Page 95 - DCAP303_MULTIMEDIA_SYSTEMS

Unit 5: Video

5.7.1 objectives of video editing notes
There are many reasons to edit a video and your editing approach will depend on the desired
outcome. Before you begin you must clearly define your editing goals, which could include any
of the following:
1. remove unwanted footage
This is the simplest and most common task in editing. Many videos can be dramatically improved
by simply getting rid of the flawed or unwanted bits.
2. Choose the best footage
It is common to shoot far more footage than you actually need and choose only the best material
for the final edit. Often, you will shoot several versions (takes) of a shot and choose the best one
when editing.
3. Create a flow
Most videos serve a purpose such as telling a story or providing information. Editing is a crucial
step in making sure the video flows in a way which achieves this goal.
4. add effects, graphics, music, etc
This is often the “wow” part of editing. You can improve most videos (and have a lot of fun) by
adding extra elements.
5. alter the style, pace or mood of the video
A good editor will be able to create subtle mood prompts in a video. Techniques such as mood
music and visual effects can influence how the audience will react.
6. Give the video a particular “angle”

Video can be tailored to support a particular viewpoint, impart a message or serve an agenda.

Bringing plenty of flashlights and be aware of your perimeter, so that unwanted
things are noticed before they appeared in the video.

Import a video clip in video editing software and write some message on it.

5.8 optimizing video files for CD-roM

The CD-ROMs provide an excellent distribution medium for computer-based video, because
they are inexpensive to mass produce, and they can store great quantities of information. The
CD-ROM players offer slow data transfer rates, but adequate video transfer can be achieved by
taking care to properly prepare your digital video files. Without great care, these digital files may
display poorly in low-bandwidth/high-compression environments:
1. Limit the amount of synchronization required between the video and audio. With Microsoft’s
AVI file, the audio and video data are already interleaved, so this is not a necessity, but with
QuickTime files, you should “flatten” your movie. Flattening means that you interleave the
audio and video segments together.
2. Use regularly spaced key frames, 10–15 frames apart, and temporal compression can correct
for seek time delays. Seek time is how long it takes the CD-ROM player to locate specific
data on the CD-ROM disc. Even fast 56x drives must spin up, causing some delay (and
occasionally substantial noise).

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