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

Prev Would like to add task list export and import functionality. Would like to add task list export and import functionality. 2023.07.22by cjjdaq When to add GPU 2PSS qsv 2pass Next When to add GPU 2PSS qsv 2pass 2023.03.13by kedyao

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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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