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Video/Audio Lost Sync during long compression
This is a new one for me and curious if anybody can shed some light on my situation. I have several 60 minute shows that I am going from:
640×360 FLVs compressed with H264
to
1280×720 MOVs also compressed with H264 at a much higher data rate
I’m doing this using compressor and find that by the end of the videos I can be off a/v sync by 3, 4, 10 seconds even. My only guess is maybe compressor could be dropping frames since the compressions take several hours (approx 6-10 hours each).
I’m redoing this, this morning without the upres to see if that could be causing the problem. Audio is set to 44.1/16 on both the source FLV and the MOV I’m making. Destination is Youtube for these shows, the main reason I’m recompressing a compressed file is youtube rejects the source FLVs with H264, it does however like FLV with On2VP6 (go figure).
Any help is much appreciated.
Thanks,
Chadwick
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2 Replies
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it may be obvious, but have you confirmed the 29.97 vs 30fps?
That may cause that kind of drift…
Just throwing out options.
-Jason
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The source was 30fps and I had the setting set to do same as source. I’m going to try again to force set it at 30fps in the new setting and see if that makes a difference.
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