There is no enabled speed limit by default. What do you mean by *different versions* ?
You can place your ffmpeg binaries in different folder and modify Settings-Advanced Settings-search for ffmpeg/ffprobe and set full path to different binary. eg c:\\ffmpeg\\ffmpeg.exe (the double \ is intended!)
In case there will be another update for ffmpeg binary, only the one in tools/ folder within JDownloader will be updated. Customized ones won't
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JD-Dev & Server-Admin
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