Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rutgers!bobsbox!graphics!bobl From: bobl@graphics.rent.com (Bob Lindabury - SysAdm) Newsgroups: comp.sys.amiga.multimedia Subject: Re: DCTV digitized frames Message-ID: <34VB412w164w@graphics.rent.com> Date: 10 Jun 91 13:46:25 GMT References: Organization: The Graphics BBS (2D,3D,GIF,Animation) +1 908/469-0049 Lines: 42 James_Hastings-Trew@tptbbs.UUCP (James Hastings-Trew) writes: > I believe that GVP demonstrated about 3 minutes of full-motion video from > Back To The Future III running from a hard-drive using the DCTV unit. DCTV > frames present dramatic compression of images, mainly by reducing image > information down to what would be visible on a standard NTSC composite > display. A single DCTV frame can be 70K compared to the 24 bit original file > which can easily be over 1 megabyte of information. I once created a DCTV > anim which contained 60 frames rendered in Imagine at 736*480 in 24 bit > colour. Each frame was 1.2 megs in size - which reduced down to about 70K. > The entire anim ended up at 500K - less than half the size of one of the > original frames. There is LOTS of potential here. Actually, the demo wasn't GVP. It was done by IVS. It was Back To The Future III running from an IVS Grand Slam SCSI drive controller and a Seagate ST2383N 1.2 Gigabyte drive connected to an A3000 25mhz with 6 meg of ram. The video was played back through the DCTV in 3-bit color resolution in full overscan at 24 frames per second (true full motion video is 30 fps) with a video bandwidth of 12.06 mbits/sec. The audio was full 16-bit per channel digital with 44.1 or 48 Khz samples and a bandwidth of 1.54 Mbits/sec. The sound was 4 channel surround sound and the total runing time of the piece was 4 minutes and 30 seconds. Quite an impressive demo I assure you. You can easily see why it would be benificial to the Amiga community for a crossover DCTV product to be produced. The image while moving was *very* good. It was difficult to tell it was actually playing off the computer and not a laser disk. The image was *much* better than standard VHS tape as the actual resolution surpassed that of conventional VHS and of course, the audio was digital. -- Bob The Graphics BBS 908/469-0049 "It's better than a sharp stick in the eye!" ============================================================================ InterNet: bobl@graphics.rent.com | Raven Enterprises UUCP: ...rutgers!bobsbox!graphics!bobl | 25 Raven Avenue BitNet: bobl%graphics.rent.com@pucc | Piscataway, NJ 08854 Home #: 908/560-7353 | 908/271-8878