filtering out frames impacted by lost vertical sync

[gvm]

I need to restore some damaged VHS video. The result of the damage is lost vertical sync, so the affected captured frames comprise partial successive source frames separated by a green horizontal line. The position of the green line varies.

Can anyone share their approach to correcting this problem please?

thanks,
Greg

[rernst]

Hey,

I have exactly the same problem. I tried playing around with Motionperfect to have the two damaged frames tweened from the surrounding ones. But somehow, when I select the method to remove the frames, Motionperfect removes the whole clip ;-)

I things would work if I could just remove the two frames (actually remove them by changing the timestamp of the following one), not replace them with black as if I remvoed them via an editing program like Premiere or Mediastudio.

I have scoured the net high and low and found nothing.

[gvm]

hey thanks for the reply. My conclusion from lack of discussion on this topic is that there isn't a satisfactory video-editing solution ... that my effort is best spent trying to improve the quality of signal captured from the VCR heads. Does anyone know of a forum where altering/adapting VCRs is discussed?

[vidiot]

I would try to put that question in the Avisynth Forum...
Even better if you provide a small clip (already digitized) that shows
the problem.
I´m pretty sure the people can help, but in my imagination it sounds like "There is no good automatic solution".

I´m not sure but maybe you can process every frame via a connection of premiere and photoshop? With a color mask in photoshop and a scipt for resoring the area that formerly was a green line...

I know that it´s possible with single frames...

Good luck

[ntojzan]

This sounds like an interesting problem, could you send a few frames to me? I think there is no authomatic solution, but I also think that I might be able to write a program which will fix this error by interpolating pixels at the green line, or something like that, however I'd like to see how it looks like. (at least 10 frames)

[gvm]

frames are available for viewing at http://www.techmastery.com.au/greenbar.htm

[scharfis_brain]

provide a sample clip, which contains some good frames before and after those affected scene.
the clip has to be untouched (no [vertical]resizing, deinterlacing or whatever filtering at all)

but as we said on neuron2.net, there only are few chances getting this thing restored.