On Fri, Mar 31, 2006 at 10:26:01AM +0200, [EMAIL PROTECTED] wrote:
> OK, SVHS probably isn't the thing I need because my VCR is only VHS and a
> cable won't make it better ;-(
>
> I'm nearly at the point to try to write a deinterlacer which fits
> the 2nd field into the 1st one by x/y-shifting it. Needs motion
> search. But this would be a workaroud, not a fix. I would really
> prefer to solve the problem, but I don't know what causes it.
Could it simply be a very slight timing difference beween the VCR and
the proper frame/fieldrate for PAL?
Several months ago I tried doing some NTSC capturing (using a cx88
device and mencoder) from a fairly high-end consumer VHS deck and
outboard comb filter. There were problems. In addition to the
occasional dropped frame, if I looked very closely at a captured frame
with matching fields I could see that the scanlines were slightly
misaligned. The misalignment was by different amounts in different
parts of the frame, and I'm pretty sure it changed every time I
recaptured the same sequence.
I upgraded to a professional VCR with S-Video output and an internal
time-base corrector, and the timing problems seem to have disappeared.
Unfortunately this might be an expensive solution and there's still no
guarantee it'll solve your particular problem.
-Dave Dodge
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