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I recently installed Processing (both 2.2.1 and 3) on a MINIX Z83-4 running Lubuntu 16.10 only to learn that gstreamer/ffmpeg is not properly supported. The repository ppa:mc3man/gstffmpeg-keep does not work with 16.10, so I reinstalled with 16.04.2LTS and added the necessary plug-ins. Currently I am getting the "Could not load the movie file ...." on the examples included with the video library. Images and sound files seem to be loading fine. It looks like I have the good, bad, and ugly plug-ins installed.
I have not encountered this issue on my other platforms (Mint 18.1, RHEL 6.5, Mac OSX, or Windows).
If anyone has any experience with this, insight would be appreciated.