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Hour 23. Advanced Video and Multimedia > Compression and Video Codecs

Compression and Video Codecs

The reason that a video file won't play on a particular computer has to do with compression. Remember that the video we captured earlier was at 640×480 screen resolution. A single compressed JPG image of that size could easily be 600–900KB in size—as you might note after you save a scanned image or a downloaded photo from a good digital camera (not a camcorder).

At 30 frames per second, each second of video of this quality is more than 18MB in size and requires a lot of processing to save, play back, and display on a monitor. So, software is required to compress and decompress video—that software used is called a codec.


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