• Compression Techniques

  AAC-Low Delay decoding issue

  Posted by Thushan Amarasiriwardena on March 15, 2011 at 9:41 pm

  Howdy,

  I’m having an issue decoding AAC-LD (Low Delay) files using a recent build of FFmpeg. Every time I try to decode it I get the issue: “Audio object type 23 is not supported”

  This audio file is coming off an iPad using the built in compressor. Has anyone else had these issues? The file plays fine in QuickTime.

  Many thanks,
  -Thushan

  ffmpeg -i 96ECEBBC-EBDC-43C7-90DE-01FCB7B0240B.m4a -ac 1 -ar 44100 96ECEBBC-EBDC-43C7-90DE-01FCB7B0240B.mp3

  FFmpeg version SVN-r24986, Copyright (c) 2000-2010 the FFmpeg developers
  built on Mar 14 2011 11:21:48 with gcc 4.4.3
  configuration: –enable-gpl –enable-nonfree –enable-pthreads –enable-libx264 –enable-libfaac –enable-libmp3lame
  libavutil 50.24. 0 / 50.24. 0
  libavcore 0. 6. 0 / 0. 6. 0
  libavcodec 52.87. 0 / 52.87. 0
  libavformat 52.78. 3 / 52.78. 3
  libavdevice 52. 2. 1 / 52. 2. 1
  libavfilter 1.38. 1 / 1.38. 1
  libswscale 0.11. 0 / 0.11. 0
  [aac @ 0x1ea4930] Audio object type 23 is not supported.
  Last message repeated 433 times
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1ea3470] max_analyze_duration reached
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’96ECEBBC-EBDC-43C7-90DE-01FCB7B0240B.m4a’:
  Metadata:
  major_brand : M4A
  minor_version : 0
  compatible_brands: M4A mp42isom
  Duration: 00:00:30.75, start: 0.000000, bitrate: 93 kb/s
  Stream #0.0(eng): Audio: aac, 0 channels, 65 kb/s
  96ECEBBC-EBDC-43C7-90DE-01FCB7B0240B.mp3: Permission denied

  Thushan Amarasiriwardena replied 15 years, 5 months ago 1 Member · 0 Replies
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