Posted by erik on 10/13/05 09:46

"George Hammond" <ghammond1@earthlink.net> wrote in message
news:900qk1lvm0emqug9j057e6k3uvdokbj13i@4ax.com...
> This is a research question.
>
> I want to make a video which will be "invisble to kids" but
> "visible to adults".
>
> Theory says this is possible because the PFF
> (picture fusion frequency) of adults is around 15 frames/sec,
> while the PFF of a 7 year old kid is only 10 frames/sec.
>
> OK, I can't use AVI, or MPEG or any kind of
> "computer video" system because they are too slow
> and tend to compress frame/rates unpreditably....
> I have to use good old fashioned VHS tape and
> play it on a VCR.
>
>
> QUESTION:
>
> How can I most simply EDIT a VHS tape?
>
> What I want to do is take "any ole" average VHS
> movie tape, and simply REPLACE some frames on
> it, and then play it on my VCR.
>
> How can I most EASILY do this?
>
> Specifically, if I have a regular VHS video movie,
> I wish REPLACE every 3rd,4th,5th,6th
> frame of the video with "blank" frames
> (say colored light gray)... so the tape will
> look like this:
>
> 01|02|...|...|...|...|07|08|...|...|...|...|13|14|...|...|...|...|19|20|...|..|...|...|25|26|...|...|...|...|-------etc,etc,etc------>
>
> the |...| frames have been REPLACED in the original video
> with these new "blank" (light gray) frames.
>
> HOW CAN I DO THIS.... what type of equipment, computers, VCR's
> etc do I need to do this?
>
> Could a run of the mill commercial video lab alter a VHS tape
> for me in this specific way?
>
> Thanks in advance, Ted

I think that trying the "computer" way is worth a shot. You can write
an AviSynth script that would blank the frames and then encode the
result to mpeg. I think you can even force I frames to be at the
significant frames.

Erik.

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