Download videos and music from YouTube or other 1000 plus sitesįree Download Steps to batch convert FLV to MP4 on Mac (without losing quality):.Extract video or audio from encrypted DVD.Convert any high-quality media files from one format to another.trim/crop FLV apply subtitles/effects to FLV, etc. Merge FLV videos and convert large FLV to MP4, MP3, MOV, AVI, etc.Convert over 2, 5, or 10 FLV files in bulk.