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MicroDVD files are normally frame-based (i.e. there are no absolute
timestamps), but can have an optional frame rate header. If this
header is missing, the timestamps depend on the frame rate of the
video they were created for.
The demuxer will use a fallback frame rate if it's missing from the
header. Currently, applications using libavformat can't know whether
the time base is based on the fallback value, or if a frame rate
header was present.
This commit introduces a subfps AVOption for MicroDVD, and the
demuxer sets it if and only if a frame rate header was present.
Signed-off-by: Clément Bœsch <u@pkh.me>
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The BOM is already skipped in the probe function, but not the header
read function. This could cause the header to be misparsed, such as
not interpreting the FPS line.
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This fixes a bunch of possible overread in avformat with the idiom p +=
strcspn(p, "\n") + 1 (strcspn() can focus on the trailing '\0' if no
'\n' is found, so the +1 leads to an overread).
Note on lavf/matroskaenc: no extra subtitles.o Makefile dependency is
added because only the header is required for ff_subtitles_next_line().
Note on lavf/mpsubdec: code gets slightly complex to avoid an infinite
loop in the probing since there is no more forced increment.
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This flag is not necessary.
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Current MicroDVD AVPackets contain timing information and trailing line
breaks. The data is now only composed of the markup data. Doing this
consistently between text subtitles decoders allows to use different
codec for various formats. For instance, MicroDVD markup is sometimes
found in some VPlayer files. Also, generally speaking, the subtitles
text decoders have no use of these timings (and they must not use them
since it would break any user timing adjustment).
Technically, this is a major ABI break. In practice, a mismatching
lavf/lavc will now error out for MicroDVD decoding. Supporting both
formats requires unnecessary complex and fragile code.
FATE needs update because line breaks in the ASS file were "\n" (because
that's what is used in the original file). ASS format expect "\r\n" line
breaks; this commit fixes this issue. Also note that this "\r\n"
trailing need to be moved at some point from the decoders to the ASS
muxer.
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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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* commit '36ef5369ee9b336febc2c270f8718cec4476cb85':
Replace all CODEC_ID_* with AV_CODEC_ID_*
lavc: add AV prefix to codec ids.
Conflicts:
doc/APIchanges
doc/examples/decoding_encoding.c
doc/examples/muxing.c
ffmpeg.c
ffprobe.c
ffserver.c
libavcodec/8svx.c
libavcodec/avcodec.h
libavcodec/dnxhd_parser.c
libavcodec/dvdsubdec.c
libavcodec/error_resilience.c
libavcodec/h263dec.c
libavcodec/libvorbisenc.c
libavcodec/mjpeg_parser.c
libavcodec/mjpegenc.c
libavcodec/mpeg12.c
libavcodec/mpeg4videodec.c
libavcodec/mpegvideo.c
libavcodec/mpegvideo_enc.c
libavcodec/pcm.c
libavcodec/r210dec.c
libavcodec/utils.c
libavcodec/v210dec.c
libavcodec/version.h
libavdevice/alsa-audio-dec.c
libavdevice/bktr.c
libavdevice/v4l2.c
libavformat/asfdec.c
libavformat/asfenc.c
libavformat/avformat.h
libavformat/avidec.c
libavformat/caf.c
libavformat/electronicarts.c
libavformat/flacdec.c
libavformat/flvdec.c
libavformat/flvenc.c
libavformat/framecrcenc.c
libavformat/img2.c
libavformat/img2dec.c
libavformat/img2enc.c
libavformat/ipmovie.c
libavformat/isom.c
libavformat/matroska.c
libavformat/matroskadec.c
libavformat/matroskaenc.c
libavformat/mov.c
libavformat/movenc.c
libavformat/mp3dec.c
libavformat/mpeg.c
libavformat/mpegts.c
libavformat/mxf.c
libavformat/mxfdec.c
libavformat/mxfenc.c
libavformat/nsvdec.c
libavformat/nut.c
libavformat/oggenc.c
libavformat/pmpdec.c
libavformat/rawdec.c
libavformat/rawenc.c
libavformat/riff.c
libavformat/sdp.c
libavformat/utils.c
libavformat/vocenc.c
libavformat/wtv.c
libavformat/xmv.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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Example:
{3350}{}this subtitle...
{3390}{}...continues up to...
{4000}{4500}this one.
{4600}{}and now...
{4800}{}...to the end of the presentation
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* qatar/master: (71 commits)
movenc: Allow writing to a non-seekable output if using empty moov
movenc: Support adding isml (smooth streaming live) metadata
libavcodec: Don't crash in avcodec_encode_audio if time_base isn't set
sunrast: Document the different Sun Raster file format types.
sunrast: Add a check for experimental type.
libspeexenc: use AVSampleFormat instead of deprecated/removed SampleFormat
lavf: remove disabled FF_API_SET_PTS_INFO cruft
lavf: remove disabled FF_API_OLD_INTERRUPT_CB cruft
lavf: remove disabled FF_API_REORDER_PRIVATE cruft
lavf: remove disabled FF_API_SEEK_PUBLIC cruft
lavf: remove disabled FF_API_STREAM_COPY cruft
lavf: remove disabled FF_API_PRELOAD cruft
lavf: remove disabled FF_API_NEW_STREAM cruft
lavf: remove disabled FF_API_RTSP_URL_OPTIONS cruft
lavf: remove disabled FF_API_MUXRATE cruft
lavf: remove disabled FF_API_FILESIZE cruft
lavf: remove disabled FF_API_TIMESTAMP cruft
lavf: remove disabled FF_API_LOOP_OUTPUT cruft
lavf: remove disabled FF_API_LOOP_INPUT cruft
lavf: remove disabled FF_API_AVSTREAM_QUALITY cruft
...
Conflicts:
doc/APIchanges
libavcodec/8bps.c
libavcodec/avcodec.h
libavcodec/libx264.c
libavcodec/mjpegbdec.c
libavcodec/options.c
libavcodec/sunrast.c
libavcodec/utils.c
libavcodec/version.h
libavcodec/x86/h264_deblock.asm
libavdevice/libdc1394.c
libavdevice/v4l2.c
libavformat/avformat.h
libavformat/avio.c
libavformat/avio.h
libavformat/aviobuf.c
libavformat/dv.c
libavformat/mov.c
libavformat/utils.c
libavformat/version.h
libavformat/wtv.c
libavutil/Makefile
libavutil/file.c
libswscale/x86/input.asm
libswscale/x86/swscale_mmx.c
libswscale/x86/swscale_template.c
tests/ref/lavf/ffm
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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Signed-off-by: Aurelien Jacobs <aurel@gnuage.org>
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