As we mentioned just now, AVI files can be encoded with different video and audio codecs, which might not be supported by VLC media player. So it's normal that you can play some AVI videos, but fail to play others, let alone convert those AVI files with it. So you need a powerful video converter to convert such AVI files to supported VLC AVI codecs or formats. WonderFox HD Video Converter Factory Pro is a solid option. It can import almost all video files and convert them to over 500 digital formats, codecs as well as devices, such as convert AVI to MPEG, H.265, H,264, DivX, XviD, etc. The following part shows you how to convert AVI files for easy playback.