Is there a program to convert m2v to mpg/mpeg format?

Probably the best thing to do is to demux or remux the file to seperate out the parts the MKV combines. In your position, I would take the modified version of VirtualDub (http://sourceforge.net/projects/virtualdubmod/) and open the video in that. From there you can disable any audio streams you don't want, making sure to keep the one you do. If you have subtitles or anything like that to worry about, skip to the next paragraph. Set the video stream to direct stream copy and then save to a seperate .AVI file which would then be perfect for putting in your favorite MPEG encoder (I personally recommend TMPGEnc.)

I can't remember if MKV supported subtitle streams or not, but, if it does and/or if this video has subtitles you want to keep in the MPEG, you will need to demux the text stream from the streams list, then disable it (unless the subtitles were already seperate) and add a video filter to apply subtitles -- the exact configuration for this depends on which of the many filters you pick. Finally, you will want to either frameserver (a pain to set up, but uses practically no disk space) or use a lossless codec to recompress to a new AVI such as Huffyuv (which uses a LOT of disk space.) You do NOT want to reencode to DivX or something lossy like that as when you go to MPEG it will hurt things even more and you'd end up with TERRIBLE artifacts.

For more detailed instructions about these things, look up a few tutorials on places like http://www.vcdhelp.com/ and http://www.doom9.net.
 
M2v is an mpeg2 video stream not a matroska file. Should be able to play it in any software dvd player as it is. I don't recall if m2v streams have all of the proper file headers so you should be able to use tmpgenc's mpeg tools to mux your video stream to mpg if you have any problems.
 
Oops, I've been working with Matroska so much recently and haven't really ever worked with m2v. Yeah, I think it means mpeg2 video.

Sorry about that. In that case, if you needed to reencode (such as making it Video CD or whatever,) you could just open it right in TMPGEnc probably.
 
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