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Video Compression

Compression is a way to reduce the file size of video data (either a file or stream) while maintaining acceptable quality. Lossy compression means that some quality is lost; Lossless compression retains full quality.

There are many ways to compress video, all involving a codec (compressor/decompressor). To view a video compressed with a particular codec, you need to have that codec installed. In most cases this happens without you being aware of it, for example:

The following compression ratios are often used when compression video data: