Carsten wrote: ↑Wed Sep 06, 2023 1:55 pm
DCP-o-matic adjusts everything automatically. You will be notified about this in the bottom of video and audio tab:
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musical notation pitch ?
Sampling rate affects sound quality.
The lower the sample rate, the The sound quality will decrease.
So I increased the sound speed from other software. The one I use regularly is Vegas to keep the notes from distorting from the original. And the sample rate remains the same at 48Khz.
Last edited by RAY-NUE on Thu Sep 07, 2023 1:39 am, edited 1 time in total.
The delay for various interface methods and driver methods is not specified. Other than for native Apple audio hardware. One would like to have a +/- delay setting in DCP-o-matic player, but, my fear is that this would make things even more complicated. It would probably have to be tied to a specific device, so that e.g. a USB audio interface would have a different delay (predelay) than the native Apple audio interface.
RAY-NUE wrote: ↑Wed Sep 06, 2023 11:16 pmSampling rate affects sound quality. The lower the sample rate, the The sound quality will decrease. So I increased the sound speed from other software. The one I use regularly is Vegas to keep the notes from distorting from the original. And the sample rate remains the same at 48Khz.
The relative quality difference between 48000 Hz and 47952 Hz is quite marginal, at best. I'd even be surprised that anybody could detect that, once the DCP is played back at 48 kHz, the pitch is raised by 0.1 %.
RAY-NUE wrote: ↑Wed Sep 06, 2023 11:16 pmSampling rate affects sound quality. The lower the sample rate, the The sound quality will decrease. So I increased the sound speed from other software. The one I use regularly is Vegas to keep the notes from distorting from the original. And the sample rate remains the same at 48Khz.
The relative quality difference between 48000 Hz and 47952 Hz is quite marginal, at best. I'd even be surprised that anybody could detect that, once the DCP is played back at 48 kHz, the pitch is raised by 0.1 %.
I think the sample rate difference is irrelevant here - we are talking about a tiny difference. If you're keeping the same number of video frames and going from 23.976 to 24 your choice is to either:
pitch shift by 0.1%, as DCP-o-matic will do
time stretching by 0.1%, as other software can do
If someone can present some listening tests to show that time stretching is preferable (when done with some open-source library) I'd be happy to look at adding it to DCP-o-matic.
carl wrote: ↑Thu Sep 07, 2023 1:34 pm
I think the sample rate difference is irrelevant here - we are talking about a tiny difference. If you're keeping the same number of video frames and going from 23.976 to 24 your choice is to either:
pitch shift by 0.1%, as DCP-o-matic will do
time stretching by 0.1%, as other software can do
If someone can present some listening tests to show that time stretching is preferable (when done with some open-source library) I'd be happy to look at adding it to DCP-o-matic.
Vegas Pro increases audio speed by 0.1% for 23.976fps IVTC footage. increases it to 24fps film. It only increases speed but doesn't cause pitch shift in the audio.
