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Audio Synching Issues

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nicholas bown
Audio Synching Issues
on Jun 30, 2010 at 4:35:39 pm

Hi Cows,

We have a very odd problem with a complex workflow hopefully someone can help with.

The workflow is below and the trailer that is being cut contains element as listed in the workflow.

1st Step

Xilisoft DVD Ripper

Video - Pal

720 x 480 - 720 x 576

Framerate up to 25 fps


This takes the DVD footage upscales it to 25 fps.

2nd Step

Create FC sequence @ 25 fps DV

Lay file into sequence and export to DV res 25 fps of ripped content to .mov file

This step makes the .mov file

3rd Step

Open Cinema Tools and choose File Batch Conform

Locate .mov and open choose frame rate 24 fps hit conform.

This downscales the 25 fps back down to 24 fps

4th Step

Open FCP Drag .mov into timeline in 24 fps project

Export using native project export settings with no changes.

So this part of the workflow makes the .mov in 24 fps

Audio Stage

1st Step

Digitize machine get OMF's from client source (CD or DVD)

Open Automatic Duck from FCP Import menu

Convert to DV Pal 48 khz 24 fps.

Automatic Duck places Audio into FCP

Manually line up video track in FCP

The video and audio is manually aligned so it is in synch.

The Quicktime files that the project is made of are all in synch. When previewed the audio appears in synch on dialogue but the sound effects line up perfectly. It is a bizarre problem.

The OMF's contain the elements and the Automatic Duck places them into FCP. The dialogue is a different track but why would the effects be in synch and parts of the dialogue are fine, it may be elements of the dialogue are ADR but they appear in synch fine in Quicktime, but not FCP output to a Plasma display.

The Mac Pro is part of a Fabric with dual screens attached to the DVI card supplied by Apple. A Blackmagic card puts the output to the Plasma.

Could it be anything to do with the Blackmagic card output? It is driving us all insane.


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Jerry Hofmann
Re: Audio Synching Issues
on Jun 30, 2010 at 8:05:15 pm

How do you know the source footage on the DVD wasn't 25fps?


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nicholas bown
Re: Audio Synching Issues
on Jul 1, 2010 at 9:30:00 am

Hi Jerry,

If it wasn't then it was as it is scaled up to 25 fps. If you read through the steps I outlined you'll see the work flow. It is then scaled down to 24 fps.

Thanks for your help, any ideas?


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