[FFmpeg-devel] [BUG] Cannot decode asf file with G.726 audio

[Michael Niedermayer]

On Sun, May 06, 2007 at 07:07:03PM +0100, Patrice Bensoussan wrote:
> Hello,
> 
> It seems ffmpeg cannot decode some asf files which have G.726 audio.  
> Here is the output I get:
> 
>   > ./ffmpeg -i ~/Desktop/sample_g726.asf ~/Desktop/sample.mp4
> FFmpeg version SVN-r8919, Copyright (c) 2000-2007 Fabrice Bellard, et  
> al.
>    configuration: --cc=gcc-3.3 --enable-pthreads --disable-network -- 
> disable-vhook --enable-small --enable-libmp3lame --enable-libfaac -- 
> disable-decoder=atrac3 --disable-decoder=cook --extra-ldflags=-L/ 
> Users/patriceb/tmp/WMA/opt/lib --extra-cflags=-I/Users/patriceb/tmp/ 
> WMA/opt/include --enable-gpl --enable-x264 --enable-liba52 --enable- 
> libfaad
>    libavutil version: 49.4.0
>    libavcodec version: 51.40.4
>    libavformat version: 51.12.1
>    built on May  6 2007 18:00:14, gcc: 3.3 20030304 (Apple Computer,  
> Inc. build 1819)
> 
> Seems stream 1 codec frame rate differs from container frame rate:  
> 1000.00 (1000/1) -> 5.00 (5/1)
> Input #0, asf, from '/Users/patriceb/Desktop/sample_g726.asf':
>    Duration: 00:01:30.4, start: 0.600000, bitrate: 488 kb/s
>    Stream #0.0: Audio: g726, 32000 Hz, mono, 128 kb/s
>    Stream #0.1: Video: mpeg4, yuv420p, 320x240,  5.00 fps(r)
> Output #0, mp4, to '/Users/patriceb/Desktop/sample.mp4':
>    Stream #0.0: Video: mpeg4, yuv420p, 320x240, q=2-31, 200 kb/s,   
> 5.00 fps(c)
>    Stream #0.1: Audio: aac, 32000 Hz, mono, 64 kb/s
> Stream mapping:
>    Stream #0.1 -> #0.0
>    Stream #0.0 -> #0.1
> [g726 @ 0x37402c]G726: unsupported audio format
> Error while opening codec for input stream #0.0
> 
> Looking more into g726.c here is what I could find out:
> 
> In g726_init, there is a test on the bit rate. This file uses 128000  
> so the first test fails. If I understand the code correctly, it seems  
> we are missing some tables in G726Tables_pool to support this bit rate.
> 
> I am not too familiar with G.726, so not sure which values should be  
> added in this table... Anyone can have a look and see if this can be  
> fixed? I have uploaded the sample file:
> 
> ftp://upload.mplayerhq.hu/MPlayer/incoming/sample_g726

Was this fixed? The file is no longer in incoming ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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