Default How can I play unsupporte video files on Nexus 5

From Nexus specs, we know Nexus 5 video format is limited to H.264, H.263, MPEG-4, VP8. If I want to transfer other videos to it, I need to change the format first. I goggled and find the way adding video files (MKV, AVI, VOB, Tivo, MPG, WMV, FLV) to Nexus 5 from computer for smooth playback with Pavtube Video Converter, very useful.