>
> Hi,
>
> I think it will be useful to have (optional) switches for limiting maximal
> and minimal bitrate in VBR mode. I did some sound tests and I decided that
> at least minimal bitrate should be forced - I discovered indication of
> strange artefacts (distortion?) at high freq even with -V 0. What is
> Your opinion, Mark?
>
I agree. Having no minimum means you have complete faith in the
psycho-acoustic model. (-b will set the minimum bit rate, by the way)
-V 0 means no audible distortion, as measured by the psycho-acoustic
model. The encoded frame can still have a very large amount of
distortion, as long as the psy model claims that the distortion
will be masked (and not audible). Errors in the psy model
can thus lead to distortion even with -V 0.
It would be nice to have a better psy-model, but I dont know
of any in the literature other than the one we have.
I've read papers on PAC and AAC, and they both claim to use the
MP3 psy-model.
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