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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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    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 :)

    g39.gif

  • ?
    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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