Any program which does .mp4 to .mkv files

[LOLROB]

any paid and free converters?

[Inscribe]

Ever heard of Google?

Edited by Robbie! (Forum Super Moderator): Please do not post unconstructively

[Mentor]

SUPER - its free, and will convert more aless anything to anything, quite speedily to if your pc aint to slow.

http://www.erightsoft.com/SUPER.html

It makes its money but getting you to trawl through a few pages of text and ad's to find the download link, but the software itself is excelent

[The Professor]

Thanks mentor, I usually pirate AVS converter but its always nice to use a good free one

[Jam]

HandBrake.