How to convert AVI or multi media files to MP4 using VLC Media Player
How to convert AVI or other media files to MP4 or to other media files
(MPEG-TS,MPEG-PS,MPEG 1, ASF/WMV, Webm, MJPEG, MKV, FLAC, Ogg/Ogm, WAV, RAW, MP3, MP4/MOV, FLV, AVI)
VLC link download: https://www.videolan.org/vlc/index.html