david, welcome. i had the same problem some time ago, and some others had, too. so this has been discussed a bit.
apparently, audio can be stretched in time to match, with corresponding slight change in frequencies. i don't remember the name of the effect. i did not use it. however video is at fixed frame rate, so stretching would require resampling (and thus probably result in some loss of quality, but i'm not quite sure). in my project, i chose the same solution that you suggest. if you have alternating video from 2 cameras, it is no problem to cut the clips where they are not seen. if the cameras have audio tracks as well, and if precision is important, you can align the sound waveforms to achive exact synchronization. look out for cracks or piano tones, they give clearly visible signals. if your extra audio track is of better quality than camera audio, you can still use those for visual alignment and then mute them before rendering, so only the best sound will be heard. cheers georg On Wednesday, 1. August 2007 04:21, David McNab wrote: > Hi, > > Suppose I've recorded simultaneously with 2 DV cameras and an audio mic > into the soundcard, and that these three sources are not electronically > synchronised (no SMPTE cables etc). > > Then, on loading the 2 video and the 1 audio track into Cin, and syncing > them up at the beginning to the clackerboard, I find that they start to > drift apart over time. > > What's the best way in Cin to overcome this? > > Should I (say) use the audio track as the baseline, and break up the > video tracks into small pieces, time-shifting them here and there as the > sync starts to drift? > > Is there a better way? > > Cheers > David > > > > _______________________________________________ > Cinelerra mailing list > [email protected] > https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra -- dr.k.g.hooss wissenschaftliche medienberatung tel. +49-(0)451-3003-474 www.schoepfung-und-wandel.de _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
