when doing complex ASS subtitles encoding, the CPU idle rate is high and the encoding speed is low.

DetectiveLemon

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When there is a lot of dense subtitle content, such as ASS subtitles converted from live bullet screen, the CPU usage rate is only 20%, and the encoding speed is very slow, probably only at a speed of 1x. However, when there are no subtitles or the subtitles are not dense, the speed can reach 5x and the CPU is fully loaded at 100%.

Using h264 or AMF has the same problem, and enable the OpenCL still the same.

ShanaEncoder version: 5.3.1.1

OS: windows 10 professional 22H2

CPU: AMD Ryzen 5800X

GPU: AMD 5700XT

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Comments '2'

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키라라사용자~복복이..........비아동에.거주중! 2023.05.07 16:35

There is discussion bulletin for non-korean speakers.
https://shana.pe.kr/shanaencoder_board_intl

Hardburn with ASS_sub needs more process in general.
Occasionally some instruction causes idle time that makes low CPU usage

I had similar problem few years ago in Handbrake. My CPU was Intel though...

Have you tried same encoding on ffmpeg?? You should test it for better answer :)

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DetectiveLemon 2023.05.07 16:47

Sorry for posting this in the wrong place. Thank you very much for your suggestion. I gonna test it again with FFmpeg later.

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