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[Anonymous84]

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[aedipuss]

i'd suggest using an audio editor like the free audacity to create a 9 min long audio file. you can just put your 3 min one on the timeline 3 times and then save out the new long version.

[jagabo]

Just append the audio in mkvmerge until it's long enough. You can do it in MkvMergeGUI and look at the command line it generates to get an example.

[abolibibelot]

Just append the audio in mkvmerge until it's long enough. You can do it in MkvMergeGUI and look at the command line it generates to get an example.

Isn't there a risk of glitches at the junctions when proceeding like this ?