[FFmpeg-trac] #4714(avcodec:new): wmalossless decoder is not lossless
FFmpeg
trac at avcodec.org
Sun Jul 12 14:53:51 CEST 2015
#4714: wmalossless decoder is not lossless
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Reporter: ami_stuff | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: wmalossless | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by ami_stuff):
Replying to [comment:1 cehoyos]:
> I tested the following:
> {{{
> $ mplayer test.wma -ac wma9dmo -ao pcm
> }}}
> The output file is shorter than FFmpeg's output (and bitexact for the
size).
> Is there a tool that decodes a longer file? (Is your wav file the input
or the output file?)
Yup, mplayer with binary codec is even worst than ffmpeg's decoder (less
data is decoded):
ffmpeg -i mplayer.wav/ffmpeg.wav/freac.wav -f s16le
mplayer.pcm/ffmpeg.pcm/freac.pcm
mplayer.pcm - 5275648 bytes
ffmpeg.pcm - 5283840 bytes
freac.pcm - 5294592 bytes
so to reproduce this one would need to run "fre:ac" program under windows
and decode
test.wma to freac_win.wav then next:
ffmpeg -i freac_win.wav -f s16le freac_win.pcm
and freac_win.pcm will match:
ffmpeg -i input.wav -f s16le input.pcm
"input.wav" is the file I used to encode test.wma
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4714#comment:3>
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