Sorry for my poor math/music knowledge..
Assumed whe want to play a video file at 50% and at 75 % speed how much cent do I have to shift in both situation to keep the same pitch and what would be the formula?
Thanks in advance!!
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reducing the frequency by 50% means the sound is one octave lower
one octave is 12 halve-tones
1 halve tone is 100 cents
so if you play it at 50% you need to pitch it up by 1200 cent