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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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31 English When to add GPU 2PSS qsv 2pass 1 kedyao 2023.03.13 5412 0
» English when doing complex ASS subtitles encoding, the CPU idle rate is high and the encoding speed is low. 2 DetectiveLemon 2023.05.07 2757 0
29 English Would like to add task list export and import functionality. cjjdaq 2023.07.22 5214 0
28 English ICQ and CRF kokoro 2023.08.14 4533 0
27 English In the new version, when shanasubtitle is turned on, there are two video streams in the encoded video file. 5 cjjdaq 2023.08.25 3249 0
26 English coverting mp4 contain hev1, hvc1 issue? CBCBC 2023.09.14 2981 0
25 Simplified Chinese 新版本转换编码hev1和hvc1 的mp4视频 问题 1 CBCBC 2023.09.14 15614 1
24 English The subtitle list and audio list are missing more information. file cjjdaq 2023.09.15 4390 0
23 Simplified Chinese 设置了intel硬件解码器QSV没有效果,并没有进行硬件解码 file rtere 2023.09.27 15188 0
22 English Black background 1 file tgif 2023.10.06 5210 0
21 English subtitle when activeted ti 2023.10.25 5033 0
20 Simplified Chinese 在进行转码时,cpu频率固定在一个值 yangxuheng 2023.11.15 15880 0
19 Simplified Chinese 希望在视频编解码器 复制 里也能压制字幕 8 yangxuheng 2023.11.16 16176 0
18 English I hope that subtitles can also be suppressed in the video codec copy yangxuheng 2023.11.16 4035 0
17 Simplified Chinese 希望增加更完善的暂停功能 三水稻田 2023.11.23 13966 0
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