On Wed, Oct 27, 2004 at 10:06:42PM +0100, scott wrote:
> I don't understand when you say "You won't see comb effects on your
> TV-set"

It (the comb effect) will look different on a TV set than on a
computer monitor.  You can still see it if you know what to look for,
but the visual effect is different.  In many ways, it's by far easier
to perceive on a computer monitor.

> Although I notice today that the whole picture jumps up and down a small
> amount when played back VCR->DC10->xawtv and this vertical shaking is
> visible in the lavrec recorded avi and the encoded mpeg (on the computer
> and tv).  The video played back VCR->TV is steady.  Has anyone else had
> this?

This might be the source of your troubles.  It sounds like either
your VCR has some sync issues (or the tape itself is causing the VCR
to have sync issues) or else the timing signals coming from the VCR
during playback are outside the range that the DC10 can reliably lock
onto.  The digitizer chip on the DC10's is a bit particular about
having video signals that are quite close to "proper" spec and most
VCR's tend to be designed to play fast and loose with the sync
because most TV's are far more tolerant of out of bounds video sync.

There was a patch someone posted to the list a goodly number of
months back that enabled something that the spec sheet for the DC10
video digitizer chip called "vcr mode" or something like that.  The
spec sheet was mostly silent about what it really does, but it's name
implies that it's for use when capturing from VCR's, and likely it
just widens the acceptable range of sync values the chip is willing
to tolerate.  You might try searching the archives for that and
seeing if it helps your situation any.



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