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Old 02-15-2020, 02:24 AM   #1
Glubber
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Join Date: Dec 2007
Posts: 203
Default Stretch causing clicks and Inaccurate waveform

Step 1) Import sine.wav file to empty track.
Step 2) Split item at zero-crossing.
Step 3) Slightly time-stretch the left half of item, using left edge.



Result (above): Audible click at split point, even though wave form looks perfect.

Step 4) Glue 2 items back together.
Result: The waveform updates to show the cause of clicking:



I tried all the different stretch algorithms in Project Settings, same result. Is this inevitable, because play-rate must change in order to stretch? When I try a similar process using stretch markers instead of splitting the item, I get similar artifacts. I have selected "Tonal-optimize" under Project settings. Crossfading doesn't fix this. Forgive my ignorance.
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Old 06-03-2020, 12:18 PM   #2
juliansader
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Join Date: Jul 2009
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Default

Stretch marker in REAPER are unfortunately very buggy and glitchy. I have reported similar results as yours in threads such as:
v6.02+dev1222 - December 22 2019
RubberBand Library Stretch Audio to Tempo Map

When I performed the same tests in Melodyne (inside REAPER with ARA2), Studio One (with Elastique) and Mulab (which is renowned for having excellent, custom audio stretching algorithms), there are no glitches.
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