Stream mapping: unable to set Video like first stream in output file (mpeg)

[kadmandux]

Summary of the bug:
I'm having problems with stream ordering in mpeg files, as you can see here:

​http://trac.ffmpeg.org/ticket/2875

I've found some problems to recover the original stream order, because ffmpeg don't generates the stream order I'm asking for.

These are the two original files. Look at stream order:

% 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

I'm going to try to reverse the order of the streams in both files.

How to reproduce:

% ffmpeg -i v1.mpg -c:a copy -c:v copy -nostats -map 0:1 -map 0:0 v11.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 '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
Output #0, mpeg, to 'v11.mpg':
  Metadata:
    encoder         : Lavf55.13.102
    Stream #0:0: Audio: ac3, 48000 Hz, stereo, 256 kb/s
    Stream #0:1: Video: mpeg2video, yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, max. 9100 kb/s, 25 fps, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  999 fps=533 q=-1.0 Lsize=   37800kB time=00:00:40.16 bitrate=7710.6kbits/s
video:36393kB audio:1255kB subtitle:0 global headers:0kB muxing overhead 0.403831%



% ffmpeg -i v2.mpg -c:a copy -c:v copy -nostats -map 0:1 -map 0:0 v22.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 '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
Output #0, mpeg, to 'v22.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 #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 3240 fps=324 q=-1.0 Lsize=  120176kB time=00:02:09.85 bitrate=7581.3kbits/s
video:115639kB audio:4058kB subtitle:0 global headers:0kB muxing overhead 0.399988%

The results are different than expected: v11.mpg has changed the stream order of v1.mpg, but v22.mpg has the same stream order than v2.mpg:

% ffprobe v11.mpg
Input #0, mpeg, from 'v11.mpg':
  Duration: 00:00:40.14, start: 0.500000, bitrate: 7713 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

% ffprobe v22.mpg
Input #0, mpeg, from 'v22.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

[Michael Niedermayer]

There is no stream order in mpeg-ps.
what you see from ffmpeg output order is likely just if a audio or video packet comes first