[jitter] Re: AJA digital video output

A few issues here.

1) the AJA cards do not have accelerated graphics. For anything BUT regular CPU (jit.matrix) based image processing this is going to be SLOW, even for window drawing and display updates.

2) THE SDI signal output is uncompressed 4:2:2 YUV standard def, so, unless you are driving your display via analog SD like composite or S-VIDEO, vga or SVI will, technically, be higher quality uncompressed 4:4:4 RGB signals. You *may* be loosing quality, and you will most likely be loosing resolution by doing with SD-SDI. If you want to use HD-SDI, this will be even slower, as your CPu will have more work to do to make up for the lack of a OpenGL accelerated graphics context, and the quality caveats mentioned above apply to HD-SDI as well. Id imagine the only benefit of doing this is to have a genlocked video output.

3) If you REALLY want to do use SDI out, you need to make sure in the AJA control panel that you have 'Monitor/Desktop' enabled in the control section. If you are using the latest 5.1ND drivers this is disabled, and you have to download 5.1 vanilla, but the ND (no desktop) drivers fixes some issues that people were reporting by disabled desktop video out.

Once you have that enabled, you should be good to go, as it treats the AJAs output like another monitor. 

Also, it sounds like you want to use the AJA for both INPUT and OUTPUT at the same time. I do not think that is possible, as the card switches state, although, frankly, Ive never tried having both active at once, as I don't use the video output of the cards

Good luck.


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