Something is (a little) off with Kdenlive AudioCorrelation

 I did some test with synthetic WAV files (short burst of 5 cycles). Here's the alignement Kdenlive found for a 10 kHz bip (inside Kdenlive I mixed  the Reference Sound and the aligned one into a stereo WAV file, here shown within Audacity)

They are off by almost 200 samples (@48ksps). Pourtant, with sci.py correlate  the match is within an audio sample... hmm.

Note: the Kdenlive fitting is off by 3.45 ms, which is well within a video frame interval (33 ms for a 30 fps project).

Here's the jupyter notebook for those interested: link