top of the High Profile, adding support for up to 10 bits per sample of decoded picture precision. High 4:2:2 Profile (Hi422P): Primarily targeting professional applications that use interlaced video, this profile builds on top of the High 10 Profile, adding support for the 4:2:2 chroma sampling format while using up to 10 bits per sample of decoded picture precision. High 4:4:4 Predictive Profile (Hi444PP): This profile builds on top of the High 4:2:2 Profile, supporting up to 4:4:4 chroma sampling, up to 14 bits per sample, and additionally supporting efficient lossless region coding and the coding of each picture as three separate color planes. Multiview High Profile: This profile supports two or more views using both inter-picture (temporal) and MVC inter-view prediction, but does not support field pictures and macroblock-adaptive frame-field coding. The standard also contains four additional all-Intra profiles, which are defined as simple subsets of other corresponding profiles. These are mostly for professional (e.g., camera and editing system) applications: High 10 Intra Profile: The High 10 Profile constrained to all-Intra use. High 4:2:2 Intra Profile: The High 4:2:2 Profile constrained to all-Intra use. High 4:4:4 Intra Profile: The High 4:4:4 Profile constrained to all-Intra use. CAVLC 4:4:4 Intra Profile: The High 4:4:4 Profile constrained to all-Intra use and to CAVLC entropy coding (i.e., not supporting CABAC). Moreover, the standard now also contains three Scalable Video Coding profiles. Scalable Baseline Profile: A scalable extension of the Baseline profile. Scalable High Profile: A scalable extension of the High profile. Scalable High Intra Profile: The Scalable High Profile constrained to all-Intra use. An accurate comparison of codecs must take the profile variations within each codec into account. See also MPEG-2 Profiles and Levels. Supported rate control strategies Videocodecs' rate control strategies can be classified as: Variable bitrate (VBR) and Constant bitrate (CBR). Variable bitrate (VBR) is a strategy to maximize the visual video quality and minimize the bitrate. On fast-motion scenes, a variable bitrate uses more bits than it does on slow-motion scenes of similar duration, yet achieves a consistent visual quality. For real-time and non-buffered video streaming when the available bandwidth is fixed e.g. in videoconferencing delivered on channels of fixed bandwidth a constant bitrate (CBR) must be used. CBR is commonly used for videoconferences, satellite and cable broadcasting. VBR is commonly used for video CD/DVD creation and video in programs. Bit rate control is suited to video streaming.