this assumes the drift occurs at a constant rate, anyway if you run into issues in FCP, you can always put it through ffmpeg, like so: ffmpeg -i input.m4a -af atempo=1.001 output.wav
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Replying to @Dogen
was it too precise for FCP's clip retiming to adjust, or did the drift turn out to be nonlinear?
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Replying to @11rcombs
I tried converting the original audio file to a slower speed using compressor as an alternative, but even the difference between 99.97% and 99.98% was too great, unfortunately. Spent most of today trying physical tricks. About to test audio hijack!
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Replying to @Dogen
the ffmpeg command I mentioned will let you adjust the speed by arbitrarily precise factors
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or, well, technically the precision is something like 1 in a quadrillion but the point is that it's way more than 2 decimal places
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I actually think the audio hijack may have worked! Gonna do another test now, as my mic levels were a bit too low to accurately test. Will let you know!
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Replying to @Dogen
guess that confirms the problem was quicktime, then; good to know
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Replying to @11rcombs
Tried again and it seems to be working! The audio file still drifts, but the difference is down from 5-6 frames an hour to 1.5 an hour.
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End of conversation
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