A video stream can contain between 24 to 30 frames per second.
A TV quality frame (640x480x24bits/pixel) consumes around 921,000 bytes. This
equates to 27MB per second of just video data alone. The compression ratio
of lossless methods (e.g., Huffman, Arithmetic, LZW) is not high enough to
distribute video over a network like the Internet. Therefore a better means
of compression for video and audio files is necessary.
Video compression algorithms were created to enable video to
be saved on a computer. A compressor algorithm takes a original uncompressed
image or /video and reduces its size. Because of the smaller size, the speed
requirements for the storage devices are greatly reduced. To play back the
compressed data, a decompression algorithm is used to decompress the data
so it can be displayed on the screen.
MJPEG is a standard single-frame compression algorithm. Each
frame is compressed using JPEG compression. Being a standard type of encoding,
MJPEG files created on a computer with a software codec or hardware capture
board can be played on another computer using another MJPEG codec or another
hardware capture board. CLICK
HERE TO DOWNLOAD AN EXCELLENT VIDEO CODEC
Here's one example of when to use video compression:
You are capturing video but the capture program is dropping too many frames.
If you are capturing uncompressed video, then your hardware storage device
(i.e. hard drive) may not be able to keep up with the amount of data that
is being captured. You will improve the frame rate using a video compression
codec.
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