Add missing streams
If you had loaded a video file with audio streams via the Video Only or Audio Only option or if you deleted one of the two media events referring to a video file (by ungrouping it first or with Edit | Group | Remove from) you can quickly recreate the media event for the missing audio or video stream that is stored in the media file.
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Right-click the event and choose Add Missing Stream for Selected Event.
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A new track is created directly below (audio stream) or above (video stream) the clicked event containing an event of the same length and start time with the corresponding media stream.
The two events are grouped
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