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- Path: nj5.injersey.com!jeremyn
- From: jeremyn@nj5.injersey.com (Jeremy )
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Variable speed PAL video
- Date: 15 Mar 1996 22:10:30 GMT
- Organization: Asbury Park Press
- Message-ID: <4icpsm$otr@news.injersey.com>
- References: <4iao6o$l1a@gossamer.itmel.bhp.com.au>
- NNTP-Posting-Host: nj5.injersey.com
- X-Newsreader: TIN [version 1.2 PL2]
-
- John Scheermeijer (scheermeijer.john.wj@bhp.com.au) wrote:
- > Nowadays everyone, Amiga Technologies included, seems to be pushing
- > digital video, MPEG etc., for all it's worth. However, I see the main
- > strength of the Amiga technology as being it's compatability with the
- > still prevelant video standards. For a relatively small outlay on a
- > genlock and some public domain software, one can achieve have a fairly
- > impressive desktop video setup.
-
- > I believe there is still a long future for analogue video and wonder
- > whether there are any people out there that are working to capitalise on
- > this unique strength of the Amiga technology.
-
- > If I recall, video laser disk technology (ie. the large disks ) is
- > analogue based. Has anyone tried to adapt this technology or the VHS tape
- > based technology for variable speed play back (ie. noiseless)? I realise
- > the associated monitor's screen raster rate would need to be changed in
- > synchronism. I would have thought that an Amiga genlock could be designed
- > to cope with this form of operation without to much difficulty and that
- > this new form of operation could lend itself to many useful applications.
-
- > Any thoughts?
-
- > John Scheermeijer
-
- Variable speed video playback is possible with professional-level video
- decks equipped with dynamic tracking. A deck like that will put out a
- stable video signal at all speeds, so no adaptation of the genlock is
- necessary, nor is changing the scanning rate of the monitor. Watch that
- clean slo-mo on the Superbowl or the Olympics--that's how they do that.
-
- These decks are expensive, needless to say, but there's no new technology
- involved.
-
- Cheap hack: find a VCR with frame-by-frame slow-motion playback (present
- on many consumer decks). This is not a stable video signal, and will flip
- out your genlock and possibly crash your computer. But, run the signal
- through a full-frame time-base corrector, and hey presto, it's stable! Of
- course, you see the chink-chink of the frames going by, but it'll cost
- thousands less.
-
- Jeremy
- jeremyn@injersey.com
-
-