Noise, Ntsc, Overscan area – Grass Valley ProCoder 3 User Manual

Page 201: Progressive download, Quicktime, Realmedia, Glossary

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ProCoder 3

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Using ProCoder

Helpful Hints

ProCoder

Reference

Glossary

Index

Glossary

Noise

For video, typically refers to noticeable dots, lines, or patterns that should not be in
the video. Noise is generally noticeable in poor-quality source video.

NTSC

Short for North American Television Standards Committee. NTSC defines a particular
way a video signal can be communicated. The NTSC broadcast format is used
primarilly in the United States, Canada and Japan. NTSC signals cannot be displayed
by non-NTSC devices, such as PAL format televisions. NTSC signals are displayed at
29.97 frames per second.

Overscan Area

Most video output devices, such as televisions, don’t show the entire video frame
that is available. A small amount of the video’s edges is hidden and not shown.
Essentially, the video image shown is slightly smaller than the actual image being
received. The unseen edges are called the overscan area.

PAL

Short for Phase Alternating Lines. PAL defines a particular way a video signal can be
communicated. The PAL broadcast format is used primarilly in Asia (except Japan),
Australia and Europe. PAL signals cannot be displayed by non-PAL devices, such as
NTSC format televisions. PAL signals are displayed at 25 frames per second.

Progressive Download

A method of viewing video where the viewer receives enough of the video file to start
playback while it continues to receive the remainder of the video during playback.
Progressive download allows the viewer to start watching the video before it has
been fully downloaded.

QuickTime

Apple’s popular format for audio and video playback. QuickTime supports a variety of
additional interactivity features though they are not used often. Mac OS systems use
QuickTime as the primary video format.

RealMedia

A popular streaming video format created by RealNetworks. RealMedia files provide
varying quality video depending on the capabilities of the client machine and the
encoded video.

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