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Article #71892

Re: More On Video Capture and its Constraints

#71892
From: David Longley
Date: Wed, 08 Nov 1995 00:00
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In article <815786719snz@c4rv.demon.co.uk>
           raj@c4rv.demon.co.uk "Rajesh Varia" writes:

> I've not used the card mentioned but judging by the ad, the card does
> mjpeg compression.  If this is hardware, then processor will not
> make to much difference, I have capture systems based on a 486dx2-66
> but with a Card that has a hardware compression.  If the card does the
> compression with software, then the processor can make a big difference.

The card got a very good review in PCW back in April this year. If I
change the colours down to 256, real time display looks OK, so it must
be the data load. (The complementary colours in 1/2 and 1/4 scren mode
are puzzling though). The problem does not seem to have changed from
when I used a 486-33Dx --> P24T-S (83MHz) --> 120 MHz Pentium. Yet the
upgrades have trippled then doubled again processing power. It seems
odd to build a video card which is ISA in the first place really, 
I would have thought it would at least have been VLB.
> 
> Of course you might also wish to switch to SCSI as the faster drives 
> generally come out in this format (ie all 7200 rpm drives), plus you
> can get drives bigger than 2 gig.
> 
Yes, I am saving a 25 minute video clip now. I'm using an EIDE 1.2 GB
Conner drive. The conversion to AVI (non mjpeg for transportability),
the source file was 520MB and estimate was 16 hours to make the output
file! 

That's why I'm after a 4GB AV class SCSI-2 drive, but I'm looking to pay 
under 600 for one, no more tan 550. So if you know of anyone selling one
let me know.


> As the question of the video card, this depends on format of the
> video file. Again if your video card has hardware acceleration
> for the standard being used (and DS 64 Video VRAM does NOT support
> mpeg in hardware) your processor may be the limiting factor.  If
> there is an option to switch of the capture windows when actually
> recording, try it.

Yes, I'll try that, but it seems to stop when capturing anyway. It's
all rather odd as I set it to 15 fps! Perhaps all will be clear after I
call that number tomorrow....

> 
> Finally get a copy of the November issue of PC Pro as they a multi-page
> feature on video editing.

I'll try and get hold of that (but suspect most places will be selling 
December's now). Don't throw it out though!

-- 
David Longley
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From: David Longley <David@longley.demon.co.uk>
Subject: Re: More On Video Capture and its Constraints
Date: 1995/11/08
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references: <815753545snz@longley.demon.co.uk> <815765261snz@c4rv.demon.co.uk> <815781099snz@longley.demon.co.uk> <815786719snz@c4rv.demon.co.uk>
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