[fandangos]

We are using a implementation that we had to cherry pick by the plex team on ffmpeg.
FFmpeg does not support dv mkv yet.

That will be a major thing. Is there any coonection from the Kodi team to FFmpeg team? How can we push the mkv dv support in FFmepg?

We don't. 
This has been addressed in this thread. The way the code exists now it's not something ffmpeg team wants to use, or something along those lines.