Anime4KCPP GUI with ACNet bottleneck

[bugale]

Hi,
I am using Anime4KCPP GUI with the following settings:
ACNet, HDN=1, upscale ratio=2, threads count=24, codec=mp4v, GPU acceleration with CUDA.

My PC has RTX 3080 TI and i9-12900k, both overclocked, running Windows 11.

It seems like the process only uses ~30% of the CPU and ~30% of GPU (at least in task manager), and it takes about 15 minutes to convert a 24-minute 1080p file to 4K.

Is this an expected behavior? What is the bottleneck here?

[TianZerL]

Bottleneck is because of codec, we need to wait the encoding to make sure your memory will not be full, and color space conversion (RGB -> YUV -> RGB).
Use VapourSynth with multi-threaded codec and NV12 input instead of GUI or CLI to get the best performance.
You got only 38 FPS, I forget about 1080p to 4K but I got 600-800 FPS in 480p to 960p in VapourSynth with RX5700XT and AMD Ryzen 3600X, all no overclocked. And same 480p video in GUI, i got about 200 FPS.