On Wed, 8 Nov 2006, Michael Hanke wrote:
> I have another capturing problem with very old VHS tapes. I am using a Canopus
> ADVC-55 for capturing to PAL-DV. Even if my tapes are very old, I do not have
> any problem with lost frames, drops outs etc. My problem seems to be a
That is because the Canopus never lost the sync burst.
> synchronization issue of the individual scan lines. In some frames, the two
> different fields (VHS is interlaced) are shifted by a visible offset. When
> viewing the movie seems to jump back and forth. The link below shows two
> examples:
IF those images are from 'still scenes' (no motion) then the problem
looks to me like the usual poor mechanical/video stability of VHS.
Could be anything from physical damage to the tape to mistracking (worn
heads in the VHS) of the tape. It's possible for the signal on
the videoutput to be "sync"able but the video data to be mangled - thus
the Canopus won't lose sync but the image will be unstable.
> How can I repair these frames? Probably the best solution would be a hardware
> TBC, but I do not have access to one. Do you know about a software
Nothing that money can't fix :)
But if the data is on the tape that way then there's nothing an
external box can do. If the Canopus isn't losing sync then there's
a good chance that's how the video is present on the tape. Maybe a
better VCR could track the tape better, but I'd guess not.
You might try, and I'm sure they're available in Europe (but if not
www.bhphoto.com can ship internationally), something like the Sima
CT-2
http://www.bhphotovideo.com/bnh/controller/home?O=Search&A=details&Q=&sku=313143&is=REG&addedTroughType=search
US$65 is a lot cheaper than a TBC.
> PS. The samples above are chosen because they show the effect rather clear,
> not because the movie is worth the effort :-) M.
:)
You might try putting the data thru the new and improved deinterlacer
and creating a progressive stream. Maybe that will 'blend' the two
fields together into a more stable image.
Cheers,
Steven Schultz
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