See About using video for recommendations on video formats. Basically, you should only use either MP4 video files or online video sharing services (YouTube, Vimeo and Prezi). All other video formats will cause problems sooner or later.
Check that the correct codec and/or player are installed. Videos can only be played if the correct player and codec support for them is installed on the computer where your help is being viewed. Generally speaking, only MP4 video is reliable.
With some formats and/or browsers you may need to activate the Start Automatically and Show Controls options in the Insert Video dialog for the animation or video to play correctly. Flash videos do not support these external controls – if you want player controls for Flash you must embed them in the video with the program that you use to create it.
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