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I have a MKV file in which I want to embed an AC3 audio file. I also want to embed a SRT subtitle file into it. How can I achieve that?

Note: AC3 file is the same length of the original video.

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up vote 7 down vote accepted

If you have MKVToolnix installed, you can use the mkvmerge command to merge together the streams.

mkvmerge -o output.mkv -A input.mkv sound.ac3 

The -A switch makes sure no sound is taken from input.mkv. See the examples section for more.

For Windows, there exists the MKVToolnix GUI, which would make this a little easier:

In Ubuntu and similar distros, there should be the mkvtoolnix-gui package.

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