Video/Audio out of sync / stutters at start and then jumps back into sync.

Question

Video/Audio out of sync / stutters at start and then jumps back into sync.

Everything appears fine in the Simulator and when played in the computer. However I have noticed on 2 different DVD Players that when the video starts the audio is out of sync for about the first 20 sec or so and then slides back into sync for the remainder. Seems to sort of lag.

I am exporting NTSC videos out of FCP and encoding via Compressor. I am using the Compressor presets (usually 120 min Fastest Encode).

Anyone see this before?

G5 1.8GHz / MacBook Pro 2.16GHz Intel Core Duo, Mac OS X (10.4.8), FCP 5.1

Posted on Jan 28, 2009 9:43 AM

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Answer 1

Jan 28, 2009 11:25 AM in response to revolutionmedia

If you buy/rent any DVDs you will find that they all put a couple of seconds of black at the start of their main track. The reason; DVD players need a couple of seconds to figure out what sort of audio they are playing (ie., stereo, 5.1, DTS, etc.) Put a slug at the start of your video in FCP.

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Answer 2

Jan 28, 2009 12:05 PM in response to Shawn Birmingham

interesting. But would that make since as the out of sync lasts 20 sec as opposed to just 2-3? i'll try it. Thanks

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Answer 3

Jan 28, 2009 6:10 PM in response to revolutionmedia

Fixed. There was 5 sec video clip that plays before the main video in the track. However, the 5 sec clip was video only, not audio, and was as a .mov as opposed to mpeg2. Anyways I encoded the 5sec clip in mpeg2/AAC and added it before the main clips and everything works. Still don't know WHY it happened and why it stuttered, any ideas? Don't think it was the lack of black at the start as i didn't add any.

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