Thanks, now got some time.
Fortunately my devices play mkv natively, a WD HD live and a PI running XBMC, thus was really trying to get Cover Art info to show, after getting the mkv to list.
Going to look into Virtual Box and then the dev env, to see if I can get the data into mediatomb database that LNMCE has.
In querying the database, I realize the data is stored as a blob, trying to find the structure of that blob, whether XML etc, maybe I can just enter the data myself from LNMCE listing.
On a side not, not sure if it worked, a query showed data in the metadata field, only for the mkv though, so maybe I getting some luck
| dc%3Atitle=xmen |
| NULL |
| NULL |
| NULL |
| NULL |
| NULL |
| dc%3Atitle=Disney%27sRedo%20A%20Christmas%20Carol%202010%201080p |
| NULL |
| NULL |
| dc%3Atitle=matrix |