[MPlayer-users] Native MPEG-TS demuxer failure with AAC

Nicolas George nicolas.george at normalesup.org
Mon Mar 28 19:05:21 CEST 2011


Hi.

I just uploaded the following file to incoming:
mpegts_h264_aac-mpegts_fails-lavf_ok.ts
(10 Mo)

Someone had a problem with it on French-speaking Usenet.

Using latest SVN (33136), playing with -demuxer mpegts gives:

Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
[aac @ 0xbdff20]channel element 1.14 is not allocated
[aac @ 0xbdff20]channel element 1.13 is not allocated
[aac @ 0xbdff20]channel element 0.9 is not allocated
[aac @ 0xbdff20]channel element 1.10 is not allocated
[aac @ 0xbdff20]channel element 1.3 is not allocated
[aac @ 0xbdff20]channel element 2.1 is not allocated
Unknown/missing audio format -> no sound
ADecoder init failed :(
Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
FAAD: compressed input bitrate missing, assuming 128kbit/s!
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
FAAD: error: Invalid number of channels, trying to resync!
(last line repeated ad nauseam)

... and no audio.

With -demuxer lavf:

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
[aac @ 0xbdff20]channel element 1.14 is not allocated
AUDIO: 48000 Hz, 2 ch, s16le, 144.4 kbit/9.40% (ratio: 18046->192000)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================

... and audio works fine.

If someone is interested in investigating why...

Regards,

-- 
  Nicolas George
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