[vorbis] managed mode / max bitrate doesn't have effect

[Akos Maroy]

Hi,

I'm experimenting with managed mode encoding with specifying maximum 
bitrate. I call:

vorbis_encode_init( &vorbisInfo,
                     2,
                     44100,
                     -1,
                     96000,
                     96000);

to initialize the encoding. To my surprise, it seems the maxbitrate 
value of 96000 doesn't have an effect, the bitrate of the generated 
vorbis audio hovers around 96kb/s, going up to 105 kb/s every once in a 
while. If I call

vorbis_encode_init( &vorbisInfo,
                     2,
                     44100,
                     96000,
                     96000,
                     96000);

than the bitrate will vary between 83 and 98 kb/s approx. (The data is 
from XMMS as it displays the bitrate of the audio played.)

Am I missing something here, or are these soft upper and lower limits?

<p>Akos

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