>
> I was wrong, earlier lame's encode the same way as the newer
> alphas. I am still surprised however at the bitrate selected for this
> piece. VBR 2 chooses 112 for 83% of the frames in this 3 second
> clip. With my volume maxed out I can barely hear the "sound". I
> guess I'm just a little surprised that lame doesn't choose a more
> aggressive bitrate considering the output level is so low.
>
Right now LAME uses the ATH has a threshold: below that, analog
silence is detected, but above that, the frame is encoded at full
quality. Since LAME doesn't know how loud you will play your mp3's,
the volume of the input is just a scaling that is removed during the
encoding through the "global_gain" variable.
> I haven't started to dig into the source yet, but I wonder if a more
> aggresive VBR selection could be used depending on the output level
> of a frame depending on the peak output (or average) of the entire
> piece. The 3 second track is all quite so maybe 112 could be
> justified (in case volume is maxed). But, in terms of the original
> track, the three seconds cropped could be considered silence in
> comparison to the peak or average output level of the whole track.
>
> Is this a rediculous idea?
>
Its not a ridiculous idea, but I would be afraid to get involved
since it sounds like yet even more settings and thresholds
that have to be tuned!
Mark
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