Steve Baker (steve++at++mred.bgm.link.com)
Wed, 29 Jan 97 10:03:26 -0500
I'm trying to videotape some of my normal 1280x1024/60Hz simulations.
When I set up ircombine on my iR box for 1280x1024 (60Hz) on one
DG-2 output and NTSC on the other, I see an occasional horizontal
discontinuity creeping up the NTSC display - no such artifact
appears on the regular display.
This looks like the kind of thing that you might expect if the
buffer swap wasn't correctly sync'ed to the vertical retrace.
When I check the frame rates in ircombine, it says that my
1280x1024 channel is running at 60Hz and the NTSC is at 59.94Hz.
ircombine doesn't seem to have any place to change this frame
rate.
This is evidently the reason why I have this discontinuity in
the video output.
Can anyone answer the following questions?
* What is the reason for this 0.06Hz discrepancy?
* Am I correct in assuming that this is the reason
for the occasional creeping discontinuity in my
NTSC recordings.
* What can I do about it?
Thanks in advance.
Steve Baker 817-619-1361 (Vox-Lab)
Hughes Training Inc. 817-619-8776 (Vox-Office/Vox-Mail)
2200 Arlington Downs Road 817-619-4028 (Fax)
Arlington, Texas. TX 76005-6171 Steve++at++MrEd.bgm.link.com (eMail)
http://www.hti.com (external) http://MrEd.bgm.link.com/staff/steve (intranet)
http://web2.airmail.net/sjbaker1 (external)
"You can't destroy the Earth - that's where I keep all my stuff!" - The Tick.
=======================================================================
List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
Submissions: info-performer++at++sgi.com
Admin. requests: info-performer-request++at++sgi.com
This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:54:29 PDT