Netflix has discovered that each portion of each specific piece of content needs different codecs to look its best and, in doing so, has also enabled offline viewing of its content on mobile.
As Quartz explains, "For example, a fight scene in a darkened hallway on Daredevil is much more complex to encode, and requires more bandwidth to process, than a shot of a clear sky in the same episode. Ranges of light and dark also tend to trip up video codecs, or software that compresses and decompresses digital video. Animation like the Netflix kids show The Deep are normally easier to process than live-action titles. Netflix released a complicated 12-minute film noir earlier this year specifically to allow engineers to experiment with processing different types of video."
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