I got the same card in one of my capture PCs. What application do you use for capture? The LD-HD2 does not have a frame buffer, so it can't flip the image in the driver as the E1S can. As a result captures in Amarec and other apps are flipped upside down.
I used the RGB-DVI 300 for my DC for quite a few years. Aside from the fact that you have handle audio "seperately" it's still a great box. You don't really have to route the signal through the FM just to get audio muxed into the signal. In your capture app (whatever it is) you should be able to grab video from teh Datapath and audio from a seperate analogue input on your PC.
I just bring the HD2 into OBS, it pops up there with no problem.
Regarding audio, yeah, for my retro PC setups I already route the audio into my workstation's sound card input, so I am set there.
Just wanted to post an update. I finally bit the bullet and got myself one of the RGB-300 Extron boxes (specifically the HDMI version). No issues running it into my capture card and it just worked the second it received a signal. I also happened upon one of the "A" versions as well that allows you to run audio into it and pass it through the HDMI cable, so I no longer need to run a cable from my retro computers to the line-in on my recording PC's sound card. I specifically tested it with my old Windows '95 rig for about four hours with a variety of Windows and MS-DOS games (Blood, Sega Rally, Doom, Stonekeep, Wolfenstein 3D, Hexen II, Quake, etc). Rock solid from start to finish. I wish I knew about these things sooner!
Sounds like a solution has already been found, but I was curious if GBS Control could be an option here. Fed GBS Control a 72khz test signal from a VP30. Confirmed it will negotiate the signal. Spoiler
There was a period where Extron machines used 4:2:2 chroma subsampling. Almost everyone did. I don't remember if the RGB-HDMI-300A is 4:4:4. The DSC-301HD is known to use 4:4:4 full chroma. The RGB-HDMI-300A may or may not.
Also, the DSC-301HD has frame lock and the RGB-HDMI-300A does not. Frame lock should help prevent frame rate conversion artifacts.
It could also be that the DSC-301HD does a better job getting the signal dialed in while sampling.
Correct me if I'm wrong. Do I have to upload images somewhere in order to post the links here? I can't find a way to just upload images here. Am I missing something?
Edited:
A few minutes later... As per the FAQs, looks like I don't have enough permissions to post images for the time being.
I'll upload them to Dropbox or something. I'll be back.