    if (is_path) {
-        av_strlcpy(filename, preset_name, filename_size);
-        f = fopen(filename, "r");
-    } else {
-        for (i = 0; i < 3 && !f; i++) {
-            if (!base[i])
-                continue;
-            snprintf(filename, filename_size, "%s%s/%s.avpreset", base[i],
-                     i != 1 ? "" : "/.avconv", preset_name);
-            f = fopen(filename, "r");
-            if (!f && codec_name) {
-                snprintf(filename, filename_size,
-                         "%s%s/%s-%s.avpreset",
-                         base[i], i != 1 ? "" : "/.avconv", codec_name,
-                         preset_name);
-                f = fopen(filename, "r");
-            }
-        }
-    }
-
-    return f;
-}
-
-int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec)
-{
-    if (*spec <= '9' && *spec >= '0') /* opt:index */
-        return strtol(spec, NULL, 0) == st->index;
-    else if (*spec == 'v' || *spec == 'a' || *spec == 's' || *spec == 'd' ||
-             *spec == 't') { /* opt:[vasdt] */
-        enum AVMediaType type;
-
-        switch (*spec++) {
-        case 'v': type = AVMEDIA_TYPE_VIDEO;      break;
-        case 'a': type = AVMEDIA_TYPE_AUDIO;      break;
-        case 's': type = AVMEDIA_TYPE_SUBTITLE;   break;
-        case 'd': type = AVMEDIA_TYPE_DATA;       break;
-        case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
-        default:  av_assert0(0);
-        }
-        if (type != st->codecpar->codec_type)
-            return 0;
-        if (*spec++ == ':') { /* possibly followed by :index */
-            int i, index = strtol(spec, NULL, 0);
-            for (i = 0; i < s->nb_streams; i++)
-                if (s->streams[i]->codecpar->codec_type == type && index-- == 0)
-                   return i == st->index;
-            return 0;
-        }
-        return 1;
-    } else if (*spec == 'p' && *(spec + 1) == ':') {
-        int prog_id, i, j;
-        char *endptr;
-        spec += 2;
-        prog_id = strtol(spec, &endptr, 0);
-        for (i = 0; i < s->nb_programs; i++) {
-            if (s->programs[i]->id != prog_id)
-                continue;
-
-            if (*endptr++ == ':') {
-                int stream_idx = strtol(endptr, NULL, 0);
-                return stream_idx >= 0 &&
-                    stream_idx < s->programs[i]->nb_stream_indexes &&
-                    st->index == s->programs[i]->stream_index[stream_idx];
-            }
-
-            for (j = 0; j < s->programs[i]->nb_stream_indexes; j++)
-                if (st->index == s->programs[i]->stream_index[j])
-                    return 1;
-        }
-        return 0;
-    } else if (*spec == 'i' && *(spec + 1) == ':') {
-        int stream_id;
-        char *endptr;
-        spec += 2;
-        stream_id = strtol(spec, &endptr, 0);
-        return stream_id == st->id;
-    } else if (*spec == 'm' && *(spec + 1) == ':') {
-        AVDictionaryEntry *tag;
-        char *key, *val;
-        int ret;
-
-        spec += 2;
-        val = strchr(spec, ':');
-
-        key = val ? av_strndup(spec, val - spec) : av_strdup(spec);
-        if (!key)
-            return AVERROR(ENOMEM);
-
-        tag = av_dict_get(st->metadata, key, NULL, 0);
-        if (tag) {
-            if (!val || !strcmp(tag->value, val + 1))
-                ret = 1;
-            else
-                ret = 0;
-        } else
-            ret = 0;
-
-        av_freep(&key);
-        return ret;
-    } else if (*spec == 'u') {
-        AVCodecParameters *par = st->codecpar;
-        int val;
-        switch (par->codec_type) {
-        case AVMEDIA_TYPE_AUDIO:
-            val = par->sample_rate && par->channels;
-            if (par->format == AV_SAMPLE_FMT_NONE)
-                return 0;
-            break;
-        case AVMEDIA_TYPE_VIDEO:
-            val = par->width && par->height;
-            if (par->format == AV_PIX_FMT_NONE)
-                return 0;
-            break;
