Linux: How To Tell If Your Video Editor Is GPU-Encoding (NVIDIA/kdenlive -but-really-any-editor)
For me, under Kdenlive (23.08.1) , "GPU accelerated" rendering was taking just as long as non-accelerated rendering. I thought maybe Kdenlive wasn't compiled properly, and was falling back to CPU rendering without telling me. But things are complicated. This is how I figured out it was working, just not helping, using ffmpeg and nvtop.