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Article #235

Mutliple Camera Stream Editing

#235
From: harishkry
Date: Thu, 23 Apr 1998 00:00
52 lines
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We are working on a video processing application, which requires n video
streams as input. These n streams are typically captured from n cameras
covering a "scene". For processing, this application requires that these n
video streams be of the same duration and perfectly synchronized. We are
looking at an editing software to provide us video streams which meet these
requirements.

Some of the problems we could think of as reasons for a lack of
synchronization
in the "raw video" streams are:
*     All n cameras may not have begun recording at the same time
*     One of the cameras may not have recorded a portion of the scene
*     Some cameras may have recorded additional content in that scene, which
needs to be edited out., etc.

1. How can we achieve this "synchronization" of n separate streams using an
AVID setup?

2. If a single video source, that is brought into an AVID environment, has
multiple IN-OUT points marked, how are these individual portions of the source
placed on the timeline. When creating a final output of the video stream, does
Avid automatically pick up only the "marked" portions of the video?

3. Can a IN-OUT marking that is made on one video track on the timeline be
propagated automatically to other tracks on the time line after they have been
synchronized?

4. Since we need to record each track as a separate stream, once the editing
and synchronizing is done, we would like to know about the following
situation: suppose recording begins from time zero, i.e. absolute beginning of
the track on the timeline, and the video data begins only after a certain time
on the track, then will the recording contain "blank" portions for those parts
of the track where there is no video or audio available?

5. If the "raw video" input also contains an audio track, how does Avid treat
the source. Can Avid "separate" these two?

6. Given the objective stated above, how can AVID's EDL help us?

7. Can the synchronization and editing of video tracks also be propagated to
audio tracks?

8. If the "raw video" or source footage is "pre-edited" and contains "supers",
or other sub-title information, does Avid provide any tools to "remove" such
graphics, text, titles, etc.?

9. What is the format of the output video? What are the options in terms of
file formats, viz. AVI, QT, Mpeg-1, Mpeg-2, etc.? What is the OMF format?

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From: harishkry@inf.com
Subject: Mutliple Camera Stream Editing
Date: 1998/04/23
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