The x264 QuickTime Codec is a QuickTime Image Compression Component which uses the free, open source x264 H.264/AVC encoder. It can produce H.264 encoded video faster than the Apple-provided H.264, with more configurable options and better quality. Just install it, then choose "H.264 (x264)" in any QuickTime image compression window.

The codec interface supports automatic multipass encoding and has an options window for setting x264 encoding options. If you have multiple CPUs, they are automatically detected and x264 will try to encode in multiple threads for you.

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