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Using mkvtoolnix, there should be no decompression/recompression though. In the end, I managed to follow the mkvtoolnix procedure using original index.bdmv files and ended up with one mkv file exactly as described. And since I used bdmv files, no decompression/recompression was used for sure. Just ...

I followed described procedure (using original index.bdmv files) and it worked perfectly. Thanks a lot for sharing!

Thanks a lot for detailed procedure. I will definitely try.

Just one more question - if I merge two mkv files, I will end up with lower quality of resulting mkv file, right? (because of decompression and repeated compression).

Thanks for prompt and clear reply. In such case, this might be feature to be considered for the next makemkv update? As for mkvtoolnix - if there is a "tricky" part, I better keep two mkv files. Looking for easy to use, intuitive solution to achieve the goal. I guess this feature must have...

Is it possible to open simultaneously two index.bdmv files (film is divided between two discs), choose the respective tracks, and combine them into one mkv output file?