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.dv to .mov audio drift issue
Has anyone noticed when converting .dv to a dv quicktime there is a drift in the audio? The sync is dead on with the .dv and a few frames early progressively getting worse. If I render the .dv audio in FCP the resulting audio file is in sync….in compressor or quicktime or episode i have the drift.
Anybody ever run into this…I’d love to use a batch type program b/c I have a number of files rather than fcp.
Thx
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7 Replies
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the sample rate for the .dv clips are:
DV 32 kHZ
32 bit floating point
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I’ve tried 32kHZ out of streamclip with the same results. 🙁
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I believe this may be my issue:
This FAQ https://www.adamwilt.com/DV-FAQ-tech.html states that consumer DV cameras produce unlocked audio and that any NLE that treats the audio and video as separate tracks (such as QuickTime based products) needs to understand how to re-clock the audio. Apparently FCP does this and it appears that iMovie 09 does not. Can anyone confirm if Final Cut Express 4.0 re-clocks the audio to keep the audio and video in sync?
Are there any programs that reclock audio via batch?
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saving as in streamclip just basically changes the extension. The audio is still DV audio which needs to be rendered.
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Saving in QT rewraps the file as QT.
Unlocked audio shouldn’t be an issue.
The drifting of unlocked audio in a one hour file would be unnoticeable for the human hearing, up to SONY.
The problem with “.dv” (DV stream), is not that treat audio and video as separated tracks (as QT files does), but as separated files packed together.
rafael -
I just find it odd that the .dv file stays in perfect sync while any type of quicktime conversion other than a rewrap causes the drift to the point of it being unacceptable after a two hour capture.
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