Vorbis - Jul 2009 - The Vorbis encoder could not set up a mode according to the requested quality or bitrate.

I built ffmpeg2theora from SVN, using libogg 1.1.4, libvorbis 1.2.3  
and Thusnelda from SVN. Running ffmpeg2theora --help reports that  
ffmpeg2theora accepts a range of -2 to 10 for the --audioquality  
option and a bitrate of 32 to 500 for the --audiobitrate option, but  
it doesn't appear to actually accept any of the low end numbers.

It appears that the lowest acceptable value for  --audioquality is -1  
and the lowest acceptable value for --audiobitrate is 45.

Anyone know what's up?


jason$ ffmpeg2theora --audioquality -2 /Users/jason/test.m4a
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/jason/test.m4a':
   Duration: 00:04:22.73, start: 0.000000, bitrate: 129 kb/s
     Stream #0.0(und): Audio: aac, 44100 Hz, stereo, s16
The Vorbis encoder could not set up a mode according to
the requested quality or bitrate.


mini:~ jason$ ffmpeg2theora --audiobitrate 32 /Users/jason/test.m4a
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/jason/test.m4a':
   Duration: 00:04:22.73, start: 0.000000, bitrate: 129 kb/s
     Stream #0.0(und): Audio: aac, 44100 Hz, stereo, s16
The Vorbis encoder could not set up a mode according to
the requested quality or bitrate.

On Thu, Jul 23, 2009 at 11:38 PM, Jason Self<jason.self at gmail.com>
wrote:
> I built ffmpeg2theora from SVN, using libogg 1.1.4, libvorbis 1.2.3
> and Thusnelda from SVN. Running ffmpeg2theora --help reports that
> ffmpeg2theora accepts a range of -2 to 10 for the --audioquality
> option and a bitrate of 32 to 500 for the --audiobitrate option, but
> it doesn't appear to actually accept any of the low end numbers.
>
> It appears that the lowest acceptable value for ?--audioquality is -1
> and the lowest acceptable value for --audiobitrate is 45.
The values being reported by ffmpeg2theora are the ones supported by
the AoTuV vorbis encoder, not the Xiph.Org libvorbis.

Monty