Video length does not match audio...


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Video length does not match audio...
by vinny dellay on Sep 1, 2009 at 7:49:56 pm

Hi there!

I'm having a problem that for the life of me I can't figure out.

I shot some footage on a Sony Ex1. The footage was shot at 23.976 g=frames per second. I import into Premiere CS4 without problem and do my editing. I then export the clips as uncompressed Quicktimes at 23.976 frame rate for color correcting in Autodesk Combustion 2008 (with the project settings at 23.976 frame rate). Once color corrected, I export the clips from Combustion (again as uncompressed quicktimes with 23.976 frame rate) and import to Premiere. Now suddenly, the video length is about 20% shorter than the audio. They don't synch u, but the footage is still at 23.976. I right clicked on the clip and used "Interpret Footage" command to make sure the footage was being interpreted as 23.976 ... and it is.

What is happening here??

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Re: Video length does not match audio...
by Tim Kolb on Sep 3, 2009 at 1:05:50 pm

Did you try to import the QuickTimes that PPro exported (prior to Combustion)?

If the QuickTimes that PPro is exporting load and function properly, but the exports from Combustion don't...then it's a Combustion issue.

If the QuickTimes that Ppro is exporting have the audio issue, then at least that removes Combustion from the troubleshooting process.

TimK,
Director, Consultant
Kolb Productions,

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Re: Video length does not match audio...
by vinny dellay on Sep 3, 2009 at 4:10:45 pm

Yeah, sorry... I should have mentioned that. When I reimport the quicktimes right back into Premiere (without Combustion touching them at all) I get the same problem. The quicktimes that I just exported do not match up with the clips in the timeline. They're all falling slightly behind... like the timing is off somehow...

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Re: Video length does not match audio...
by Tim Kolb on Sep 3, 2009 at 4:24:49 pm

OK...it's a PPro/QT issue then.

20% is a telling figure...the difference between 23.976 and 29.97 is exactly...20%

I wonder if there is a weird frame rate flag problem in the communication between PPro and QT?

What version of QT do you have? I need to find the requirement for CS4...not sure what version is minimum off the top of my head.

If you load the QT in QT player, does it seem correct?

If you try another QT codec, do you get the same issue?

I assume that Combustion reads the file as the right length...or is the error obvious in Combustion as well?

TimK,
Director, Consultant
Kolb Productions,

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Re: Video length does not match audio...
by vinny dellay on Sep 3, 2009 at 11:31:11 pm

Yeah, that's what I was thinking as well. It must be some kind of frame rate issue, despite the fact that I was being diligent about importing and exporting everything at 23.976.

Maybe it is a QT problem. When I get home tonight I'll see what version of QT I have installed.

Incidentally, I have exported QT's with a variety of codec and do get the same problem...

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Re: Video length does not match audio...
by Tim Kolb on Sep 4, 2009 at 1:17:14 pm

So...I guess it isn't the codec.

I would check out the movie inspector in QT player and see what it says about the file.

Also, it will be helpful to get the QT version...

TimK,
Director, Consultant
Kolb Productions,

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