That's why the granular settings for the excellent x264 & x265 encoders are important - a few converters use presets with speed a top priority, to the extent that quality is sacrificed. Unless there's a bug in whatever app, these ffmpeg-based converters should all give you pretty much the same quality when using the same encoder settings. In a short test encode to AVC it utilized all 16 cores of the CPU at near 100%, which is good, though clock speeds never reached the max. It seems to have rudimentary Nvidia CUDA support, but nothing I could see regarding Intel Quick Sync or AMD. It does allow granular settings for the x264 & x265 encoders included in ffmpeg, the default being SuperFast - slower settings equal more quality. IDealshare VideoGo is more-or-less you standard ffmpeg-based video converter.
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