RIFE scale=0.5 not improving performance

[Chrysanthemum536]

is it just me or does setting scale=0.5 not help or even slightly decreases performance compared to scale=1? If I downscale the video myself before frame generation the performance does increase considerably, although I suppose that's not the same thing. I am running rife 4.4 using tensort.

[WolframRhodium]

Do you have benchmark data?

[Chrysanthemum536]

How should I benchmark? I am just using as a filter for mpv right now and seeing what speed I can go to before dropping frames.

[WolframRhodium]

Fine, then I'll do the benchmark myself. What's the video resolution and hardware configuration?

[Chrysanthemum536]

I am using nvidia 3090 and tried both 1440p and 2160p 24fps upscale to 48fps

[WolframRhodium]

A 3090 may not capable to do that. My benchmark with vsmlrt v15.2 on a 3090 using a 2880x1472 input:

config	fps
_implementation=1, scale=0.5	44.18
_implementation=1, scale=1	41.18
_implementation=2, scale=1	58.84

(_implementation=2 only supports scale=1, and will use _implementation=1 as a fallback for other scale values.)

According to the data, scaling barely improves performance, but the v2 implementation is much faster here. This benchmark is done in native VapourSynth on a server xeon processor (Xeon Gold 6226R). The mpv playback also come with overheads.

[Chrysanthemum536]

ok, thanks for confirming.

i did not have _implementation set, so probably it was using implementation 2 without scaling and implementation 1 with.