ffmpeg action 
ffmpeg action is an automator action that uses the open source ffmpeg tool to convert movies to other formats on mac os x. ffmpeg will recognize most formats, including quicktime, avi, mpeg, wmv, and more.

Currently the following conversions are supported:

convert to wmv
convert to mpeg4
convert to avi
convert to 3gp

more formats will be supported in the future.

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