[FFmpeg-trac] #4367(avcodec:new): 24-bit WMA Lossless Doesn't Actually Work

FFmpeg trac at avcodec.org
Sat Mar 14 18:02:11 CET 2015

#4367: 24-bit WMA Lossless Doesn't Actually Work
               Reporter:  dbuitenh   |                  Owner:  michael
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:  avcodec
                Version:  git-       |               Keywords:  wma
  master                             |  wmalossless
             Blocked By:             |               Blocking:
Reproduced by developer:  1          |  Analyzed by developer:  0
 Summary of the bug:

 The WMA Lossless 24-bit "support" added in
 ce6141259bb910aa7f580f55cf71e3c503f9a4fb does not actually work. The audio
 is decoded in a very broken and distorted way.

 Sample: http://chromashift.org/samples/wmall.wmv
 Decoded with official DirectShow filter:
 Decoded with libavcodec: http://chromashift.org/samples/ffmpeg_decoded.wv

 How to reproduce:
 % ffmpeg -i wmall.wmv out.wav

 Log of ffmpeg output is here:

Ticket URL: <https://trac.ffmpeg.org/ticket/4367>
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