Which video formats are supported?

FLV, MP4, MOV, M4v.
MOV is a bit tricky if it is not saved as H264 with AAC for audio setting. Then the player will not recognize the Quicktime format. If most of your videos are like that, let us know upfront so that we can do a test (give us a link to a MOV) and adapt the plugin if needed.
For HTML5 compatibility, best use MP4.