[MPlayer-dev-eng] Re: pre5?

[Felix Buenemann]

On Saturday 08 June 2002 03:59, D Richard Felker III wrote:
> > > 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?
Yes, normally if you convert FILM to PAL you just speed it up by around ~1 
FPS, this makes the speech sound higher pitched, a pitch scaling algorithm 
would allow to resample but stay at the original pitch.
-- 
Best Regards,
        Atmos
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