[FFmpeg-trac] #1737(avcodec:new): ffmpeg detect aac stereo as mono

[FFmpeg]

#1737: ffmpeg detect aac stereo as mono
---------------------------------+--------------------------------------
             Reporter:  dmitry9  |                     Type:  defect
               Status:  new      |                 Priority:  important
            Component:  avcodec  |                  Version:  git-master
             Keywords:  aac      |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+--------------------------------------
 How to reproduce:
 {{{
 ffprobe -v 9 -loglevel 99 ./audio_aac_stereo_as_mono.mp4
 ffprobe version N-44445-ge332947 Copyright (c) 2007-2012 the FFmpeg
 developers
   built on Sep 14 2012 14:05:18 with gcc 4.6 (Ubuntu/Linaro
 4.6.3-1ubuntu5)
   configuration: --cc='gcc -O2 -m64 -mtune=core2 -pipe' --enable-version3
 --enable-libfaac --enable-libx264 --enable-pthreads --enable-gpl --enable-
 nonfree --enable-librtmp --enable-shared --enable-filter=movie --enable-
 avfilter --enable-libspeex --enable-libopencore-amrnb --enable-
 libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx
 --enable-libaacplus --enable-libvo-aacenc
   libavutil      51. 73.100 / 51. 73.100
   libavcodec     54. 55.100 / 54. 55.100
   libavformat    54. 27.100 / 54. 27.100
   libavdevice    54.  2.100 / 54.  2.100
   libavfilter     3. 16.103 /  3. 16.103
   libswscale      2.  1.101 /  2.  1.101
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x17953c0] Format mov,mp4,m4a,3gp,3g2,mj2
 probed with size=2048 and score=100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x17953c0] ISO: File Type Major Brand: isom
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x17953c0] File position before
 avformat_find_stream_info() is 1175362
 [aac @ 0x179cc60] channel element 0.0 is not allocated
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x17953c0] All info found
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x17953c0] File position after
 avformat_find_stream_info() is 143323
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './audio_aac_stereo_as_mono.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     title           : Teradek stream
     encoder         : Lavf54.27.100
     copyright       : Teradek
   Duration: 00:00:21.05, start: 0.000000, bitrate: 446 kb/s
     Stream #0:0(und), 41, 1/1000: Video: h264 (High) (avc1 / 0x31637661),
 yuv420p, 360x240 [SAR 32:27 DAR 16:9], 1/50, 407 kb/s, 23.86 fps, 25 tbr,
 1k tbn, 50 tbc
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(und), 120, 1/48000: Audio: aac (mp4a / 0x6134706D), 48000
 Hz, mono, s16, 32 kb/s
     Metadata:
       handler_name    : SoundHandler
 [h264 @ 0x179bc00] detected 8 logical cores
 [AVIOContext @ 0x179da40] Statistics: 214912 bytes read, 2 seeks
 }}}

 Attach log for:
 {{{
 ffmpeg -v 9 -loglevel 99 -i ./audio_aac_stereo_as_mono.mp4 -vcodec copy
 -acodec libfaac -ar 22050 -report -f mp4 /tmp/aaa3.mp4
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1737>
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