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Qt in sync > Compressor > out of sync

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Richard Adams
Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 12:39:37 am

Just a few months with Apple, coming from Avid

Captured VHS tape and as always it is noisy and out of sync.
Adjusted audio and video tracks in FCP and created a QT movie.
Double checked the QT movie and it is in sync at 15, 30, 45, 60 and 75 minutes.
It is 95 minutes long.
Import the QT to Compressor and then the mpeg2 files to Studio Pro.
Compressor did a pretty good job cleaning up the noise, but the video
is out of sync. Compared the mpeg2 files from compressor and the audio track is 6 seconds shorter.

Suggestions??

Thanks.

Rick Adams


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Richard Adams
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 1:39:42 am

Well, I read everything I could find, but could not find a solution. I suppose I can use ProCoder 3, but I was hoping to make a 100% transition to Apple.

Rick Adams


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Loic de Lame
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 1:48:08 am

Out of curiosity, can you describe the settings or post pictures of the settings you used in compressor?

Mistyped on my iPhone.


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Richard Adams
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 1:56:19 am

Good evening, hello, and thanks for making time for my question,

I am using the standard 120 minute, best quality settings. The only change I made to the standard settings was the noise filter and cropping because of the analoge noise.

I am rendering another mpegs2 right now. I re-imported the completed QT back into FCP and exported as QT again. I know, silly, but when I had this problem on my PC's I had to fill the blank space created by putting the video and audio into sync, almost always 6-8 frames. I filled with a black still.

Again, thanks for offering your expertise.

Rick

Rick Adams


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Loic de Lame
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 3:36:43 am

Hmmm...can't say I've experienced this myself when working with VHS footage. Also sounds weird that the audio was out of sync when you captured, but maybe caused by the setup you have...

It sounds like you're doing things correctly. The only time I've experienced out of sync audio in DVD studio was when I cut the footage down within the program (sometimes) and/or when I was putting to shots/clips together back to back in DVD.

Right now not near a computer, but will look at some things tomorrow. The only thing I would suspect (and it doesn't sound like you're near these settings) is if the framerate is off because compressor or FCP is retiming it.

I suppose this is NTSC footage? And since it's VHS, has to be 29.97 (or 25 in PAL)...

Mistyped on my iPhone.


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Richard Adams
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 4:02:18 am

Thanks. yes, NTSC. It is almost finished re-encoding. I'll know in another hour or so.

Rick

Rick Adams


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Richard Adams
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 5:06:05 am

OK, it is still 6 seconds off.
Now I suppose I will delete the video
track in FCP and just export the audio
track and see if it is the same length.

Rick Adams


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Richard Adams
Re: Qt in sync > Compressor > out of sync
on Aug 8, 2010 at 5:18:39 am

Oh well.
Time for bed.

Rick Adams


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Loic de Lame
Re: Qt in sync > Compressor > out of sync
on Aug 9, 2010 at 2:25:11 pm

Hello.

You've probably found a way around your problems with the MPEG2 files.

I'm still a little curious. Quick question is what audio format you're going from and to. Is your final out an AC3, AIFF....
And what sample rate the audio is at throughout the project.

The other question I have is if the audio drifts out or if it's consistently x amount out of sync.

The only thing, after looking around and mulling this over, that I can think of that would cause this would be an audio sample rate issue of some sort. And since you're creating the mpeg files in compressor, that means that DVD studio isn't touching them to make them ready for dvd. It's only muxing them.

Again, not a huge deal if you've solved your problem, but I'm curious if there's a specific reason for this issue.

~ Loïc


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Richard Adams
Re: Qt in sync > Compressor > out of sync
on Aug 9, 2010 at 5:37:17 pm

Good morning,
I always ... always had this problem with Avid when
capturing from VHS tapes. I just assumed it it inherent
with analogue. With Avid I would import the captured
avi file and make my adjustments to bring it into sync.
Then I would place a still image, usually a black color
clip in the empty space or just cut which every track
was the longest in the beginning and ending.

It always always happened with clips over and hour.

I would re-encode the timeline with the adjusted clips
and then make my mpeg2 in ProCoder3.

I can still do this, I was just hoping to eliminate one
computer from my desk.

As for Compressor it created the standard AIFF audio file,
but I will surely pay attention next time my wife or clients
wants a VHS to DVD conversion.

Thank you for your input and time.

Rick

Rick Adams


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