-        case AVMEDIA_TYPE_UNKNOWN:
-            val = 0;
-            break;
-        default:
-            val = 1;
-            break;
-        }
-        return par->codec_id != AV_CODEC_ID_NONE && val != 0;
-    } else if (!*spec) /* empty specifier, matches everything */
-        return 1;
-
-    av_log(s, AV_LOG_ERROR, "Invalid stream specifier: %s.\n", spec);
-    return AVERROR(EINVAL);
-}
-
-AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
-                                AVFormatContext *s, AVStream *st, AVCodec *codec)
-{
-    AVDictionary    *ret = NULL;
-    AVDictionaryEntry *t = NULL;
-    int            flags = s->oformat ? AV_OPT_FLAG_ENCODING_PARAM
-                                      : AV_OPT_FLAG_DECODING_PARAM;
-    char          prefix = 0;
-    const AVClass    *cc = avcodec_get_class();
-
-    if (!codec)
-        codec            = s->oformat ? avcodec_find_encoder(codec_id)
-                                      : avcodec_find_decoder(codec_id);
-
-    switch (st->codecpar->codec_type) {
-    case AVMEDIA_TYPE_VIDEO:
-        prefix  = 'v';
-        flags  |= AV_OPT_FLAG_VIDEO_PARAM;
-        break;
-    case AVMEDIA_TYPE_AUDIO:
-        prefix  = 'a';
-        flags  |= AV_OPT_FLAG_AUDIO_PARAM;
-        break;
-    case AVMEDIA_TYPE_SUBTITLE:
-        prefix  = 's';
-        flags  |= AV_OPT_FLAG_SUBTITLE_PARAM;
-        break;
-    }
-
-    while (t = av_dict_get(opts, "", t, AV_DICT_IGNORE_SUFFIX)) {
-        char *p = strchr(t->key, ':');
-
-        /* check stream specification in opt name */
-        if (p)
-            switch (check_stream_specifier(s, st, p + 1)) {
-            case  1: *p = 0; break;
-            case  0:         continue;
-            default:         return NULL;
-            }
-
-        if (av_opt_find(&cc, t->key, NULL, flags, AV_OPT_SEARCH_FAKE_OBJ) ||
-            (codec && codec->priv_class &&
-             av_opt_find(&codec->priv_class, t->key, NULL, flags,
-                         AV_OPT_SEARCH_FAKE_OBJ)))
-            av_dict_set(&ret, t->key, t->value, 0);
-        else if (t->key[0] == prefix &&
-                 av_opt_find(&cc, t->key + 1, NULL, flags,
-                             AV_OPT_SEARCH_FAKE_OBJ))
-            av_dict_set(&ret, t->key + 1, t->value, 0);
-
-        if (p)
-            *p = ':';
-    }
-    return ret;
-}
-
-AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
-                                           AVDictionary *codec_opts)
-{
-    int i;
-    AVDictionary **opts;
-
-    if (!s->nb_streams)
-        return NULL;
-    opts = av_mallocz(s->nb_streams * sizeof(*opts));
-    if (!opts) {
-        av_log(NULL, AV_LOG_ERROR,
-               "Could not alloc memory for stream options.\n");
-        return NULL;
-    }
-    for (i = 0; i < s->nb_streams; i++)
-        opts[i] = filter_codec_opts(codec_opts, s->streams[i]->codecpar->codec_id,
-                                    s, s->streams[i], NULL);
-    return opts;
-}
-
-void *grow_array(void *array, int elem_size, int *size, int new_size)
-{
-    if (new_size >= INT_MAX / elem_size) {
-        av_log(NULL, AV_LOG_ERROR, "Array too big.\n");
-        exit_program(1);
-    }
-    if (*size < new_size) {
-        uint8_t *tmp = av_realloc(array, new_size*elem_size);
-        if (!tmp) {
-            av_log(NULL, AV_LOG_ERROR, "Could not alloc buffer.\n");
-            exit_program(1);
-        }
-        memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);
-        *size = new_size;
-        return tmp;
-    }
-    return array;
-}
-
-const char *media_type_string(enum AVMediaType media_type)
-{
-    switch (media_type) {
-    case AVMEDIA_TYPE_VIDEO:      return "video";
-    case AVMEDIA_TYPE_AUDIO:      return "audio";
-    case AVMEDIA_TYPE_DATA:       return "data";
-    case AVMEDIA_TYPE_SUBTITLE:   return "subtitle";
-    case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
-    default:                      return "unknown";
-    }
-}