This guide states how to make DXV videos for Resolume in detail. You could have a look and hope it would be userful more or less: https://www.instructables.com/id/How-to ... -Resolume/
Speaking of normal video conversion, I used handbrake and winx video converter. personally, I like the winx tool more as it can convert video to MKV, MP4, MOV
, HEVC and other formats without losing quality as well as reduce video size, cut, merge video and more.