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Old 03-21-2015, 11:18 AM   #1
Ice
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Join Date: Aug 2014
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Default Session exports with playrates set low - not matching playback

I'm moving this conversation here, in the event this can be considered a bug.

from here:
http://forum.cockos.com/showthread.p...=1#post1499943


Here is an example session including notes on how to reproduce.

https://dl.dropboxusercontent.com/u/...per%20Loss.zip


The crux of it is the rendered files sound different, in a lossy way, than what I hear in playback, and I'd like to try to not lose sight of that being the issue.

This example is simple, but is the canary in the coal mine of what has turned out to be a larger issue that has bitten me the last few weeks by me trusting the renders.

The session opens up with notes so I don't want to repeat that here.

Thanks for taking a look!

Last edited by Ice; 03-21-2015 at 11:37 AM. Reason: typo fix
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Old 03-22-2015, 05:23 PM   #2
Ice
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Join Date: Aug 2014
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Culprit found..... I think. The session SR was set higher than the hardware would allow. While there were no complaints during playback, the session I guess isn't running at the rate advertised. And then on render, not sure whats happening but thats where the difference occurs.

I haven't tested this yet using hardware that goes all the way to 192k, but I will try to tomorrow. But today using hardware that only goes as far as 96k I can reproduce, and also "fix" the render to match what I'm hearing.

So here's the setup:

192k WAVE file(s)
Session set to 192k
Render to 48k, or 192k - mushy output compared to what I hear in playback.

Now if I set the session rate to 48k, it sounds the same to me on playback as it did set to 192k, at least with the few tests I've done, and all the renders match what I hear in playback as far as I can tell so far.

So the sessions weren't really running at 192k as I thought they were?



Here are screenshots of the exact same session output settings, where the session was first set to 192k, and then to 48k. And the 48k session one matches what I hear in playback.

192k session - mushy - render doesn't match what I hear in playback:

https://dl.dropboxusercontent.com/u/...92kSession.png


48k session - render matches what I hear:

https://dl.dropboxusercontent.com/u/...48kSession.png



So I don't know if this is a bug or not, but I can say interfacing-wise I've been pulling my hair out trying to get my renders to match what I hear in playback.

Regardless what sort of flexibility and great numbers are going on under the hood, I feel like some sort of check needs to be made and the user warned that the output will not match what they've been hearing.
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