[FFmpeg-trac] #2875(avformat:new): ffmpeg changes stream order from input to output
FFmpeg
trac at avcodec.org
Fri Aug 16 16:08:17 CEST 2013
#2875: ffmpeg changes stream order from input to output
-------------------------------------+-------------------------------------
Reporter: kadmandux | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git-
Keywords: stream | master
order | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
I'm extracting some fragments from an mpeg file, to join them afterwards.
The problem is that ffmpeg sometimes changes the order of the audio and
video streams (video was the first stream and, sometimes, the file
produced by ffmeg has audio as the first stream), and this makes more
difficult to join the files, because of this:
http://trac.ffmpeg.org/ticket/2873
{{{
ffprobe M2U00135.mpg
Input #0, mpeg, from 'M2U00135.mpg':
Duration: 00:03:44.61, start: 0.108467, bitrate: 7840 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], max. 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
}}}
How to reproduce:
{{{
% ffmpeg -ss 10 -i M2U00135.mpg -c:v copy -c:a copy -t 40 v1.mpg
ffmpeg version N-55393-g3b2e99f Copyright (c) 2000-2013 the FFmpeg
developers
built on Aug 8 2013 21:32:57 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
--enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-
libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
--ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-
libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-
libxavs --
enable-libxvid --enable-zlib
libavutil 52. 41.100 / 52. 41.100
libavcodec 55. 24.100 / 55. 24.100
libavformat 55. 13.102 / 55. 13.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 82.100 / 3. 82.100
libswscale 2. 4.100 / 2. 4.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
Input #0, mpeg, from 'M2U00135.mpg':
Duration: 00:03:44.61, start: 0.108467, bitrate: 7840 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], max. 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Output #0, mpeg, to 'v1.mpg':
Metadata:
encoder : Lavf55.13.102
Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 64:45 DAR 16:9],
q=2-31, max. 9100 kb/s, 25 fps, 90k tbn, 25 tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 23 fps=0.0 q=-1.0 size= 794kB time=00:00:00.96
bitrate=6775.5kbits/
frame= 60 fps= 59 q=-1.0 size= 2126kB time=00:00:02.44
bitrate=7137.8kbits/
.....
% ffmpeg -ss 00:01:35 -i M2U00135.mpg -c:v copy -c:a copy -to 00:03:45
-nostats v2.mpg
ffmpeg version N-55393-g3b2e99f Copyright (c) 2000-2013 the FFmpeg
developers
built on Aug 8 2013 21:32:57 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
--enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-
libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
--ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-
libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-
libxavs --
enable-libxvid --enable-zlib
libavutil 52. 41.100 / 52. 41.100
libavcodec 55. 24.100 / 55. 24.100
libavformat 55. 13.102 / 55. 13.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 82.100 / 3. 82.100
libswscale 2. 4.100 / 2. 4.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
Input #0, mpeg, from 'M2U00135.mpg':
Duration: 00:03:44.61, start: 0.108467, bitrate: 7840 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], max. 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Output #0, mpeg, to 'v2.mpg':
Metadata:
encoder : Lavf55.13.102
Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 64:45 DAR 16:9],
q=2-31, max. 9100 kb/s, 25 fps, 90k tbn, 25 tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 3240 fps=155 q=-1.0 Lsize= 120176kB time=00:02:09.64
bitrate=7594.0kbits/s
video:115639kB audio:4058kB subtitle:0 global headers:0kB muxing overhead
0.399988%
% ffprobe v1.mpg
Input #0, mpeg, from 'v1.mpg':
Duration: 00:00:40.14, start: 0.500000, bitrate: 7713 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], max. 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
% ffprobe v2.mpg
Input #0, mpeg, from 'v2.mpg':
Duration: 00:02:09.82, start: 0.500000, bitrate: 7583 kb/s
Stream #0:0[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], max. 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
}}}
The file v1.mpg has the same stream order than the original file, but
v2.mpg has the stream orden changed.
And it is interesting to see that the ffmpeg console output said that the
stream order for this file was the same that had the original file:
{{{
Input #0, mpeg, from 'M2U00135.mpg':
Duration: 00:03:44.61, start: 0.108467, bitrate: 7840 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], max. 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Output #0, mpeg, to 'v2.mpg':
Metadata:
encoder : Lavf55.13.102
Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 64:45 DAR 16:9],
q=2-31, max. 9100 kb/s, 25 fps, 90k tbn, 25 tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2875>
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