I am working on a project with 55 DV tapes, roughly half of which originated (I believe) with a Canon camera with the 48009 constant audio bit rate problem. (variously reported as 48005 to 48009 on the internet) What that means is if you view the DV file straight the A/V sync is fine. But if you split out the A/V streams, compress, and join them back together you end up with a slowly increasing A/V sync problem that starts to be noticable after 15 or 20 minutes. I'm having an incredibly difficult time trying to compress these broken files because most tools assume the audio is to spec and is 48000. And they won't let you override the spec 48000 with 48008. I've managed to split out the audio stream using ffmpeg to a wav file, then use ecasound -ei to alter the length of the file, but ecasound's -ei parameter doesn't hold enough precision for the very small (but absolutely critical) adjustment I need ( -ei 100.018141% ). I don't know how to resample between 4800x and 48000 because the audio file split out from the DV file claims it is 48000 already. I would GREATLY appreciate help. This is beating me to a pulp! For a reference see http://www.adamwilt.com/DV-FAQ-tech.html#LockedAudio "This was revealed at NAB '99 by Randy Ubillos, lead engineer on Final Cut Pro, who has found that while most DV cameras are pretty good, Canon cameras grab 48kHz sound at around 48.009 kHz, which can result in almost a second of video/audio slippage over the course of an hour (or around one frame every two minutes)." THANKS Heitzso