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- Newsgroups: comp.sys.amiga.advocacy
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- From: mlelstv@speckled.mpifr-bonn.mpg.de (Michael van Elst)
- Subject: Re: Comdex/Quicktime released for the PC
- Message-ID: <1992Dec31.232338.13654@mpifr-bonn.mpg.de>
- Sender: news@mpifr-bonn.mpg.de
- Nntp-Posting-Host: speckled
- Organization: Max-Planck-Institut f"ur Radioastronomie
- References: <1992Dec31.175534.4724@pcnntp.apple.com>
- Date: Thu, 31 Dec 1992 23:23:38 GMT
- Lines: 25
-
- In <1992Dec31.175534.4724@pcnntp.apple.com> Dale_Adams@gateway.qm.apple.com (Dale Adams) writes:
- >No, it doesn't do better than the Quadra. You're taking two entirely
- >different situations and comparing them. Show me an Amiga that can do 640
- >x 480 8-bit video animations at 30 fps when updating every pixel on every
- >frame. This requires a memory bandwidth of over 9 MB/sec. It's my
- >understanding that the A4000's (the top of the line Amiga) bandwidth into
- >chip memory is only 7 MB/sec, so it couldn't do this due to hardware
- >limitations.
-
- You forget that the Mac does not do that either (although it might be
- possible theoretically). The limit is currently not the bandwidth to
- video memory but the CPU that unpacks compressed video data.
-
- >Yes, what actually is the bandwidth into the A4000's video memory? If
- >it's not at least 9 MB/sec., the A4000 can't animate 640x480x8 at 30 fps.
-
- Fortunately, a 640x480 anim doesn't necessarily alter all pixels between
- frames.
-
- Regards,
- --
- Michael van Elst
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