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ENH: When using FFMPEG encoder, it first check if you are using a recent version of FFMPEG (or an old one as it was required previously for vtk). Then vtkFFMPEGWriter uses either the older API or the new one. See http://www.vtk.org/pipermail/vtk-developers/2009-December/006522.html. Original solution provided by Berk Geveci and improved by Nicolas Rannou.

BUG: FFMPEG linking fixes. Give ParaView access to VTK's FindFFMPEG. Don't fail if FIND can't find the library, instead give the user a chance to specify where it is. Don't automatically link against the library if it is found, because FFMPEG is likely to be too old to use. Give the user one variable to control whether it should be linked, and only show that if the lib is found.