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Method to automatically line up separately recorded video and audio Disclosure Number: IPCOM000234863D
Publication Date: 2014-Feb-11
Document File: 3 page(s) / 200K

Publishing Venue

The Prior Art Database


A method is disclosed that allows a user to line up multiple video and audio tracks that have been recorded separately by generating visual and auditory synchronisation points.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 46% of the total text.

Page 01 of 3

Method to automatically line up separately recorded video and audio

A common problem when dealing with video recording editing is the lining up the audio and video which are often captured via two separate sources, during the video editing process. Examples of when you might want to do this include:

  - Recording a screencast, with a voiceover explaining what you are doing: to maximise the framerate of the video recording, it is often a good idea to capture the sound separately on another device.

  - Recording a presentation in an conference hall: to get the best view of the screen and presenters, the camera may have to be quite far back into the room,

which means a lot of ambient sound is picked up, therefore it is a good idea to record also a separate audio-only source from right at the front of the auditorium, near the speaker(s).

  The problem can be avoided by recording audio and video from the one source - however, in some situations such as the examples above, this is not a good solution. Video editing software allows the user to import the video and audio as two separate tracks, and then visualises the data as movable rectangles. To line up the audio and video, the user can drag one rectangle or the other slightly to the left or right, test and iterate until they have them lined up. Whilst this doesn't sound like a bad solution, it can in fact be very slow and painful, as video editing is very resource hungry, and so the iterative process can be very slow and unresponsive

when you're dealing with large files.

  The method disclosed suggests a way in which two separately recordings, one video and one audio, can be automatically lined up at the beginning of the post-editing process, so that the user does not need to go through any slow iterative process.

  (Example of video editing software: Corel VideoStudio. At the bottom is the timeline-style view with separate rows representing different video, audio and overlay tracks - the coloured rectangles here are the things you would drag around to carry out the manual iterative line-up process)

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    A piece of video editing software that more comprehensively tries to address this problem is Adobe Premier. It uses a method for lining up video and audio tracks... (this from the Adobe documentation):
"Synchronizing clips aligns multiple clips in the Timeline panel.

After synchronizing the clips, you can create a merged clip.

To synchronize clips in the Timeline panel, first edit the clips into
the Timeline panel, and then do one of the following:
Align the clips manually by dragging them into place until they are

Align the clips using the Synchronize function. To do so, do the
Select the clips you wish to synchronize.

Choose Clip > Synchronize.

The Synchronize dialog launches. Choose from one of the
following options for the point of synchronization:
- Based on the Clip Start
- Based on the Clip End
- Based on matching timecode
- Based on clip markers"

    The drawback of t...