|
Subject: AVI can be uncompressed....
Name:
Celstk855
Date: 6/1/2001 9:44:34 PM (GMT-7)
IP Address: 210.84.108.176
In Reply to: How to I cap uncompressed? posted by
Ben
Message:
some arent - eg: MJPEG avis and cinepak, blaah..blah..blah...
anything >360x240 (NTSC) or 352x288 (PAL) uncompressed cant be done unless;
1. you have an ATA100 on a RAID and that will only just do Huffy luminance compression at of 704/720x756 (PAL) 20MB/sec sustained.
2. Otherwise if you want 640x480 or 720x576 uncompressed 24bit RGB, then you have to have a SCSIIU2W setup....forgetit 'cause that equates to ....720x576/48 x25fps/30fps/24bit per pixel...=29.7MB/sec
No compression is best for quality, but there/'s very little need for this extreme , unless you have a film feeder for your computer which will feed high res feed to your PCI bus.
MPEG1/2 is a final "storage and display" compression too...try editing and recoding some MPEG1 stuff to a similar res and you'll see more and more artefacts...usually you need a splitter and joiner for this stuff...
Matrox and some other manufacturers make MJPEG compressor boards with a realtime chip for $150 and the quality is good enough for beginner to advanced home users.
I make miniDVD footage with my setup and the final product on a 28" TV its as good as any original broadcast. Even good MPEG-1's in VCD format (170KB per sec) look and sound better than VHS if you can get it right.
Realtime MPEG2 conversion will not be as good as hardware codec until you get another Gig or two of processor headroom. I've tried some of the software compressors and found them to average at best and an order of magnitude less in quality than slow encode software stuff at 10xrealtime on a PIII800.
my 2c
|