Hector Martin

(Right click and open those images at original resolution to get the proper idea; Twitter always scales by default)

So I would call this a fairly capable 720p capture card overall, and only slightly lower performance at that resolution than devices that cost 10 times as much. At 1080p things are a bit messier, but it does work.

Any idea why they seem to actively have applied filtering that makes the quality significantly worse? I could understand if it was an analogue capture since the filtering is harder to get right but this is HDMI...

Maybe it can't actually encode 2 megapixels worth of JPEG, and they cheat by halving the resolution and just padding the coefficients with zeroes on the right side?

I totally overlooked the need to do the MJPEG compression. Still, it does seem to have some sort of capture ASIC and I feel like MJPEG would be an obvious built-in feature, and 2M is not... a large image. That probably wouldn't explain the weird sharpening for 720p though.

The MJPEG is definitely done in hardware, but that IP block might be underpowered. Or maybe it's a bitrate thing. Or a limitation of the pixel interface or some other layer.

Are the captured frames the same or similar for p30 and p60 input ? An intermediate 960x1080p60 with half the pixel clock could explain the artifacts, but then I don't know how it could transform into 1080p30 without any DRAM.