[benhoff]

The HDMI receive device on the OrangePi5 plus is in a semi-functional state. Collabora is in the process of up-streaming code so the RK3588 will work with the mainline linux kernel.

Until that happens, working driver code is in a very transitive space.

To get going, and sidestep that problem, I've purchased an HDMI to USB capture cards that use MacroSilicon chips. I've some thought of using a cheaper CPU in the future with a daughter board based on this project which uses MacoSilicon chips: https://github.com/YuzukiHD/YuzukiLOHCC-PRO, which made it potentially not a waste of time to dig into.

The MacroSilicon HDMI to USB capture cards output MJEPG, which Rockchip's MPP library has decoder for.

So the thought is: (1) allocate a DMA buffer (2) set that DMA buffer as the MJEPG decoder target (3) get the decoded data to display (sounds like I may need to encode again?) & a parallel processing pipeline

I'll dig into the stuff you've sent over, very helpful thanks for the pointers!

I've thought about switching to Pi4/5 for this. Based on your experience, would you recommend that platform?

[dividuum]

> I've thought about switching to Pi4/5 for this. Based on your experience, would you recommend that platform?

Their kernel fork is well maintained and if there is a reproducible problem it usually gets fixed quite quickly. Overall pretty happy. KMS/DRM was a bit wonky as there was a transition phase where they used a hacky mix between KMS and the old proprietary broadcom APIs (FakeKMS). But those days are over and so far KMS/DRM works pretty well for what I'm using it.