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- Path: sparky!uunet!dziuxsolim.rutgers.edu!psi.rutgers.edu!ib.rl.ac.uk!CDO
- From: CDO@IB.RL.AC.UK (C D Osland)
- Newsgroups: comp.graphics.visualization
- Subject: Re: Recording animations
- Message-ID: <9211110425.AA25602@psi.rutgers.edu>
- Date: 10 Nov 92 18:40:42 GMT
- References: <jamison@EDU.COLOSTATE.ACNS.YUMA>
- Sender: nobody@psi.rutgers.edu
- Lines: 43
-
- On 10 Nov 92 15:16:50 GMT <jamison@EDU.COLOSTATE.ACNS.YUMA> said:
- >In article <1992Nov4.073034.14032@tpts1.seed.net.tw> idpt249@tpts1.seed.net.tw
- > writes:
- >>About recording animations, I got few words to say. We've been using betacam
- >>for a while. But gradually I cannot stand the low speed of pre-roll. To
- ... lines deleted
- >
- >I know of at least three ways that recording can be speeded up:
- >
- >1. Get a frame buffer that stores multiple frames that can be recorded
- > with only one preroll. Examples: Tektronic's Avanzar (4 frames),
- > Abekas A60 (I think a couple seconds or real time play back).
-
- The Abekas A60 is a video disk recorder; default storage is 750 frames
- (30 seconds) in PAL and <<I think>> 25 seconds in NTSC ... yes, I know
- that also makes 750 frames, but the frames are different sizes in
- kilobytes in the two systems. Unlike the (optical) recorders
- mentioned below, quality is 'perfect' - unless you want 10 bit per
- pixel or HDTV spatial resolution.
-
- >
- >2. Use edit controller equipment that lets you record say every 30th or
- > 60th frame (however long it takes for you to load the next frame).
- > If you have the frames stored on disk you can then record every
- > 60th frame to the end of the tape then go back 59 more times to
- > record the rest. This can be a problem with networked disks because
- > of variable read rates.
-
- This can also be a useful technique if you are recording a cyclic
- animation - eg the beating of a heart.
-
- >
- >3. Use a video disk recorder instead of tape. However, quality is
- > subject to debate (we definately debate it here but we still use one).
-
- I note that the cost of some (optical) video disk recorders is coming
- down a bit; the LVR-6000 (PAL) was $(UK)18,000; a somewhat improved
- unit - the LVR-4000 is about $(UK)11,000 this week - 15% more next
- week as a result of currency fluctuations.
-
- Chris Osland
- Atlas Video Facility
- Rutherford Appleton Laboratory, UK
-