[FFmpeg-trac] #5743(undetermined:new): SAR changes when stream copying y4m video to Matroska when SAR is present in source
FFmpeg
trac at avcodec.org
Thu Jul 28 11:52:02 EEST 2016
#5743: SAR changes when stream copying y4m video to Matroska when SAR is present
in source
-------------------------------------+-------------------------------------
Reporter: kieranjol | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: matroska, | Blocked By:
y4m, SAR, DAR | Reproduced by developer: 0
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug: Y4m videos that are stream copied to Matroska can have
a different SAR.
Input.y4m = Video: rawvideo (I420 / 0x30323449), yuv420p,
176x144, SAR 128:117 DAR 1408:1053
Out.mkv = Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p,
176x144, SAR 193:176 DAR 193:144
Raised on ffmpeg-user, Carl Eugen Hoyos asked me to file a ticket:
https://lists.ffmpeg.org/pipermail/ffmpeg-user/2016-July/032774.html
How to reproduce: Source can be downloaded from here
https://media.xiph.org/video/derf/y4m/bus_qcif_15fps.y4m
{{{
% ffmpeg -i bus_qcif_15fps.y4m -c copy out.mkv
ffmpeg version N-44317-g7af44ce Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration:
--prefix=/home/kieranjol/.linuxbrew/Cellar/ffmpeg/HEAD --enable-shared
--enable-pthreads --enable-gpl --enable-version3
--enable-hardcoded-tables --enable-avresample --cc=/usr/bin/gcc-4.8
--host-cflags='-Os -w -pipe -march=core2'
--host-ldflags='-L/home/kieranjol/.linuxbrew/lib
-Wl,--dynamic-linker=/home/kieranjol/.linuxbrew/lib/ld.so
-Wl,-rpath,/home/kieranjol/.linuxbrew/lib' --enable-libx264
--enable-libmp3lame --enable-libxvid --enable-vda
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 50.100 / 57. 50.100
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 47.100 / 6. 47.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, yuv4mpegpipe, from 'bus_qcif_15fps.y4m':
Duration: 00:00:05.00, start: 0.000000, bitrate: 4562 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p,
176x144, SAR 128:117 DAR 1408:1053, 15 fps, 15 tbr, 15 tbn, 15 tbc
File 'out.mkv' already exists. Overwrite ? [y/N] y
[matroska @ 0x21ba860] Using AVStream.codec to pass codec parameters
to muxers is deprecated, use AVStream.codecpar instead.
Output #0, matroska, to 'out.mkv':
Metadata:
encoder : Lavf57.41.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 176x144
[SAR 128:117 DAR 1408:1053], q=2-31, 15 fps, 15 tbr, 1k tbn, 15 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 75 fps=0.0 q=-1.0 Lsize= 2788kB time=00:00:04.93
bitrate=4629.1kbits/s speed= 115x
video:2784kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.134154%
2.
ffmpeg -i out.mkv
ffmpeg version N-44317-g7af44ce Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration:
--prefix=/home/kieranjol/.linuxbrew/Cellar/ffmpeg/HEAD --enable-shared
--enable-pthreads --enable-gpl --enable-version3
--enable-hardcoded-tables --enable-avresample --cc=/usr/bin/gcc-4.8
--host-cflags='-Os -w -pipe -march=core2'
--host-ldflags='-L/home/kieranjol/.linuxbrew/lib
-Wl,--dynamic-linker=/home/kieranjol/.linuxbrew/lib/ld.so
-Wl,-rpath,/home/kieranjol/.linuxbrew/lib' --enable-libx264
--enable-libmp3lame --enable-libxvid --enable-vda
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 50.100 / 57. 50.100
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 47.100 / 6. 47.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, matroska,webm, from 'out.mkv':
Metadata:
ENCODER : Lavf57.41.100
Duration: 00:00:05.00, start: 0.000000, bitrate: 4568 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p,
176x144, SAR 193:176 DAR 193:144, 15 fps, 15 tbr, 1k tbn, 1k tbc
(default)
Metadata:
DURATION : 00:00:05.000000000
At least one output file must be specified
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5743>
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