If you are unable to open an MP4 file on our media player, try changing the video format. There are many good video converters available on the internet that can help you convert your MP4 to MP3, AVI, ...

I need a command line program to concatenate wav and or mp3 files. I have one wav file, and one mp3 file. In the end I want to have one mp3, so I will have to do some converting first before I can ...