davidfrost wrote:It plays MKV in all kinds of compression right? Since I'll pe working pretty heavily on MKV files.
I'm not sure that I fully understand your question -
Although the slideshow software will save your finished slideshow project as a mkv file; it is meant to handle images and their associated transitions. (Images, not video). I don't think that the program actually 'plays' mkv - it saves your project in the mkv format to make it accessible in other software.
You can save a slideshow as an AVI, MKV, FLV, MP4 or WMV video file.
For creating custom movies from video mkv's, you need a different software like Bolide Movie Creator, which can easily edit files of all supported video formats (AVI, MPEG, AVI, VOB, MP4, DVD, WMV, 3GP, MOV, MKV).