Let's say I have audio.m4a and video.m2v and the video stream starts approx. 13 sec with the expected sound output but my audio.m4a immediately.

So I have to merge it with a delay! I tried already this command:

mkvmerge video.m2v audio.m4a -o output.mkv --sync 1:13000

but no effect.

Anyone can help me?


Yes. Your command structure is out of sequence; and, your particular audio would be track 0 of itself, not track 1.

mkvmerge -o output.mkv video.m2v -y 0:+13000 audio.m4a

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