[DCP-o-matic] recursion

Right now it is not good for much, but still interesting - ffmpeg added J2k MXF support a while ago, and since dcp-o-matic uses ffmpegfor input, it is actually possible to feed a DCP-o-matic generated J2k-MXF (or from any other unencrypted DCP) into DCP-o-matic as source content. Right now, the only option then is to recompress it into another MXF, which is hardly exciting. But - wouldn't this be a starting point for 'unwrapping' and transcoding of existing DCPs to other formats, again by using FFMPEG, this time for ouput? - Carsten