This is off-topic to the Variable frame discussion, but worth answering r3consulting's problem - there are 2 different types of DV capture. DV isn't a variable frame rate format, but the 2 types of DV AVI files store the audio and video in different ways. One creates a single audio/video interleaved "stream" within the AVI file. The other stores the audio and video separately in the file, as 2 separate streams. This second variant always had sync trouble for files longer than about 30 minutes. Shouldn't happen if you capture DV QuickTime, or set the AVI capture to Type 1. Here's Wikipedia's answer on the matter: " DV-AVI is Microsoft's implementation of DV video file, which is wrapped into an AVI container. Two variants of wrapping are available: with Type 1 the multiplexed audio and video is saved into the video section of a single AVI file, with Type 2 video and audio are saved as separate streams in an AVI file (one video stream and one to four audio streams). This container is used primarily on Windows-based computers..."
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