Custom Resolution Utility (CRU)

[TechnicalMonkey]

Hello,

I am new to this forum, and want to open up by saying,"Thank you for a great piece of software like CRU." I hope that one day I can provide something as useful to this forum one day, but alas I am a beginner at how to make custom resolutions work--particularly with EDIDs. So it brings me to my question that I would hope others would like to hear about.

I own a few capture cards as I practice live streaming more for learning the technical aspects of it. The capture cards that I am experimenting with right now are the Datapath VisionAV line of cards. I have a VisionAV/B, a VisionAV-SDI, and a VisionAV-HD. I went with Datapath cards as I have been a long time owner of an E1 and E2 card, as well as a user of the E2S, and I know how well they are at accepting any resolution that you can throw at it for the most part. I've had much success in working analog capture, as well as DVI-SL to their maximum potential. However, the card itself is supposed to be able to receive HDMI 1.3 signals (if I said that correctly,) but this line of cards has a limitation that I can accept for what it is. The receiver chip that Datapath uses in this line of capture cards is the ADV7604, which receives 3 types of signals. The first is analog capture with a limit of 170 Mega Sample per Second (170MSps) that makes for really nice sharp RGB capture. The Second is DVI-SL in which can sample at 165MHz, which I was able to push 2560x1440@42Hz with reduced blanking timings. The last and one that has me stumped the most, is HDMI 1.3 which is supposed to allow custom resolutions, but the chip itself can only sample at 225MHz.

The thing that I am trying to do is capture, as an HDMI signal an output from a modern nVidia card, 2560x1440@50fps. I know I should be able to do this as it would only take about 201MHz to accomplish this, or that is what I belive is supposed to happen. However, when I try to do this, the image will not capture.

I ran Datapath's application called RGBHelper that comes with the downloaded driver and application package from their site, and it shows that the signal shows as DVI-SL. I tried patching the card to remove it's limitations, and tried to write in a custom block that would hopefully show the video card as HDMI instead of DVI-SL. In the end it will not show up as anything other than DVI-SL.

Has anyone here have any experience with this matter?

Thanks for reading this post, and for any responses in this matter.

Sincerely,

TechnicalMonkey

EDIT: I just wanted to update you guys on what I found. According to Datapath, the DVI/HDMI dongle that they pack with their VisionAV cards are proprietary, and the seemingly DVI-I looking ports can work as standard DVI-SL, but are also wired for HDMI on the pins normally not used in a DVI-SL configuration. I plan on ordering some of these dongles and will post an update on this section.

Lesson to be learned here: DON'T lose your capture card accessories.