FORUMS: list search recent posts

Premiere Audio Sync Issue - Audio Time Units

COW Forums : Adobe Premiere Pro

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Peter Vandall
Premiere Audio Sync Issue - Audio Time Units
on Mar 6, 2017 at 4:45:05 pm

Hi All,

I shot an interview with a Canon C100 back in December. I had two channels of audio going into the camera. Boom and Lav. When I brought it into Premiere, I noticed an echo in the timeline. It sounds as if the audio is off by a few subframes. I did some digging and found out that you can switch the sequence to show audio time units. From there I was able to slip one channel of audio over at the subframe level to eliminate the echo.

Now I'm running into an issue where when I move that clip around in the time line to reposition, it goes out of sync again.
I've tried disabling audio time units, to go back to editing in the normal 24p mode, but nothing works.

I think it's a bug because I've been working on this project for a few months and it just started happening. I don't know if anyone else has run into this issue.

I'm running Premiere 2015.4 Release

Any help on this would be appreciated. Thank you.

Pete


Return to posts index

Dave LaRonde
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 6, 2017 at 5:42:00 pm
Last Edited By Dave LaRonde on Mar 6, 2017 at 6:31:08 pm

Any time you have two channels of audio, one from a lav and one from a boom mic, you're going to get a hollow sound. It can't be helped.

Disable one of the audio channels & play it with the video. Do the same thing for for the other channel. Are both lip-synced? If yes, there's no problem, and you're trying to correct something that doesn't need correcting.

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


Return to posts index

Mike Kelland
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 7, 2017 at 12:09:31 am

Hi Pete,

I've had this exact same issue for ages, and posted about it before with no luck. It's a bug - Premiere lets you slip by sub-frame amounts but then undoes the slip as soon as you move the clip on the timeline. Hugely frustrating as it used to work properly in the past. I'm on 2015.4 too - I downloaded the new Pr version onto my laptop and it has the same bug too. Would be great if someone from Adobe can chime in here.

Cheers,

Mike


Return to posts index


Jeff Pulera
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 8, 2017 at 3:43:48 pm

I'd seen this same issue, however it was with CS6. My fix was to make the audio adjustment using Audio Time Units, switch back to video frames view, then use the Razor tool to put a cut in the audio clip at a frame marker nearest the start of the audio clip. That seemed to keep things in sync then, otherwise the in-point of audio clip that I'd moved with Audio Time Units fell between frames.

Maybe this will help, worth a try

Thanks

Jeff


Return to posts index

Mike Kelland
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 8, 2017 at 7:45:25 pm

Hi Jeff,

Thanks - I think it's a separate issue though - what happening with us is we move/slip the audio by a subframe amount but then this action is undone as soon as you move the clip on the timeline.

If I move by subframe and then razor on the frame (back in frame mode) the audio (and it's waveform) reverts back to where it was before the move.

A way to test it is to find a video clip with lav mic and boom mic in perfect sync - switch to audio time units and slip one channel by half a frame, play it and you'll hear it echo. Now switch out of audio time units mode and then move the clip in the timeline and then play it again. It'll sound exactly as it was before you started - the half frame slip is undone.

Cheers,

Mike


Return to posts index

Jeff Pulera
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 8, 2017 at 7:59:35 pm

Hi Mike,

When I am doing this trick, usually it's a very long clip, for instance a wedding ceremony. Adjust once and forget it. Not sure why you are moving the clip though, having just done the work to sync it up? Guess I don't understand the workflow.

Here's a thought - sync the audio, then prior to moving anything, export as WAV audio. Put the NEW synced audio clip in the timeline to replace original, and in the new clip, the L and R tracks are permanently synced then. Nothing to slip.

Thanks

Jeff Pulera
Safe Harbor Computers


Return to posts index


Mike Kelland
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 8, 2017 at 8:14:22 pm

Hi Jeff,

Yes, that's the work around I've been using in the meantime - export a new audio file or send to audition etc. It would be nice to not have to do that though ☺

Reasons for doing it: where you have a lot of clips where the lav mic was recorded with a digital receiver with latency and you need to fix it to match the boom mic, matching a soundies audio file to be in sync with the camera audio if it's half a frame off, back-timing a music cue (taking out a verse for e.g.) and needing to slip by a subframe amount to get the beat right... the list goes on.

Or do you mean the reason I'm moving the clip? - by that I mean just normal timeline editing, moving the whole clip around the timeline. Nudging one frame is enough to undo the subframe audio slip.

It goes back to whether Adobe can reproduce this issue and whether it is a bug or not. If it's not a bug then they should put in the manual to export a new audio clip after sub-frame adjustments.

Cheers,

Mike


Return to posts index

Jeff Pulera
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 8, 2017 at 9:15:36 pm

I get it. And maybe my description of what I'd done in the past was not real clear. Assume start of audio clip is lined up with video clip. Then you go to Audio Units and nudge audio over a "partial frame". Go back to video frame units, zoom in where video clip starts, and razor cut audio to match start of video on the same frame tick mark. The audio offset would not then revert when moving stuff around. Again, this was with CS6 that I'd done this, maybe it doesn't work with CC.

Submit a bug report to Adobe

Thanks

Jeff


Return to posts index

Mike Kelland
Re: Premiere Audio Sync Issue - Audio Time Units
on Mar 8, 2017 at 9:33:09 pm

Thanks Jeff ☺

I reported the bug a year ago, and phoned tech support - it's just Peter and I seeing it maybe, so it goes to the bottom of the pile...

Maybe someone from Adobe is reading this and can help.


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]