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Written by matt sephton on 2025-01-17 at 16:13

Any recommendations for a lag-free USB-C video capture dongle? It's a minefield on Amazon, eBay, AliExpress.

Looking to feed HDMI into my iPad and MacBook.

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Written by Alex on 2025-01-17 at 16:42

@gingerbeardman What is the maximum permissible latency? There will always be some preview delay with most solutions.

Target capture resolution/budget?

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Written by matt sephton on 2025-01-17 at 16:49

@compucat ideally 1 frame, I just want live video from Dreamcast (VGA to HDMI adapter so I guess 480p, or 1080p) in a window. Budget decent!

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Written by Alex on 2025-01-18 at 20:12

@gingerbeardman One frame (16 ms at 60 Hz) is going to be very difficult; different viewing applications add various amounts of presentation delay.

Common/inexpensive dongle chipsets like the MS2130 will only get you down to ~50ms, depending on viewer.

The closest solution I'm aware of is a Magewell Pro Capture PCIe card and a viewer using MW's low-latency API. Using their example app, I can achieve ~17ms latency. Of course, the form factor is a bit cumbersome. :)

Magewell's docs aren't clear on this, but it's possible that the low-latency API works with their Eco Capture M.2 cards as well. That'd let you use an Eco Capture AIO inside a Thunderbolt <-> M.2 adapter with your MacBook.

EDIT: see reply

Allegedly it is possible to achieve equivalent latency with BMD DeckLink devices, but I haven't seen a turnkey software solution for that.

I haven't seen any equivalent solution for iPad.

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Written by matt sephton on 2025-01-18 at 20:33

@compucat apparently some devices using MS2130 remove the scaler and can get down to 30ms https://youtu.be/Q9Zr5vlmoXo?t=575

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Written by Alex on 2025-01-18 at 20:37

@gingerbeardman Ohoho, very useful. Thank you!

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Written by matt sephton on 2025-01-18 at 20:54

@compucat here's one that seems to show 28ms just by matching the input and output resolutions. Add you can flash firmware! Apparently FW varies in quality https://youtu.be/G9WZ_xkGTTY?t=420

=> View attached media

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Toot

Written by matt sephton on 2025-01-18 at 21:00

@compucat ok final one https://youtu.be/r5e5VhAsWiQ

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