A couple of the latest media player are able to play the "very popular" MKV files. What do they use to render or convert to MKV. TMPG has no option yet to do this so one has to download a MKV converter.
I think some of you are confused about MKV... it's not a video or audio standard, it's a wrapper -- like Quicktime (.mov), MPEG-2 (.m2ts, .mts, .mpg), or MPEG-4 (.mp4). It can contain anything you like.
Most folks are probably putting the same stuff in .mkv wrappers that you'd put in MPEG-2 or MPEG-4 wrappers: AVC, AAC, AC3, etc. DivX is using it, rather than AVI, for their more recent DivX standards... it supports more sophisticated file structures with navigation, as you can with the MPEG standards but not with AVI.
Why the interest? Well, some of the kids online are using it simply because it's the latest thing, and they're all so very l33t. In more defensible terms, it's an open spec, and a new one.. so it does most of the things folks have thought about doing in a video stream standard, and the tools are open source and free. If you compare, most of the free tools for manipulating MPEG-4 and even MPEG-2 streams are weak and/or buggy. And usually closed source.
As hazydave sad, MKV (aka Matroska) - it is container for visual and audio data. Matroska is an English word derived from the Russian word "matryoshka", which means nesting doll container.
I know. It's a wrapper which is capable of using menu structures just like a video dvd does. Thus makes it possible to keep dvd menus when converting to MKV. Also it should be possible not only to keep menu structures but also to build new menu structures - what makes MKV a VERY interesting container format nowadays. The pity is the lack of information how to do this.
"Why the interest? Well, some of the kids online are using it simply because it's the latest thing,'
Why the interest? Well, it's a wrapper that will hold the original content without re-encoding, or compressed content. It will retain not only DVD chapters, but the menu structures as well (not a lot of implementation of this yet). Lots of advantages over M4V.
An MKV file, among other things, is like a portable DVD that you can keep on your hard drive, play, and even extract the original footage later and recreate the original with menus and chapters intact (someday), and no quality loss. There is some attraction there.