What does x264


Published by info_eog38zh0Category (ies): Home theater

x264: Designates a free, cross-platform codec for the H.264 video format and is published under the GNU license. As an H.264 encoder, x264 works much more efficiently than codecs based on the simpler MPEG-4 ASP (such as the DivX codec up to v6) or those encoders that use the even older MPEG-2 method.

This means that compared to earlier codecs, x264 delivers better image quality at a given data rate or achieves a higher level of compression for a given quality. x264 is based on the most complex and powerful profile, the high profile, of the H.264 standard (details in the corresponding article). In addition, x264 is able to carry out certain calculations in parallel, so that symmetrical multiprocessor systems can be optimally used. However, some functions of the H.264 standard have not (yet) been implemented in the x264 codec, such as the error correction of the baseline profile. It should also be noted that x264 - like any H.264 codec - is significantly more computationally intensive than the simpler MPEG-4 ASP-based codecs.

Encoding thus requires more time and greater demands are placed on the system for playback. Playback with processors below 800 MHz can therefore cause problems, especially if they do not have the SSE instruction set. In contrast to, for example, XviD or DivX, the x264 codec does not contain a decoder in the official version. In order to be able to play videos compressed with x264 on the PC, additional software is required. Since such videos conform to the H.264 standard, theoretically any H.264-compatible decoder can be used.