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Compression is essential for reducing the size of movies
so that they can be stored, transmitted, and played back effectively.
When exporting or rendering a movie file for playback on a specific
type of device at a certain bandwidth, you choose a compressor/decompressor
(also known as an encoder/decoder, or codec), to compress
the information and generate a file readable by that type of device
at that bandwidth.
A
wide range of codecs is available; no single codec is best for all
situations. For example, the best codec for compressing cartoon
animation is generally not efficient for compressing live-action
video. When compressing a movie file, you can fine-tune it for the
best-quality playback on a computer, a mobile device, the web, or
a DVD player. Depending on which encoder you use, you may be able
to reduce the size of compressed files by removing artifacts that
interfere with compression, such as random camera motion and excessive
film grain.
The codec you use must be available to your entire audience.
For instance, if you use a hardware codec on a capture card, your
audience must have the same hardware codec installed, or a software
codec that emulates it.
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