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

[Michael Niedermayer]

On Sat, Jan 26, 2008 at 01:31:46PM +0100, Diego Biurrun wrote:
> On Fri, Jan 25, 2008 at 09:02:44PM +0100, Michael Niedermayer wrote:
> > On Sun, May 06, 2007 at 07:07:03PM +0100, Patrice Bensoussan wrote:
> > > 
> > > 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 ...
> 
> Is it this one?
> 
> http://samples.mplayerhq.hu/A-codecs/g726/sample_g726.asf
> 
> Yes, that sample appears not to work.

Should be fixed ...

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If a bugfix only changes things apparently unrelated to the bug with no
further explanation, that is a good sign that the bugfix is wrong.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20080620/bbe5da7a/attachment.pgp>