![]() Click Add Source Files to import any streams you want to mux into your output video, making sure to include your original video stream and the audio track you stretched in Audacity. After installing, make sure to follow the links to download and install MKVToolNix GUI if necessary. Syncing the stretched audio track with MKVToolNix GUIÄownload MKVToolNix from here. mkv, you'll need to look for a tool that supports adding a delay to that container. Note that the rest of this guide assumes that you're muxing the stretched audio track along with the original video stream into an. This makes the entire process of stretching audio to fit a video unsuitable for millisecond-dependent audio content like dubs, but it can be sufficient enough for scores and audio commentaries once adequately synced up. Due to the stretched audio no longer matching the timestamps of the original video, it'll be impossible to sync both together as precisely as the original. Click OK and wait for Audacity to process the track - this shouldn't take more than a minute to complete.Ĭhances are that your newly-stretched audio track will now be out of sync with your original video stream.the length that you want the audio track to be stretched to): In the dialogue that appears, select the new desired length of your audio track (i.e. Select the entirety of the imported audio track using Ctrl A. Import the audio track you want to stretch into Audacity using File > Import > Audio, or Ctrl Alt I. How to stretch an audio track with Audacity You may be able to minimise or even entirely eliminate this change of pitch by determining the delay to be added, manually adding it using Audacity's Silence filter and then using the Change Speed filter, but because I was dealing with a relatively unimportant audio commentary track, a slightly deeper pitch wasn't enough of a deal-breaker for me to warrant spending the extra time on. ![]() Note: This method does come with the downside of changing the pitch of the audio track slightly. I was able to accomplish this using the Change Speed filter and then adding an initial delay to the track using the MKVToolNix GUI.
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