What's your video source and size when converting with SMC that syncs audio/video real well?

[clipuser]

I usually use mencoder to encode everything to 20fps 224x176 mpeg4 plus 128kbps cbr mp3 and drop that to SMC, as the first step can be done unattended from a script.  I never saw gross a/v offset in the result produced this way, but SMC hangs perhaps 1/3 of the time (which does not have anything to do with your question).