[LAU] Slow but pitch-correct video playback

[Philipp Überbacher]

On Tue, 23 Sep 2014 23:41:26 +0200
Tito Latini <tito.01beta at gmail.com> wrote:

> On Tue, Sep 23, 2014 at 08:21:30PM +0200, Philipp Überbacher wrote:
> > Hi there,
> > 
> > I encountered a nice piano learning video including hands and
> > animated keys, but since it is playing at original speed it is way
> > to fast for me to learn that song. In case anyone is interested,
> > it's this video and I think it's rather nicely done (don't hate me
> > for the music :P): https://www.youtube.com/watch?v=Ej6MF5KjuOc
> > 
> > I found one way which sort of works (after settings LADSPA_PATH)
> > but it sounds quite horrible. Is there a better way to do this?
> > http://markplusplus.wordpress.com/2006/10/01/pitch-correct-play-speed-with-mplayer/
> > 
> > Is there a stretchplayer for video?
> 
> The audio filter `scaletempo' should be acceptable for your purpose:
> 
>   mplayer -af scaletempo -speed 0.5 video...
> 
> it's a little better:
> 
>   mplayer -af scaletempo=stride=50:overlap=.25:search=20 -speed 0.5
> video...

Thanks Tito, it sounds indeed a little better than with the ladspa
plugin. I guess piano notes just sound a little weird at half speed.

Regards,
Philipp