Amiga movies possible on stock OCS machine?

[omnicron10]

I saw an A500 with 1 meg of ram with stock CPU playing at least 15 FPS HAM 348x240 animations at the World of Commodore Pasadena back in the day.  I guess it would have been 92?  

A company had a DMA HD sidecar and a A2000  card (same card) that could do this.  I think it was playing like Star Wars or something.  Looked great!

I want to say it was the Trifecta card by ICD.  

http://www.amiga-hardware.com/showhardware.cgi?HARDID=557

Link says it was IDE... wow.

FOUND IT!

http://www.amigahistory.co.uk/woc92.txt

"ICD was showing their new Trifecta hard drive.  It was running 4.5
minutes of Star Wars (where they escape from the Death Star)  Full
screen lores nolace HAM at 30 fps & audio on a stock Amiga 500 w/1Mb
of chip RAM.  The drive was transferring data at 1.9Mb/sec, total
size of video was 350K.  I honestly though they had a VCR plugged
into the monitor when I first saw it.  I had to walk around behind to
check if there was a composite connection.  I'd heard about these
kinds of demos before, but I don't think it really sinks in until you
see it in person." quote from Matt Davidian

[omnicron10]

Of course, in a 320x256 screen or whatever resolution it was, you figure a quarter of that size...not too demanding even for a 7mhz machine!

CDXL was 1/4 screen due to the fact the CD drive could only stream data that fast.  CDXL format was not limited to 1/4 screen.  Remember CDTV was 1x CD-Rom.

On CD32 you could a lot better CDXL animation.  

I think the CDTV had the best video play back from 1x CD on the market without MPEG.

[omnicron10]

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My idea was if you take a standard set of uncompressed frames that literally slot directly into screen memory to minimize the CPU bandwidth negating any decompression which you can then use for DMA transfers of the frame from your storage device etc. Hell compared to even Win2000 we are talking peanuts in file sizes really

Problem is, DMA is a hardware thing.  None of the 68000 socket HD controllers have DMA.  The CPU has to be involved.  The Zorro slot Trifecta card by ICD has DMA IDE support.  That is why it could do full HAM 30 FPS on a stock A500/A2000.

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So I guess what we are asking is...is it possible for the Amiga to load in 48k images of uncompressed HAM6 @ 320x200 in 1/25th of a second AND put them into the display area. I'm not fussed about compression in the era of HD drives being measured in Terrabytes on new PCs. Someone said the Blitter bandwidth for this is 2mb per second divided by 2 (need two channels for a straight copy) so it's almost there...technically.

On a non DMA controller stock OCS/ECS machine 68000?  Maybe.  With DMA?  Yes.  It has been done.