[MEncoder-users] is this possible

[Reimar Döffinger]

On Sun, Feb 27, 2011 at 01:06:00PM +0000, Daniel Harris wrote:
> I am trying to record some vhf tape to dvd but after trying what seems
> like hundreds of combinations I still end up with a/v sync issues.
> Over an hour the sync only seems to go out by about 100ms so I was
> thinking about recording in 5 to 10 minute intervals and then cutting
> and splicing the whole video back together again using scene changes
> as markers.  Is that possible and is there a way to make mencoder
> record for 5 or ten minutes and then fire up a second instance say
> about 30 seconds before the first one ends.  I guess this would
> require some sort of shell script?
> 
> Would this be the best way to do this or is their a better way?

What is your recording setup? This sounds like the audio and
video capture use different clocks.
I think there are only two mostly working solutions:
1) Get a capture solution that uses the same clock/quartz for
   both audio and video.
2) Use -af scaletempo to slightly adjust audio speed up or down
   to match the video. Not that for quality reasons I'd normally
   suggest to just tweak the fps value, however if you want to
   go to DVD you probably have no choice there and then adjusting
   audio should work better than dropping or duplicating frames.