[FFmpeg-trac] #7869(ffmpeg:new): Can't open an m4a file

FFmpeg trac at avcodec.org
Thu Apr 25 20:40:50 EEST 2019


#7869: Can't open an m4a file
-------------------------------------+-------------------------------------
             Reporter:  luni-4       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:               |  master
  adts,m4a,aac                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Hi FFmpeg developers!

 I've tried to convert the m4a file attached to this issue in this way:

 {{{
 ffmpeg -i adts_m4a_aac_no_stream.m4a sample.mp3

 ffmpeg version N-47548-g8a3ed5a313 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 8 (Ubuntu 8.3.0-6ubuntu1~18.10)
   configuration: --disable-debug --disable-stripping --disable-libdrm
 --disable-cuda --enable-avisynth --enable-fontconfig --enable-gmp
 --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-
 libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm
 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
 --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-
 libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-
 libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libaom --enable-libxvid
 --enable-shared --enable-version3
   libavutil      56. 26.100 / 56. 26.100
   libavcodec     58. 51.100 / 58. 51.100
   libavformat    58. 27.102 / 58. 27.102
   libavdevice    58.  7.100 / 58.  7.100
   libavfilter     7. 48.100 /  7. 48.100
   libswscale      5.  4.100 /  5.  4.100
   libswresample   3.  4.100 /  3.  4.100
   libpostproc    55.  4.100 / 55.  4.100
 [aac @ 0x55830faeac00] Could not find codec parameters for stream 0
 (Audio: aac, 0 channels, fltp): unspecified sample rate
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 Input #0, aac, from 'adts_m4a_aac_no_stream.m4a':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Audio: aac, 0 channels, fltp
 Output #0, mp3, to 'sample.mp3':
 Output file #0 does not contain any stream
 }}}

 I've increased the value of `analyzeduration` and `probesize`, but nothing
 has changed.

 The file can be opened and reproduced using `VLC`, so it isn't corrupted.

 Thanks in advance for the reply!

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7869>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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