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x264 is a free and open-source software library and a command-line utility developed by VideoLAN for encoding video streams into the H.264/MPEG-4 AVC video coding format. [2] It is released under the terms of the GNU General Public License .
x264 is a GPL-licensed H.264 encoder that is used in the free VideoLAN and MEncoder transcoding applications and, as of December 2005, remains the only reasonably complete open source and free software implementation of the standard, with support for Main Profile and High Profile. [10] A Video for Windows build is still available.
x264 – H.264/MPEG-4 AVC implementation. x264 is not a codec (encoder/decoder); it is just an encoder (it cannot decode video). OpenH264 – H.264 baseline profile encoding and decoding OpenVVC [ 1 ] an VVC /H.266 Real Time - Decoder for Mac OS , Windows , Linux and Android and special Version of FFmpeg , [ 2 ] which was used for Ateme ...
Some features are only supported by a few containers: Attachments (additional files, such as fonts for subtitles) are only supported in Matroska, [41] MP4 and QTFF. M2TS supports attachments as multiple files in a specific file structure: fonts for subtitles are in .otf files in the /BDMV/AUXDATA/ directory.
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
The VideoLAN project also hosts several audio/video decoding and decryption libraries, such as libdvdcss which allows the content of CSS protected DVDs to be unscrambled, x264 which can encode H.264/MPEG-4 AVC video, x265 which can encode HEVC video, x262 which can encode MPEG-2 video, dav1d which can decode AV1 video, libdca which can decode DTS audio, and the git repository of the multimedia ...
Variance Adaptive Quantization (VAQ) is a video encoding algorithm that was first introduced in the open source video encoder x264.According to Xvid Builds FAQ: "It's an algorithm that tries to optimally choose a quantizer for each macroblock using advanced math algorithms."
x264 (encoder only; supports some of Hi422P and Hi444PP features) FFmpeg (decoder only) MPEG-4 AVC variants: MPEG-4 Web Video Coding or MPEG-4 Part 29 – a subset of MPEG-4 AVC baseline profile; XAVC; HEVC (High Efficiency Video Coding, H.265, MPEG-H part 2) x265 (encoder only) Versatile Video Coding (H.266, VVC)