The codec. Released under the GPL license, x264 is arguably the most successful video codec of the 2010s. For the release, the group uses a 2-pass encode. This means the encoder analyzes the film once to find complex frames (high motion, dark shadows) and a second time to allocate bitrate precisely. The result is transparent compression—meaning the video looks identical to the BluRay source to the human eye, but at half the file size.
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