Monday, 12 December 2011

Video I Frame

Thw video i frame The video track consists of a series of still images, or frames, that,
when played in sequence, appear to be moving. Frames of video are similar to
frames of film, except that you can’t see them by holding them up to the light.
Instead, you need a computer to decode the electronic information that constitutes
each frame and display it on a monitor.

Each second of video contains a specific number of still images in order to give the illusion
of motion. The number of still images, or frames, per second is called the frame rate. When
motion picture film was invented, it originally ran at a frame rate of 18 frames per second
(fps). With the advent of sound, the frame rate had to be increased to 24fps to get audio that
was in sync with the picture.

There are many different frame rates associated with HD. The reason is that when HD was
developed, it needed to be compatible with a variety of existing media: film, American analog
broadcast video, and European analog broadcast video. Each of these three potential sources
for HD defines a subset of HD frame rates:

n 24p and 23.976p. Frame rates based on film.
n 29.97p, 30p, 59.94i, 60i, 59.94p, and 60p. Frame rates based on American television.
n 25p and 50i. Frame rates based on European television.
As you’re trying to decide which frame rate to use when you shoot, you can narrow down
your options by using this list. For example, if you are doing a project in the United States,
there is no reason to shoot 25p or 50i.

Tag: video i frame, frame the video, frame i video, video i frame

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