Posted by George Hammond on 10/13/05 11:06

On Thu, 13 Oct 2005 10:49:37 GMT, George Hammond
<ghammond1@earthlink.net> wrote:

>On Thu, 13 Oct 2005 11:46:00 +0200, "erik" <erik@somewhere.com> wrote:
>
>>"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, George Hammond
>
>>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.
>
>[Hammond]
> Erik.... thanks for responding. I am a physicist, who discovered
>this idea, but I know beans about practical video stuff. This idea
>has been widely discussed on the physics newsgroups, but none of them
>know anything about practical video matters.
> If it works, it may point the way to making "childproof X-rated
>entertainment".... think about it... the amount of programming
>effected on public t.v. would be enormous. Big bucks!
> Of course the idea I'm proposing here is just a "simple experiment"
>to try and find out something about the phenomenon.
>
> The problem with AVI, MPEG and other "computer" video systems is
>that most people (including me) are using old 200, or 400 mc CPU
>computers with run of the mill graphics cards... and they are just too
>slow.... they "compress" the frame rates unpredictably.... AVI only
>runs at 12 frames/sec on my computer for instance. This will
>OBLITERATE the effect which depends on running at
>TRUE 30 FRAMES/SEC VIDEO SPEED (like t.v.) !
>
>As I see it, the only way I can GUARANTEE that the video is actually
>running at "true 30 frames/sec" speed is to do the experiment using
>VHS video on a VCR.
>
>CORRECT ME IF I'M WR0NG ABOUT THIS....!!
>
>Isn't there some way to "edit" a vido on a computer, and then load it
>on to a VHS tape?
>
>You do see what the problem is, right? I have to be SURE the vido
>that I produce is actually running at 30 frames/sec...!
>
>George Hammond

[Hammond]
PS:

What about these new graphical "video editing" programs I see
advertised online in which al lyou have to do is "cut and paste" or
"drag and drop" individual frames in the video editor to make an
"edited" version of a vieotape or video file. Seems to me that
"writing a script" is kind of an old fashioned approach given the
proliferation of these new graphical interface video editing programs
that are floating around? Some of them are even freeware.

George

[Back to original message]