My Samsung UE46D5700 is not supported by MiniDLNA (lots of unsupported files, esp. MKVs)
The reason is the user agent. It says "DLNADOC/1.50 SEC_HHP_[TV]UE46D5700/1.0".
Patch against 1.0.21 (as provided by Ubuntu & Debian) skipping the DLNADOC/x.y part before doing the vendor detection.
With it, most (*) MKVs play just fine.
(*) some have a choppy sound, and embedded subs are not detected