CapableMetal said:

Muxing is the process of combining the audio and video files into a single container format (in this case an MKV). Demuxing is the opposite of that. TBH, if you demux an AVC file from an MKV and try to open it in Premiere you may still have trouble. Premiere imports M2TS files no problem, so you may want to try re-muxing from the MKV to an M2TS file using Tsmuxer or a similar application.

Be aware though that Premiere isn't very quick when working with compressed files and I've had problems with it decoding frames correctly before from AVC video streams. I export from MKV to a Lagarith lossless AVI before trying to manipulate the video. The files are very large, but then Premiere itself creates a huge cache of decoded video anyway if working with AVC!

I am trying to work with a remuxed m2ts file in Premiere. But the audio is DTS. As I expected, this doesn't load into Premiere (though the video track seems fine). I would really like edit points to occur simultaneously in Premiere or After Effects (or whatever other program I end up using). Surely there is a way to accomplish this?

Thanks