[Flac-dev] Re: nice idea

Hod McWuff hod at wuff.dhs.org
Sat Oct 5 09:27:02 PDT 2002

Hmm... when using variable bitrate with MP3, the bitrate clearly follows
complexity. I've no idea how that algorithm works, but maybe it can be
adapted. When it decides to change the bitrate, that's where you want a
frame break.

On Sat, 2002-10-05 at 03:19, Miroslav Lichvar wrote:
> On Fri, Oct 04, 2002 at 01:57:03PM -0400, Hod McWuff wrote:
> > Agreed that the oversampling isn't useful in the long term. I'm not sure
> > what you mean by 'dictioniary overhead'.
> > 
> > I'd like to see an easy-to-invoke set of parameters that will spare no
> > cpu expense and produce the tightest theoretically possible output.
> > 
> > I'm guessing the best of Marco's idea can be achieved by adding
> > heuristics to dynamically determine optimal frame size based on say, a
> > maximum standard deviation of a complexity measurement. The idea is to
> > tie the frame breaks to dramatic changes in the signal. If the guitarist
> > plucks a string, or the vocalist starts a new syllable, that should also
> > mark a frame boundary. 
> I was playing with variable blocksize some time ago. I used something
> like brute force search, no invention at all. I got ~1.5% improvement
> of compression, but 10 second sample took about hour of encoding :-).
> If there is some fast algo for that, it would be cool.
> -- 
> Miroslav Lichvar
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