ContestPad and other Launchpad6 video solutions accept pretty much all video formats.
These include:
.mov,
.mp4,
.m4v,
.m2v,
.avi,
.mpg,
.flv,
.wmv,
.mkv,
.webm,
.ogv,
.mxf,
.asf,
.vob,
.mts
When videos are uploaded they are encoded to support multiple bitrates so that streamed viewing is optimised based on size of device being used and available bandwidth.