Hi,
I've seen lots of development work related to capturing NTSC/PAL video
and simply displaying it (video4linux, video4linux2 for TV tuner cards,
etc.)
However, I haven't seen much (any ...?) information or projects related
to overlaying graphics on top of captured video.
With a generic x86-PC, I'm envisioning:
a) Capturing color video (720x486, PCI bus->Memory)
b) Transferring each frame in real time to a 3D graphics
accelerator card (Memory->AGP4x->GFX Card)
c) Drawing the video data as a textured rectangle or
using glDrawPixels()
d) Rendering/Blending additional graphics on top of it
with OpenGL.
So here are the questions: :)
1) Is it even possible to do this under Linux/XFree86?
2) Has anyone done such a thing already?
3) Assuming yes, can it be done at full-speed (30Hz)?
(i.e. no dropped frames, constant framerate?
bandwidth limitations?)
4) Any suggestions for graphics cards + capture cards?
(that would play well together and with the available
software?)
Being able to drive an NTSC output would be nice also, as there are
a number of attractive display options that don't have VGA inputs.
Hoping I'm posting to the right list(s) :) If I'm
not, hoping you can point me to the right ones ...
Thanks!
Brian
-----
Brian Hoffman
Intuitive Surgical, Inc.
brian_hoffman@xxxxxxxxxxxx
