[PD] Seam carving audio

hard off hard.off at gmail.com
Tue Jul 8 17:33:03 CEST 2008

i'm thinking about how you'd do this,

and the picture in my mind is of a single 2 second long clarinet note with a
hihat being hit after about 1 second.

so, if you were going to stretch or compress that, you'd want to preserve
the parts with the most 'colour' ...which i would guess would be the attack
of the clarinet and then especially the attack of the hihat.

[bonk~] will find those bits for you quite easily. so you can just mark the
sections bonk~ finds and set them as 'do not touch'

but the hard part is stretching the remaining sections.  i think ableton and
melodyne have good approaches for this, and from what i can gather it's a
good granular approach with the grain length being constantly adjusted so
that the playback doesn't introduce too much AM effect.

i have a feeling they also do a pitch analysis, so that the playback grain
length can be adjusted longer for lower overall pitch and shorter for higher
pitched sections.

i could be completely wrong of course.  wouldn't be the first time. :)
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