I have an .m2ts for the porcupine tree bluray concert that has been demuxed into a .mkv video and 2 flac audio tracks (2.0 stereo, and 5.1 DTS HD).

I can play the 5.1 flac file fine on its own. However, after re-muxing them together with MKVMerge, the speaker layout gets jumbled. Most noticeably the center speaker is switched with the rear left speaker.

I'm wondering if anyone has ever heard of this problem with MKVMerge, or of someone has a suggestion for different muxing software I could try. It seems like everywhere I look it's MKVMerge or bust.

I've performed the same conversion step-for-step with another bluray that has a DTS HD track, and run into the same problem.

Any help would be appreciated.

Thanks.