[libav-bugs] [Bug 571] New: Can't transcode mpc audio file

bugzilla at libav.org bugzilla at libav.org
Wed Oct 9 10:27:21 CEST 2013


https://bugzilla.libav.org/show_bug.cgi?id=571

           Summary: Can't transcode mpc audio file
           Product: Libav
           Version: git HEAD
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: general
        AssignedTo: bugzilla at libav.org
        ReportedBy: viacheslav.dukalskiy at f-secure.com


Created attachment 433
  --> https://bugzilla.libav.org/attachment.cgi?id=433
Problematic audio file

When converting mpc audio to mp4, duration has been truncated and resulted
audio becomes inaudible.

Command:
$ avconv -i /mnt/Data/AUD-5C.mpc  -acodec libfaac -ab 64000 -ar 32000 -f mp4
/tmp/test.m4a

There were multiple errors like these:
...
Error while decoding stream #0:0
Error decoding frame: used 2504 of 2496 bits
Error while decoding stream #0:0
Error decoding frame: used 2472 of 2464 bits
Error while decoding stream #0:0

Libav:
$ avconv -v 9 -loglevel 99
avconv version 0.8.6-6:0.8.6-1~bpo60+1proj1, Copyright (c) 2000-2013 the Libav
developers
  built on Aug  7 2013 13:17:09 with gcc 4.4.5
  configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect
--extra-version='6:0.8.6-1~bpo60+1proj1' --libdir=/usr/lib/ --prefix=/usr
--enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype
--enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame
--enable-librtmp --enable-libopenjpeg --enable-libpulse
--enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi
--enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl
--enable-postproc --enable-swscale --enable-libcdio --enable-x11grab
--enable-libx264 --enable-libxvid --enable-libfaac --enable-nonfree
--enable-shared --disable-static
  libavutil    51. 22. 1 / 51. 22. 1
  libavcodec   53. 35. 0 / 53. 35. 0
  libavformat  53. 21. 1 / 53. 21. 1
  libavdevice  53.  2. 0 / 53.  2. 0
  libavfilter   2. 15. 0 /  2. 15. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  52.  0. 0 / 52.  0. 0
Hyper fast Audio and Video encoder
usage: avconv [options] [[infile options] -i infile]... {[outfile options]
outfile}...

Use -h to get full help or, even better, run 'man avconv'

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