I would suggest using .kkapture: http://farbrausch.de/~fg/kkapture/

Interesting - I haven't tried .kkapture because I thought that it only works for demos that are using the API as of when the tool was created - which means a lot of the newer demos won't work with it. But maybe I'm wrong? I'll poke around.

I tried Capturinha (https://github.com/kebby/Capturinha), but couldn't make it work for lossless - it might be an easy code change though.

I also tried OBS and almost succeeded. The only remaining problem with OBS is the colour space conversion which is not lossless. More precisely, trying NV12 gives me wrong colours and trying anything else gives me "Encoding Overloaded" for no apparent reason (all performance indicators, CPU and GPU look mild).

>> My only theory is that GPU memory might be getting full

  I checked, it wasn't.

>> Maybe I should use hevc_nvenc with lossless setting

  Tried, ran into the same problem as with hwdownload->utvideo. Maybe something 
about the grabber?
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