[FFmpeg-trac] #9025(avcodec:new): Audio channel count detection trouble

[FFmpeg]

#9025: Audio channel count detection trouble
-------------------------------------+-------------------------------------
             Reporter:  laurfb       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:  audio        |  master
  channel count detection            |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 Commits 81503ac58a763a36b1f57264013b1e76acb62b68 (avcodec/utils: Require a
 non zero channels unless AV_CODEC_CAP_CHANNE…) broke proper audio channel
 count detection.

 Command used & uncut console output:

 D:\ffmpeg -i 00048.mts d:\output.mp4"
 ffmpeg version N-100123-g7dc22fe450-g052b4c3481+2 Copyright (c) 2000-2020
 the FFmpeg developers
   built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
   configuration:  --cc='ccache gcc' --cxx='ccache g++' --disable-
 autodetect --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va
 --enable-nvenc --enable-sdl2 --disable-debug --enable-ffnvcodec --enable-
 nvdec --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-
 libx264 --enable-libx265 --enable-fontconfig --enable-libfreetype
 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libtwolame --enable-libvidstab --enable-libwebp --enable-gpl
 --enable-libxvid --enable-libopenmpt --enable-version3 --enable-decklink
 --enable-libfdk-aac --enable-libfribidi --enable-opencl --enable-libsrt
 --enable-openssl --extra-cflags=-DLIBTWOLAME_STATIC --enable-nonfree
   libavutil      56. 61.100 / 56. 61.100
   libavcodec     58.114.100 / 58.114.100
   libavformat    58. 64.100 / 58. 64.100
   libavdevice    58. 11.103 / 58. 11.103
   libavfilter     7. 91.100 /  7. 91.100
   libswscale      5.  8.100 /  5.  8.100
   libswresample   3.  8.100 /  3.  8.100
   libpostproc    55.  8.100 / 55.  8.100
 [NULL @ 000001c63e715100] Decoder requires channel count but channels not
 set
 [mpegts @ 000001c63cf48180] Failed to open codec in
 avformat_find_stream_info
 [NULL @ 000001c63e715100] Decoder requires channel count but channels not
 set
 [mpegts @ 000001c63cf48180] Could not find codec parameters for stream 1
 (Audio: pcm_bluray (HDMV / 0x564D4448), 0 channels): unspecified sample
 rate
 Consider increasing the value for the 'analyzeduration' (0) and
 'probesize' (5000000) options
 Input #0, mpegts, from 'd:\00048.mts':
   Duration: 00:00:04.71, start: 1.040000, bitrate: 22564 kb/s
   Program 1
     Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
 yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn,
 50 tbc
     Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 0 channels
     Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] /
 0x0090), 1920x1080
 [pcm_bluray @ 000001c63eeee940] Decoder requires channel count but
 channels not set
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
   Stream #0:1 -> #0:1 (pcm_bluray (native) -> aac (native))
 Error while opening decoder for input stream #0:1 : Invalid argument

 Input file used: https://www9.zippyshare.com/v/HmINCifw/file.html
 Input file is an Mpeg-4 AVC with 2 audio BD LPCM recorded by an XDCAM Sony
 camcorder.

 ffmpeg build before this commit detect 2 audio channel and convert similar
 files without any error.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/9025>
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