This appears to work fine, but when I play the resulting output video, and select the new audio stream, it sounds all squeaky (bit like Mickey Mouse on steroids).įor the avoidance of doubt, the original (default) audio stream (and the video) still work fine in the output file. This is the command I am using: ffmpeg -i input1.mkv -i input2.mp3 -map 0 -map 1 -c copy output.mkv
I am trying to add an additional audio steam (MP3) to an existing MKV file which currently contains a video and single audio stream, such that the output will have the video, and two alternative audio streams.
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