Yes, the YT video on syncing was included in the blog post I linked.
As far as video quality after the render, that depends a lot on how the render is specified. I don't have Avidemux on my system these days, but there were lots of choices for output format/codec and levels of quality. A 2 pass x.264 render at 1000 mbps or so should give output indistinguishable from the input.
I think Windows Movie Maker does sacrifice quality, but I've never made more than cursory use of it.
I'm doing a quick tutorial on Shotcut, it's looking pretty decent and I'd definitely recommend it over Avidemux or WMM.
Video is just annoyingly complicated, I'm afraid.
Fran
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