How to convert FLVs to MP4 fast without re-encoding

Nice, I created a guide to batch convert multiple files inside a folder in Windows
the link is here: https://obsproject.com/forum/resources/guide-batch-convert-flv-to-mp4-losslessly-with-ffmpeg.525/

Tells you everything you need, and is a big help for people trying to keep their quality w/o risking losing their recording using formats like MP4. One thing that could be added, which is a good program to use (if you're on Windows), is Avanti GUI for FFMPEG.