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An SWF is a container for Flash projects – not a vide file. The movie inside the SWF is most often an animation, not a plain video file. The Flash video file format is FLV.
Our Encoding Engines accept many different types of video files, including filetype: MPEG, AVI, etc.
You can always visit our Support Center to find out which formats we recommend.
Our read more about video encoding here!