Article View: comp.multimedia
Article #1147Re: MPEG for Mac?
From: John Lewis
Date: Tue, 17 Nov 1992 04:46
Date: Tue, 17 Nov 1992 04:46
25 lines
1693 bytes
1693 bytes
I have not heard of any MPEG hardware for the mac. R.e. the MPEG for Windows, I'm fairly sure that it's not what it seems: this software almost certainly decompresses from disk into memory, and then plays back from memory. Current processors are not fast enough to do JPEG in real time, and I don't think MPEG-1 is any near possible either. + This means that this "mpeg" is limited by the total amount of memory. Thus, the total length of the movie is limited (and some trade-off of movie length vs resolution vs frame-rate). It is thus somewhat inferior to software-only quicktime, which is not limited in length, only in size/rate. The closest thing to real MPEG in any commerical products are the JPEG-based Quicktime accelerators that are beginning to appear. These can do 640x480x24bit recording and playback at 30 frames/sec, *at some level of quality* (possibly no better than vhs). SuperMac's digital film ($6000) and RasterOps MoviePak ($2000 daughterboard) are the first two such products. A recent MacWeek article said that one quicktime hardware accelerator was used to produce a 1/2 hour show for public television in LA. They claimed broadcast quality using an 8:1 compression ratio. The show fit on 4G of disk.
Technical Details
Message-ID:
<1992Nov17.044659.20075@research.nj.nec.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!europa.asd.contel.com!darwin.sura.net!jvnc.net!nj.nec.com!zillaReferences:
<1992Nov14.233249.10301@nlm.nih.gov>Show Full Headers
Complete Article Headers
Newsgroups: comp.multimedia Path: arc1-ca.pugleaf.net!sparky!uunet!europa.asd.contel.com!darwin.sura.net!jvnc.net!nj.nec.com!zilla From: zilla@ccrl.nj.nec.com (John Lewis) Subject: Re: MPEG for Mac? Message-ID: <1992Nov17.044659.20075@research.nj.nec.com> Sender: news@research.nj.nec.com Organization: C&C Research Labs, NEC USA, Princeton, N.J. References: <1992Nov14.233249.10301@nlm.nih.gov> Date: Tue, 17 Nov 92 04:46:59 GMT Lines: 29