Demultiplex Preview

If you have a pattern-based multiplexer you can preview the camera you are interested in very quickly without rendering an effect.  This is a great way to preview individual cameras faster than real-time. 

  1. You will need to determine if the multiplexed footage is a pattern-based rotation.  This can be done by advancing one frame or field at a time.  If your camera view changes each time you advance one frame at a time it is most likely rotating on a set pattern. The most obvious pattern would be something like camera 1, camera 2, camera 3, camera 4, camera 1, camera 2, camera 3, camera 4, etc.  In that case every fourth frame is camera 1.  The other not so obvious pattern would be some thing like camera 1, camera 2, camera 2, camera 2, camera 3, camera 1, camera 2, camera 2, camera 2, camera 3, camera 1, etc.  In this case camera 1 would be every fifth camera even though there are only three cameras. 

  2. Once you have determined this you will need to find out how many cameras you have and/or how may frames they are in the camera rotation. 

  3. You can use a clip or create a sequence of the multiplexed clip.  Once you have done this, you can advance to the camera you are interested in. 

  4. Once you are on the camera you wish to preview, mark an In mark and hit the + key next to your number keypad.  Make sure it is the + key by the number keypad, the one on the main part of your keyboard will not work correctly.  Once you click on this you will see a white box appear on the Source Monitor with a + sign on it. 

  5. Enter in the number of images until the rotation repeats your target camera.  Now using the Enter key next to the number keypad click and hold down the Enter key.  You will see a fast demultiplex preview of your camera. 

You can do this for each of your camera views.  All you have to do is go to the beginning of your sequence or clip and find the first frame of the camera you want and repeat the steps above.  Remember that this is a preview, nothing has been rendered.  This is a great way to preview multiplexed footage very quickly.   

Product: Avid Xpress
System(s): All
Versions: All
Issue ID: 43
Keywords: demultiplex, dplex, preview,preview multiplexed cameras,multiplex, issue ID 43