Acceptable video file formats for the Chalk Pushcast Plug-in for Microsoft PowerPoint
You can add .avi, mp4, .mov, and .wmv video files to content that you create using the Chalk™ Pushcast™ Plug-in for Microsoft® PowerPoint®. You should make sure that video files are encoded in a format that the Chalk Pushcast Player supports.
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Settings that you can use to convert video to 3GP format