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Sub frame audio slipping not sticking

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Mike Kelland
Sub frame audio slipping not sticking
on Oct 19, 2016 at 9:38:16 pm

In Pr Pro CC 2015.4 I enable Audio Time Units, zoom in and slip the audio by a subframe amount to fix phasing between mic channels, back-timing music precisely etc.

I turn off Audio Time Units and continue editing. But as soon as the audio that was altered is nudged/moved, the sub frame slip reverts to the nearest frame, usually back to how it was.

This happens on three separate Pr Pro CC systems here, running different versions of Pr. Can anyone else try it and confirm I'm not going mad (or doing it incorrectly)? Happens with linked audio, music etc.

It used to work fine in the past.

Thanks,

Mike


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Dave LaRonde
Re: Sub frame audio slipping not sticking
on Oct 20, 2016 at 3:18:16 pm
Last Edited By Dave LaRonde on Oct 20, 2016 at 4:59:20 pm

If you have phasing problems, it may be due to the sample rate: 44.1 vs. 48, for example. The audio sample rates should match. You can fix them in Audition, where you KNOW it'll be right. Then you just have to cut.

A similar thing applies to the music -- if you're so picky about cutting the music, do it in Audition so you get it right. Personally, I wouldn't be too concerned about backtiming a music file. Just alter the fade out.

I also assume that you know you NEVER use mp3 or any other kind of compressed audio because you know they just cause a lot of problems. Audition can fix that, too.

It's always safest if the audio sample rates match throughout the project for this very reason.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Mike Kelland
Re: Sub frame audio slipping not sticking
on Oct 20, 2016 at 8:41:18 pm

Hi Dave,

Not after a lesson in best practice with audio file sample rates etc - this isn't my first rodeo. Yes I am 'picky', nearest frame for audio is not close enough - which is why Pr allows Audio Time Units in the first place!

I'm wanting to know if the feature of Premiere Pro CC being able to slip audio by sub frame amounts is broken or not.

Cheers,

Mike


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Jeff Pulera
Re: Sub frame audio slipping not sticking
on Oct 21, 2016 at 2:23:06 pm

Hi Mike,

I had been having the same issue some time ago with CS6. I want to say that my fix was to return to frames display, then put a razor cut near beginning of the audio clip to "lock it in". If memory serves. Think about it - if you nudge the end of the audio clip to what is basically a position between two frames, then return to frame display, how does Premiere show where the end of the clip is, since it falls between the frames? Not saying that behavior is correct to start with, but I believe that was my fix.

Thanks

Jeff Pulera
Safe Harbor Computers


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Mike Kelland
Re: Sub frame audio slipping not sticking
on Oct 21, 2016 at 7:39:23 pm

Thanks Jeff, will try putting a razor blade on to see if it locks it in - but, to be clear, I'm trying to slip the audio a sub-frame amount, not nudge a sub-frame amount.
It lets you slip the audio (if it's a sync clip it will display -0.4350 on the clip for example, if you've slipped it that much in that direction), you return to frame view and it's still slipped by the amount you want. But when you move that clip by any amount of frames on the timeline, the sound and it's waveform reverts back to where it was before you've slipped it.

My workaround in the meantime is right click and send to Audition which kind of locks it in. Creates more audio files though...


Cheers,

Mike


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Jeff Pulera
Re: Sub frame audio slipping not sticking
on Oct 21, 2016 at 7:55:43 pm

Hi Mike,

I don't know the difference between slipping and nudging. However, my audio clips are always unlinked from video before I try moving them. After reading your post, I tried switching to Audio Units and then "moving" the audio of a linked clip, and sure enough the counter seems to indicate I have moved (offset) the audio, so maybe that is what you are referring to?

Try unlinking if you haven't and see if that helps

Thanks

Jeff Pulera
Safe Harbor Computers


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Jonathan Ramsey
Re: Sub frame audio slipping not sticking
on Nov 7, 2016 at 5:14:32 pm

Not sure if this is the same thing, but I'm moving audio clips up and down to different tracks. For two of my sequences in a project, this worked fine. Now, some clips I move then show the audio (unlinked) as out of sync by very small (though inconsistent) sub levels (see image below).

<a href="https://images.creativecow.net/261923/image_20161107090858_1.png"><img src="https://i1.creativecow.net/u/261923/image_20161107090858_1.png" border="0" /></a>

If I undo, they remain out of sync. I don't understand why this is happening nor how to fix it. I haven't found much rhyme or reason to it, although I have had slightly better luck moving only one clip at a time (up or down tracks) rather than whipping a group of them together and moving them all. Also, in moving them, I'm using a keystroke so it's not "slight of hand" error. I'm sure it's user error but I'm not a pro audio editor by any means.

Thoughts?

Ramsey Productions, Ltd.
Design | Create | Produce
Complete Video Production & Marketing Services


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