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I have an opera that I'm ripping to my computer in MKV format with Handbrake. This opera is on two discs. Is there a way to join the resulting MKV's together? They will have the same bitrate, resolution, etc. If I do this, can I keep chapters from both MKV files organized? And, since I have subtitles in the file (not burnt in), will they still stay intact?

I'm not too sure if this question is off-topic or not. If it is, feel more than free to delete it. :)

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If the resolution of the videos are same, then you can use avidemux to join them

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  • This method was easier than aking1012's, so that's the only reason that I accepted this answer. – Ryan McClure Mar 24 '12 at 23:05
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Recommended way is to use mkvtoolnix

sudo apt-get install mkvtoolnix mkvtoolnix-gui
  • Start mmg (graphical user interface for mkvmerge)
  • "Add" the first file
  • "Append" the second one, third, fourth, ...
  • Set output name in the textbox at the bottom
  • "Start muxing"

Subtitles are preserved and properly concatenated, so are audio and video. Chapters can be edited in the resulting file with mmg.

This procedure creates a properly muxed file. Any problems should be mentioned in the "log"-window in mmg. You can even set and name audio and subtitle tracks with the correct language codes and Annotations like "Forced" or "Directors Commentary".

If you plan to do this repeatedly on different files you better use the command line version mkvmerge ("mkvmerge --help")

mkvmerge -o output.mkv input1.mkv +input2.mkv
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    I don't find the append button in mkvtoolnix-gui currently. The command line version seems to be the simpler and faster way to concat mkv files. Note the + character to append video files instead of merge. – Jaime M. Jan 21 '18 at 23:10
  • I just used mkvmerge (without the plus sign) with no issues to combine an mkv video file and an mp3 audio file that had to be downloaded separately from a website. It rocks! – Joe May 26 '18 at 7:06
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Use this command in terminal, to merge two separate '.mkv-files' into one.

mkvmerge -o newfile.mkv part1.mkv +part2.mkv
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  • This worked perfect for me. – John Manko Apr 28 '18 at 8:39
  • The higher rated answer actually tells you how to get mkvmerge... – Auspex Apr 26 '20 at 18:11
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The easiest way to combine video is to use a container format that supports concatenation and re-indexing, like mpg. Then you can just cat file1 file2 > file3 and re-index with ffmpeg.

The steps in your case would be:
Convert from mkv to mpg
Concatenate
Re-index
Change back to mkv if you like

If it's just audio, you could use a more easily editable file type...like wav, mp3, or ogg until you've got your final output. Then you can use loads of tools to join audio. Sox or FFmpeg come to mind.

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  • I'm in the process of ripping disc 2 now...whenever I finish, I'll give this a try...let's hope it works! :) – Ryan McClure Mar 24 '12 at 9:47
  • Nice that only ffmpeg is required for this solution! – user93692 Nov 2 '16 at 12:31
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You can use dmMediaConverter to do this. It is very simple and works well. There is a mode of the program for joining MKV files and uses ffmpeg under the hood. See this answer for more.

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