[LAU] Slow but pitch-correct video playback

[Edgar Aichinger]

Am Dienstag, 23. September 2014, 22:29:27 schrieb Philipp Überbacher:
> On Tue, 23 Sep 2014 20:39:03 +0200
> Edgar Aichinger <edogawa at aon.at> wrote:
> 
> > Am Dienstag, 23. September 2014, 20:21:30 schrieb Philipp Überbacher:
> > > 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?
> > 
> > VLC can do that, there's no nice GUI element for speed control, but a
> > submenu in "playback" menu... don't expect high quality either.
> > 
> > Edgar
> 
> Hi Edgar,
> 
> both mplayer and VLC provide such controls, it allows to slow
> down or speed up the video but the audio is not pitch corrected as far
> as I can tell.

Hi again, Philipp,

I wouldn't have suggested it if it wouldn't timestretch (while retaining pitch), I also explicitely tested it before I sent my mail and can assure that it doesn't change pitch while slowing down, both in video and audio files...  

Edgar
> 
> A line like this works but requires to set the pitch beforehand
> and also sounds rather bad.
> mplayer -speed 0.5 -af ladspa=tap_pitch:tap_pitch:0:100:-90:0 Careless\
> Whisper\,\ George\ Michael\,\ piano-Ej6MF5KjuOc.mp4
> 
> Regards,
> Philipp
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