File produced ffmpeg by stream copy reports audio (AAC) for the stream that should be video (MPEG2)

[gyhrvy]

Summary of the bug:
I'm attempting a partial stream copy of the file "Alcorn McBride PAL Test Clip (SD)" vid00003.mpg
Available here: ​http://alcorn.com/test-files/

The source file shows these streams, with the AAC one that I'm not expecting, and no video stream:

stream,0,mpeg2video,MPEG-2 video,Main,video,1/25
stream,1,mp2,MP2 (MPEG audio layer 2),unknown,audio,1/44100

Copying the streams with a cut ffmpeg.exe -i vid00003.mpg -ss 00:00:10 -c:v copy -c:a copy vid00003_cut.mpg gives these streams:

stream,0,mp2,MP2 (MPEG audio layer 2),unknown,audio,1/44100
stream,1,aac,AAC (Advanced Audio Coding),SSR,audio,1/24000

Copying the streams without the cut ffmpeg.exe -i vid00003.mpg -c:v copy -c:a copy vid00003_nocut.mpg works fine.

How to reproduce:

% ffmpeg.exe -i vid00003.mpg -ss 00:00:10 -c:v copy -c:a copy vid00003_cut.mpg

ffmpeg version is from zeranoe.com, dated 2016-07-28, git fb91143

ffmpeg version N-81154-gfb91143 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.4.0 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3
 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avi
synth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --e
nable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --ena
ble-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --
enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-l
ibx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --ena
ble-lzma --enable-decklink --enable-zlib
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 51.100 / 57. 51.100
  libavformat    57. 44.100 / 57. 44.100
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 49.100 /  6. 49.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[Carl Eugen Hoyos]

For future tickets, please remember to always provide both the command line you tested and the complete, uncut console output.

$ ffmpeg -i vid00003_cut.mpg -vcodec copy -an -ss 1 out.vob
ffmpeg version N-81219-g8ee113a Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 51.100 / 57. 51.100
  libavformat    57. 44.100 / 57. 44.100
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 49.100 /  6. 49.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mpeg, from 'vid00003_cut.mpg':
  Duration: 00:00:02.44, start: 0.384444, bitrate: 8393 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg), 720x576 [SAR 16:15 DAR 4:3], 7680 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s
[svcd @ 0x3394c80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[svcd @ 0x3394c80] VBV buffer size not set, using default size of 130KB
If you want the mpeg file to be compliant to some specification
Like DVD, VCD or others, make sure you set the correct buffer size
Output #0, svcd, to 'out.vob':
  Metadata:
    encoder         : Lavf57.44.100
    Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, bt470bg), 720x576 [SAR 16:15 DAR 4:3], q=2-31, 7680 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=   25 fps=0.0 q=-1.0 Lsize=    1018kB time=00:00:01.28 bitrate=6515.1kbits/s speed= 251x  
video:1003kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.452841%

$ ffmpeg -i out.vob
ffmpeg version N-81219-g8ee113a Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 51.100 / 57. 51.100
  libavformat    57. 44.100 / 57. 44.100
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 49.100 /  6. 49.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100
[mp3 @ 0x35ddd00] Header missing
    Last message repeated 406 times
[mpeg @ 0x35dc280] decoding for stream 0 failed
[mpeg @ 0x35dc280] Could not find codec parameters for stream 0 (Audio: mp3, 0 channels, s16p): unspecified frame size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mpeg, from 'out.vob':
  Duration: 00:00:00.96, start: 0.620000, bitrate: 8686 kb/s
    Stream #0:0[0x1e0]: Audio: mp3, 0 channels, s16p
At least one output file must be specified