Cine Encoder is an application that allow to convert media files while preserving HDR metadata.
Videomass
It is a FLOSS, powerful, multitasking and cross-platform graphical user interface (GUI) for FFmpeg and yt-dlp.
MystiQ
Easy to use and elegant Multimedia converter.
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HandBrake is an open-source video transcoder.
Ciano
The ciano is a multimedia converter for all the format you need.