[FFmpeg-trac] #7372(avcodec:new): [regression][eac3] Unable to parse channels information while compiling with ac3 decoder disabled.

[FFmpeg]

#7372: [regression][eac3] Unable to parse channels information while compiling
with ac3 decoder disabled.
-----------------------------------+--------------------------------------
             Reporter:  apasyniuk  |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  avcodec    |                  Version:  git-master
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
-----------------------------------+--------------------------------------
 Summary of the bug:
 When ffmpeg is compiled with ac3 decoder disabled ffmpeg is unable to
 extract channel information from ts file.

 It can be a regression after a changes introduced in:
 ae9297097696f3d06417a6e8a5368d5f38a6edb4

 How to reproduce:
 Before ae9297097696f3d06417a6e8a5368d5f38a6edb4 commit:
 {{{
 > $ ./ffprobe -i ~/builds/ts_multi_codec.ts
 [±e5819fa629]
 ffprobe version N-90480-ge5819fa629 Copyright (c) 2007-2018 the FFmpeg
 developers
   built with gcc 5.5.0 (Ubuntu 5.5.0-12ubuntu1~16.04) 20171010
   configuration: --prefix=/home/apasyniuk/ffmpeg_build --pkg-config-
 flags=--static --extra-cflags=-I/home/apasyniuk/ffmpeg_build/include
 --extra-ldflags=-L/home/apasyniuk/ffmpeg_build/lib --extra-libs='-lpthread
 -lm' --bindir=/home/apasyniuk/bin --disable-decoder=ac3
   libavutil      56. 12.100 / 56. 12.100
   libavcodec     58. 16.100 / 58. 16.100
   libavformat    58. 10.100 / 58. 10.100
   libavdevice    58.  2.100 / 58.  2.100
   libavfilter     7. 13.100 /  7. 13.100
   libswscale      5.  0.102 /  5.  0.102
   libswresample   3.  0.101 /  3.  0.101
 [mpegts @ 0x2722b00] DTS discontinuity in stream 0: packet 3 with DTS
 123306, packet 4 with DTS 126906
 Input #0, mpegts, from '/home/apasyniuk/builds/ts_multi_codec.ts':
   Duration: 00:01:21.02, start: 1.370067, bitrate: 4749 kb/s
   Program 2
     Stream #0:0[0x21]: Video: h264 (High) ([27][0][0][0] / 0x001B),
 yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25
 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x24]: Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz,
 5.1(side), 192 kb/s
     Stream #0:2[0x25]: Audio: aac (LC) ([17][0][0][0] / 0x0011), 48000 Hz,
 stereo, fltp, 128 kb/s
 }}}

 {{{
 Stream #0:1[0x24]: Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz,
 5.1(side), 192 kb/s
 }}}
 ffprobe is able to extract information about channels 5.1

 after ae9297097696f3d06417a6e8a5368d5f38a6edb4 commit:
 {{{
 > $ ./ffprobe -i ~/builds/ts_multi_codec.ts
 [±ae92970976]
 ffprobe version N-90481-gae92970976 Copyright (c) 2007-2018 the FFmpeg
 developers
   built with gcc 5.5.0 (Ubuntu 5.5.0-12ubuntu1~16.04) 20171010
   configuration: --prefix=/home/apasyniuk/ffmpeg_build --pkg-config-
 flags=--static --extra-cflags=-I/home/apasyniuk/ffmpeg_build/include
 --extra-ldflags=-L/home/apasyniuk/ffmpeg_build/lib --extra-libs='-lpthread
 -lm' --bindir=/home/apasyniuk/bin --disable-decoder=ac3
   libavutil      56. 12.100 / 56. 12.100
   libavcodec     58. 16.100 / 58. 16.100
   libavformat    58. 10.100 / 58. 10.100
   libavdevice    58.  2.100 / 58.  2.100
   libavfilter     7. 13.100 /  7. 13.100
   libswscale      5.  0.102 /  5.  0.102
   libswresample   3.  0.101 /  3.  0.101
 [mpegts @ 0x3715b00] DTS discontinuity in stream 0: packet 3 with DTS
 123306, packet 4 with DTS 126906
 [mpegts @ 0x3715b00] Could not find codec parameters for stream 1 (Audio:
 eac3 ([6][0][0][0] / 0x0006), 48000 Hz, 0 channels): unspecified number of
 channels
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 Input #0, mpegts, from '/home/apasyniuk/builds/ts_multi_codec.ts':
   Duration: 00:01:21.02, start: 1.370067, bitrate: 4749 kb/s
   Program 2
     Stream #0:0[0x21]: Video: h264 (High) ([27][0][0][0] / 0x001B),
 yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25
 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x24]: Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, 0
 channels
     Stream #0:2[0x25]: Audio: aac (LC) ([17][0][0][0] / 0x0011), 48000 Hz,
 stereo, fltp, 115 kb/s
 Unsupported codec with id 86056 for input stream 1

 }}}

 we get 0 channels and following log
 {{{
 [mpegts @ 0x3715b00] Could not find codec parameters for stream 1 (Audio:
 eac3 ([6][0][0][0] / 0x0006), 48000 Hz, 0 channels): unspecified number of
 channels
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 }}}

 Link to test file :
 http://streaming.dolby.com/ftproot/mitXperts/ts/ts_multi_codec.ts

 Additionaly after reverting part of the changes everything seems to work
 correctly in this case:
 {{{
 g show 5e14c2b1a5441 libavcodec/aac_ac3_parser.c | git apply -R
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7372>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker