SamyGO

As stated in the topic, I have problem after downloading mkv and mp4 files, tv's player wont read mkv and mp4 files
Csn this be solved somehow?
I tried some converting softwere to convert these files to fit samsung tvs but it doesnt work, the softwere converts files for samsung tv in a minut or 2 but it wont read them again, only if I convert mkv and mp4 files into avi format then it can read them, but it takes ages to convert to avi, at least 2 hours for one file...

uhm... those are all container formats and not encoding type. if you put a cat in a bird cage its still a cat

Maybe I didnt use the proper terminology but you still get the problem
Solution?