[mythtv-users] WOT: Moving video around in a PC without using overlay

[Robert Longbottom]

On 3 Mar 2011, at 04:31 AM, Jay Ashworth <jra at baylink.com> wrote:

> ----- Original Message -----
>> From: "Raymond Wagner" <raymond at wagnerrp.com>
> 
>> If that's the case, you would be best off using OpenGL. Still
>> technically in software, but you're using shader language and your
>> graphics card to do the conversion and scaling, something it is
>> explicitly designed to be good at.
> 
> We (I) may have fallen off the cart here:
> 
> I'm planning to take between 8 and 16 640x480-grabbed NTSC signals,
> and scale *all of them* down to smaller pixel counts, and then position 
> them in various places on one (or 2) 1920x1080 HD-VGA outputs (which will
> then go HDMI to a monitor).  It sounds like you're suggesting that I can
> use OpenGL to hand the full-size grabs to the video card and let *it*
> scale and position into its output buffer; did I read that right?
> 
> Cause that would be handy.  :-)  Would I end up with enough PCI bandwidth
> to pull that off?  And where *should* I have been asking these questions,
> anyway? 
> 
> Cheers,

Just a thought but if you are going to scale down these input streams anyway, why bother to capture them at 640x480??  Just capture them at a lower resolution. Less bandwidth required and easier to scale. Even better if you capture them at the size they are going to be on the screen then no scaling needed at all.

Robert.