[MPlayer-dev-eng] Re: pre5?

[D Richard Felker III]

On Sat, Jun 08, 2002 at 12:27:01AM +0200, Felix Buenemann wrote:
> On Friday 07 June 2002 16:26, Tobias Diedrich wrote:
> > Anders Johansson wrote:
> > > > BTW, once the new AO plugin architecture is in place, is anyone
> > > > interested in fixing resample so the pitch isn't off by so much? It's
> > > > frequently off by as much as 5% with the current implementation...
> > >
> > > Can you hear it? I have never tried listening t music or anything like
> >
> > Well it would definetely be nice to have an exact resampling plugin,
> > e.g. for playing 23.98fps movies at 25fps.
> > (Movies are converted to PAL by increasing speed)
> For that purpose it is desirable to use a pitch scaling algorithm, that would 
> allow to resample the sound without modifying the pitch, so the speech still 
> sounds natural. An interesting algorithmn for pitch-scaling can be found at:
> http://www.dspdimension.com/ (with sample sources)

Umm, resampling should never adjust pitch aside from adding artifacts
at other frequencies due to aliasing, etc. IIRC, pitch scaling would
be for when you want to speed up/slow down sound without changing the
pitch, right?

Anyway, personally, I'd be happy with a horrid nearest-neighbor
resampler if it could just get the frequency right. But it probably
doesn't make sense to work on anything until the new aop system is
designed and implemented.


Rich