Audio/Video out of sync when exporting to MPEG4

I am working on a project that is being edited on FCP 5.1.4
Anyhow, there is problem when exporting to MPEG4- the audio/video is out of sync.
Sequence settings show 29.97 editing base with 48 mhz sound, which is the same as the MPEG 4 settings, but they are not in sync. Anyone encounter this problem? I've never had this problem before previously.
Thanks
Caitlyn

Hi Harm,
last time you suggested the same but I wouldn't know how to take the BM card out of the equation. I only have on station. If I export to Beta SP there is no problem.

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iMovie Guru Lennart Thelander put together a pretty good list here:
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http://www.dvformat.com/htm/features/2000/800/dv_formatfaq.htm
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http://docs.info.apple.com/article.html?artnum=61636
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http://www.danslagle.com/mac/iMovie/audio/1001.shtml
iMovie: Improving audio and video synchronization
http://docs.info.apple.com/article.html?artnum=42974
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the audio and video content do not sync when exporting to media browser or quicktime.. at times the audio is delayed, or ahead of the video

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Sequence has a duration of 61 minutes and 38 sec. I tried to find out where's the problem and exported audio and video seperated. This results in:
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Audio is 61 minutes and 38 sec long
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What could that be ?

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Message was edited by: Anthony M Kassir MD

Video and audio goes out of sync when imported into Premiere

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Video info according to Premiere (in Spanish but you may get the meaning).
Ruta del archivo: [...].m4v
Tipo: Película MPEG
Tamaño de archivo: 667,7 MB
Tamaño de la imagen: 720 x 480
Profundidad en píxeles: 32
Velocidad de fotograma: 29,97
Formato de audio de origen: 48000 Hz - comprimido - Estéreo
Formato de audio del proyecto: 48000 Hz - Punto flotante de 32 bits - Estéreo
Duración total: 00:30:35:15
Velocidad media de datos: 372 KB / segundos
Proporción de píxeles: 0,8889

"HandBrake, these days, is almost entirely about H.264 video, aka MPEG-4 Part 10. HandBrake is migrating to quality-based encoding."
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Audio/Video out of sync when exporting to MPEG4

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