seeking advice on "VFR" and nvencc usage

[hydra3333]

per https://forum.videohelp.com/threads/388221-Seeking-advice-on-videos-from-Samsung-S8-no-HDR I have bought a Samsung s8+ phone which seems to record h.264 "variable framerate" videos up to 4k. Attached are results of using mediainfo and ffprobe on various resolutions.
Samsung-Galaxy-S8plus-Video-Codec-Summaries.zip

So, a few newbie questions I hope you do not mind me asking :

1. does nvencc handle "vfr" videos, and what comes out of the end of the process, vfr video or fixed framerate (or whatever it's called) ? Are there ay special commandline options I need to use ?

2. can nvencc convert vfr video to a fixed framerate video (notionally 30 fps which the s8+ camera advertising says it is) ? If so, how would one do that ?

Thanks

[rigaya]

By default, NVEncC assumes input as cfr ("--avsync cfr"), and cannot handle vfr videos properly.

I have added option "--avsync vfr" to enable vfr output in NVEnc 3.31, it will pass timestamp from the source when using avhw/avsw reader.

Also you can test "--avsync forcecfr --fps 30" for cfr conversion, but since it does very simple cropping and duplicating to adjust framerate, it might lead to "lagging" motions.

[hydra3333]

Brilliant !
Thank you very much.