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Old 11-22-2007, 08:44 AM   #1
jroyce
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Registered: Nov 2007
Posts: 34

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Angry ffmpeg not decoding AC3 audio


I am going crazy trying to get ffmpeg to convert an avi file to mpeg-2 format. Here is the command line I am using:

ffmpeg -target ntsc-dvd -i csi.807.hdtv-lol.[VTV].avi CSI_Season_8_Episode_7.mpg

and the output from ffmpeg:
ffmpeg -target ntsc-dvd -i csi.807.hdtv-lol.[VTV].avi CSI_Season_8_Episode_7.mpg
FFmpeg version SVN-r10937, Copyright (c) 2000-2007 Fabrice Bellard, et al.
configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --enable-libmp3lame --enable-libogg --enable-libvorbis --enable-libtheora --enable-libfaad --enable-libfaac --enable-libxvid --enable-liba52 --enable-swscaler --enable-pp --enable-gpl --enable-vhook --enable-x11grab --enable-libgsm --enable-libx264 --enable-libamr-nb --enable-libamr-wb
libavutil version: 49.5.0
libavcodec version: 51.47.2
libavformat version: 51.17.1
built on Nov 7 2007 00:38:44, gcc: 4.2.1 (SUSE Linux)
Unknown decoder 'ac3'

This is so frustrating. I tried compiling ffmpeg from source as well, and this was no better. You can see in the ffmpeg output that the RPM installation was configured with the "-enable-liba52' option, which is supposed to enable AC3 audio.

If I type 'whereis liba52' I get:
liba52: /usr/lib/liba52.a /usr/lib/liba52.so /usr/lib/liba52.la

I've also tried to force the audio type using the -acodec ac3 option in ffmpeg but that doesn't work either.

The strangest part is that I suddenly get the same error on .avi files which I have previously converted to MPG.

This is on OpenSuse 10.3. To make it even a bit wierder, I get the same error if I use a binary version of ffmpeg in Windows.

I can play the file in Totem without any trouble. Both the sound and video are fine.
 
Old 11-23-2007, 02:16 AM   #2
Simon Bridge
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Distribution: Ubuntu
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Would there be DRM on that file? Try another file, preferably one you haven't attempted to convert before.
 
Old 11-23-2007, 07:01 AM   #3
jroyce
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Registered: Nov 2007
Posts: 34

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No DRM. I have other files that I've successfully converted with ffmpeg on my Ubuntu 7.04 installation and I get the same result.

I recently set up that Ubuntu system as a firewall+server, so last night I used ssh to login to that computer and I converted the same file on that PC using ffmpeg and it worked fine.

This is less-than-ideal since my new PC could do the conversion in minutes while the old firewall PC takes about 1/2 an hour.

So now I am wondering what is special about ffmpeg on Suse 10.3?
 
Old 11-23-2007, 09:32 AM   #4
Simon Bridge
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Location: Waiheke NZ
Distribution: Ubuntu
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Possibly the difference is that you compiled it from source. I take it ffmpeg from YaST is no good? I'd go through that compile carefully - will openSUSE ffmpeg convert other formats?
 
  


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