Final update: It seems there's two different issues here: One with ffmpeg: My error message looks like this: [h264_nvenc @ 0x5557207b3f00] Lossless encoding not supported [h264_nvenc @ 0x5557207b3f00] Provided device doesn't support required NVENC features Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height [aac @ 0x5557207ebf80] Qavg: 15661.693 [aac @ 0x5557207ebf80] 2 frames left in the queue on closing Conversion failed! This hints at this recently fixed bug, which seems to be hardware-specific: https://fftrac-bg.ffmpeg.org/ticket/9165 So far so good, let's hope it's really fixed in some future version. The other problem is definitely with OBS-Studio. While the old 26.0.2-3.2 from packman works fine, every newer version I could try (either from OBS – the open build service – or from packman) gives terrible encoding lags when using the NVenc encoder. I guess for this problem I have to file a bug at OBS Studio directly... Joe