Thanks for the reply. I have looked at those devices. What I don't want to do is unload a dozen 80 slide carousels. I have a Elmo TRV 35H video slide changer. It out puts S-video, RGB composite and what looks like SDI (BNC connector). I am looking for a video capture device/software that my Mac Mini will recognize and send these images to iMovie, Photos or some other editing software. The slide changer does, in fact, out put images. It will play into a display.
The only software that can do this and is now quite expensive is Topaz Video Enhance AI and also you need an intel Mac with an external GPU card to run it. I used it with my Windows 10 PC with an Nvidia GPU card during the 2020 lockdown to convert all my S-Video, VHS and MiniDV capture videos to 1080p and 4K stills.
This is their version of Gigapixel AI for video and extracting video and turning them in still images in 8MP in 4K and 33MP in 8K with AMAZING RESULTS.
So what you do is capture the S-video of your slides. Then you feed the captured video into Topaz Video Enhance AI and it's Artificial Intelligence will convert your S-VIDEO footage into a series of highly detailed still images, if you choose the still image option, into a series of 8MP stills if you choose 4K or up to 33MP if you choose 8K. But be forewarned that you need to have a really beefy card such as the RTX 2060 as minimum or the RTX 3080 or GTX 1080Ti cards. The equivalent of those Nvidia for macs is minimum AMD Radeon RX-580 and the Radeon 6800XT or 5700. They are not cheap.
In fact, that's what I did during 2020 during the lockdown and that was to convert my VHS, S-Video and MiniDV footages all into 1080p and highly detailed stills so I can create movies through Davinci Resolve as well as using my other Topaz AI still software to enhance the stills that came out of VEAI or using DXO Photo Lab to further enhance my final stills.
The stuff you captured through Elgato or Diamond S-VIDEO source is of very very low quality. It's not worth even using these low rez footage in iMovie if your final product is a 1080p or 4K display. You need to upscale them and Video Enhance AI is the only software that not only can upscale them properly, but add in fake detail that wasn't there and look very and extremely convincing.
Now though, the software is $300 and the hardware needed to do that is also very pricy. If you have the required beefy hardware by renting a gaming PC, then you can download their free trial which I think is good for 30 days. And during the 30 days, convert your video to stills for free without paying the $300 fee and only pay the rental fee for the gaming PC if you have a place in your town that does that.