What types of video files can I add to a VoiceThread presentation?

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We recommend that you create videos in .mp4 format if you’ll be uploading them to VoiceThread. Other formats may work, but there’s no guarantee. 

There are a number of “container” formats like QuickTime, WMV, and AVI that are like an envelope containing the video. A QuickTime movie, for example, can be encoded by close to 40 different codecs. VoiceThread can convert the vast majority of them, but not all. 

Also, you can embed a YouTube video into your VoiceThread presentation via its link. VoiceThread’s Importing Media From Another Website page explains how.