On February 20, 2012, more than a year after the appearance of the first draft, the SD x264 TV Release Standards document was released with the goal "to bring quality control back to the SD releases". According to the document x264 has become the most advanced H264 video encoder and compared to XviD it is able to provide higher quality and compression at greater SD resolutions. It also allows better control and transparency over encoding settings. With CRF (constant rate factor) in the mix it can be ensured that a diverse array of material will get the most appropriate bitrate and not arbitrary fixed file sizes. The video container must be MP4 and AAC is used for the audio. Thirteen groups, ASAP, BAJSKORV, C4TV, D2V, DiVERGE, FTP, KYR, LMAO, LOL, MOMENTUM, SYS, TLA and YesTV signed the document and began releasing TV shows in the new format.