Here are the 10 best free Batch Video Converter software for Windows 11/10 to batch convert video files & support multiple file formats. MP2, MP3, OGG, 3GP. 3G2, AVI, FLV, MKV, MP4, MOV, etc 1. Text Guide of Windows Media Player. Follow the below steps to convert mp4 to mp3 Windows media player: Step 01 To begin, open the MP4 file with Windows Media Player. The program will play it by default. Step 02 Now, hit Menu at the top-right corner to go to the Home screen. Then, select Organize > Options. 1gh5ICc.