From 1b58d58ddaf8a8c766a0353885ff504babed0453 Mon Sep 17 00:00:00 2001 From: Fabrice Bellard Date: Thu, 19 Jul 2001 20:46:37 +0000 Subject: removing old files Originally committed as revision 4 to svn://svn.ffmpeg.org/ffmpeg/trunk --- doc/ffmpeg.txt | 62 ---------------------------------------------------------- 1 file changed, 62 deletions(-) delete mode 100644 doc/ffmpeg.txt (limited to 'doc/ffmpeg.txt') diff --git a/doc/ffmpeg.txt b/doc/ffmpeg.txt deleted file mode 100644 index b7fffcdd29..0000000000 --- a/doc/ffmpeg.txt +++ /dev/null @@ -1,62 +0,0 @@ -* ffmpeg can use YUV files as input : - - ffmpeg /tmp/out.mpg /tmp/test - -If will use the files: -/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V, -/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc... - -The Y files use twice the resolution of the U and V files. They are -raw files, without header. They can be generated by all decent video -decoders. - -* ffmpeg can use a video4linux compatible video source : - - ffmpeg /tmp/out.mpg - - Note that you must activate the right video source and channel - before launching ffmpeg. You can use any TV viewer such as xawtv by - Gerd Knorr which I find very good. - -* There are some importants options to know: - --s size set frame size [160x128] --f format set encoding format [mpeg1] --r fps set frame rate [25] --b bitrate set the bitrate in kbit/s [100] --t time set recording time in seconds [10.0] - -The frame size can also be: cif, qcif, sqcif and 4cif. -The encoding format can be mpeg1, h263 or rv10. - -Advanced options are: - --d device set video4linux device name --g gop_size set the group of picture size. - An 'intra' frame is generated every gop_size frames. --i use only intra images (speed up compression, but lower quality). --c comment set the comment string. - -Comment strings are only used for Real Video(tm) encoding. Tags are -used in the comment string. A typical comment string is: - -"+title=Test Video +author=FFMpeg +copyright=Free +comment=Generated by FFMpeg 1.0" - -The output file can be "-" to output to a pipe. This is only possible -with mpeg1 and h263 formats. - -* Tips: - -- For low bit rate application, use a low frame rate and a small gop - size. This is especially true for real video where the Linux player - does not seem to be very fast, so it can miss frames. An example is: - - ffmpeg -g 3 -r 3 -t 10 -b 50 -s qcif -f rv10 /tmp/b.rm - -- The parameter 'q' which is displayed while encoding is the current - quantizer. The value of 1 indicates that a very good quality could - be achieved. The value of 31 indicates the worst quality. If q=31 - too often, it means that the encoder cannot compress enough to meet - your bit rate. You must either increase the bit rate, decrease the - frame rate or decrease the frame size. - -- cgit v1.2.3