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Author Topic: A/V sync problems  (Read 8542 times)

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Offline beatkilla

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Re: A/V sync problems
« Reply #15 on: December 23, 2013, 10:39:55 AM »
2 words..  Plurel Eyes.  Get it.   ;D

Last i checked plural eyes did only synch at one point and not take into account for drift has this changed now?

Offline willndmb

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Re: A/V sync problems
« Reply #16 on: December 23, 2013, 10:55:48 AM »
2 words..  Plurel Eyes.  Get it.   ;D

Last i checked plural eyes did only synch at one point and not take into account for drift has this changed now?
same wih fcp I believe
I just got fpcx recently and when I used the built in synch/mutli mix it was on at the beginning but not the end
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Offline yousef

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Re: A/V sync problems
« Reply #17 on: December 23, 2013, 11:35:48 AM »
Last i checked plural eyes did only synch at one point and not take into account for drift has this changed now?

Really??? I just assumed it was one-stop solution. That's a shame - finding a single sync point seems to be easy enough, it's the stretching and checking that sync is maintained that takes all the time...

I guess you could just chop all your video clips into 10min chunks and let Plural Eyes sync them up to work around this.
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runonce

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Re: A/V sync problems
« Reply #18 on: December 23, 2013, 02:11:31 PM »
Last i checked plural eyes did only synch at one point and not take into account for drift has this changed now?

Really??? I just assumed it was one-stop solution. That's a shame - finding a single sync point seems to be easy enough, it's the stretching and checking that sync is maintained that takes all the time...

I guess you could just chop all your video clips into 10min chunks and let Plural Eyes sync them up to work around this.

I think  the problem with the "chop and sync" is - you are syncing 2 sources that aren't in tune with each other...(if drift is the issue)

Offline yousef

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Re: A/V sync problems
« Reply #19 on: December 23, 2013, 02:14:45 PM »
I think  the problem with the "chop and sync" is - you are syncing 2 sources that aren't in tune with each other...(if drift is the issue)

But I generally only have one audio track running in the final video - I use the audio from each cam as a means to sync and then mute all but the separately recorded audio when everything is lined up.
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runonce

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Re: A/V sync problems
« Reply #20 on: December 23, 2013, 02:31:22 PM »
I think  the problem with the "chop and sync" is - you are syncing 2 sources that aren't in tune with each other...(if drift is the issue)

But I generally only have one audio track running in the final video - I use the audio from each cam as a means to sync and then mute all but the separately recorded audio when everything is lined up.

Ah...10-4

Offline Gutbucket

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Re: A/V sync problems
« Reply #21 on: December 23, 2013, 03:32:32 PM »
I think  the problem with the "chop and sync" is - you are syncing 2 sources that aren't in tune with each other...(if drift is the issue)

But I generally only have one audio track running in the final video - I use the audio from each cam as a means to sync and then mute all but the separately recorded audio when everything is lined up.

In that case any minor non-linearities which remain between the files after one global sync-stretch (not chopping, but just stretching/shrinking the full length file) shouldn't be of consequence.  Using the video from one source and the audio from the other, you only need the sources synced closely enough to eliminate visible 'lip-sync' problems, rather than needing to get them close enough to avoid phase-related problems when mixing the two audio sources.  The first has a far greater tollerance for mismatch than the second.
« Last Edit: December 23, 2013, 03:38:42 PM by Gutbucket »
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Offline yousef

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Re: A/V sync problems
« Reply #22 on: December 23, 2013, 03:46:35 PM »
In that case any minor non-linearities which remain between the files after one global sync-stretch (not chopping, but just stretching/shrinking the full length file) shouldn't be of consequence.  Using the video from one source and the audio from the other, you only need the sources synced closely enough to eliminate visible 'lip-sync' problems, rather than needing to get them close enough to avoid phase-related problems when mixing the two audio sources.  The first has a far greater tollerance for mismatch than the second.

This is true - and reflects my usual workflow. Having said that, the idea of chopping the video into chunks and letting a program line them all up does sound tempting when compared to some of the trickier experiences I've had when trying to stretch files.
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Offline techgui

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Re: A/V sync problems
« Reply #23 on: December 23, 2013, 05:13:23 PM »
OK, I put everything back on the time line today, synced the start points and found that after 47 minutes, the drift is 82ms not 3.4 seconds.  Still large enough to hear two distinct clicks, but nowhere as bad as I originally thought.  Don't know how I screwed up the original numbers. 

Just received my PluralEyes software.  Works great.  I just threw the (3) camcorders and the board audio into vegas and let PluralEyes sync everything up.  Then I went back and used Crtl/drag to adjust the end of the soundboard audio to sync with camera 1. 
« Last Edit: December 26, 2013, 08:24:32 AM by techgui »

 

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