Old 10-19-2014, 04:24 AM   #1
mete0r
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Default Big audio file "lag"

When chopping up and using small portions of a big audio file (for example, a bar one minute in the audio file) without gluing them, the reaper interface starts to lag a lot and there is a big delay before the audio begins if you start the playback from near the chopped portion.

The solutions is just to glue the bits, but maybe there is a simple fix/optimization that can be made?

(also not sure if this is exactly the right place, but since it's not really a big problem...)
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Old 10-19-2014, 05:54 AM   #2
Tim Ragnur
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I'm guessing this could be because you are running the project in a different sample rate than the audio file(s). If so, each items will be showing a tourquis rectangle with "i" in upper left corner.
This means a lot of computer power is beeing spend on live resampling, causing big latency.

So either match project SR to that of the audio file (preferable) - or glue everything (which will make new files with project SR).
Sample rate is set in Project settings.
View audio file sample rate by item double clicking, then click properties.
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Old 10-19-2014, 07:45 PM   #3
Argitoth
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im working with a 16gig wav file, gluing didn't help because the wav file would still be part of the project. Undoing, healing, sometimes splitting would take forever. I had to convert the file to ogg to get anything done. Changing audio interface samplerate to match wav file didn't help. I think using FLAC would not be a good idea because that's essentially a zipped wav file, as I understand it, and it seemed that caused problems as well.
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Last edited by Argitoth; 10-19-2014 at 08:19 PM. Reason: typo
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Old 10-19-2014, 07:57 PM   #4
TimOBrien
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Are you running audio tracks on a separate dedicated hard drive? (You should)
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Old 10-20-2014, 05:56 AM   #5
mete0r
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@TimOBrien, I am. It's a regular hard drive though, not an ssd.

@Tim Ragnur, while I am not, a lot of the chopping up involves pitch shifting and time stretching (with and without the pitch preservation), so I'm guessing there's not much I can do except gluing/freezing.

Quote:
Originally Posted by Argitoth View Post
im working with a 16gig wav file, gluing didn't help because the wav file would still be part of the project. Undoing, healing, sometimes splitting would take forever. I had to convert the file to ogg to get anything done. Changing audio interface samplerate to match wav file didn't help. I think using FLAC would not be a good idea because that's essentially a zipped wav file, as I understand it, and it seemed that caused problems as well.
ouch. I am using flac though, so I will try temporarily switching to wav to see if it improves the situation.
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Old 10-20-2014, 08:44 AM   #6
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if wav doesn't work: convert to ogg, work non-destructively. when you're ready, replace the media with the wav version.
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Old 10-20-2014, 11:34 AM   #7
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Quote:
Originally Posted by Argitoth View Post
replace the media with the wav version.
Whoa, I didn't even think you could do this. I will definitely try it.
And by the way, I'll post later in the chaos jsfx thread, but... whoa. It's the coolest audio-thing I heard since I don't know when.
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