The following audio/video files can be played directly from your OneDrive in most browser: 3G2, 3GP, ASF, BMP, M2TS, M4V, MOV, MP3, MP4, MP4V, MTS, TS, WMV.
If you have videos in a different format, you can still upload them to OneDrive, but they might not play directly in a browser. To view them on a mobile device, you will need to download them first.
If a file does not play, the format might be one that either OneDrive on your mobile device does not support.