X264 is a powerful open-source video encoding software library that is capable of compressing high-definition (HD) video files up to 50 times smaller than the original file size while maintaining excellent video quality. It is one of the best video compressors available today, used by many online video streaming services like YouTube, Netflix, and Vimeo.

The X264 encoding library uses the H.264/MPEG-4 AVC (Advanced Video Coding) standard, which is the most widely used video codec today. It provides highly efficient video compression without sacrificing video quality, making it ideal for video streaming, broadcasting, and storage.

The X264 library is highly customizable, allowing users to modify the encoding settings to produce the best quality video for their specific needs. It has a wide range of configurations, from ultra-fast encodings to high-quality video encodings.

The software takes advantage of the power of the computer’s CPU to compress the video files. X264 offers multi-threading support, which allows the software to use multiple CPU cores to perform the encoding process simultaneously. This speeds up the encoding process significantly and reduces the time it takes to encode large video files.

Another great feature of X264 is its rate control mechanism, which ensures that the output video file has a specific bit rate. This feature guarantees that the video file will be of a particular quality, file size, and bitrate, which is important when streaming or uploading videos online.