Since the 8000 generation, Intel CPUs can use qsv to encode videos faster. FFmpeg since version 5 (maybe earlier?) also supports qsv and there is sample code for it as well.
Would that be feasible in kinovea? It would greatly speed up the encoding.

My other suggestion is to provide a few encoding options:
- Choice between Quality (0-100%), cbr and vbr (with bitrate)
- checkbox "weboptimized": to set +faststart and zerolatency flags (because we want to publish the video on the internet)

What are you thinking?

Best regards, Christian