implementations of Advanced Simple Profile and Xvid that implements both profiles) are all technically identical on the decoder side. A point of comparison would be that an MP3 file can be played in any MP3 player, whether it was created through iTunes, Windows Media Player, LAME, or the common Fraunhofer encoder. Simple Profile (SP) Simple Profile is mostly aimed for use in situations where low bit rate and low resolution are mandated by other conditions of the applications, like network bandwidth, device size etc. Examples are mobile phones, some low end video conferencing systems, electronic surveillance systems etc. Advanced Simple Profile (ASP) The Advanced Simple Profile was not included in the original standard. Its notable technical features relative to the Simple Profile, which is roughly similar to H.263, include: Support for "MPEG"-style quantization Support for interlaced video Support for B pictures (a.k.a. B-frames) Quarter Pixel motion compensation (Qpel) Global motion compensation (GMC) The MPEG quantization and interlace support are designed in basically similar ways to the way it is found in MPEG-2 Part 2. The B picture support is designed in a basically similar way to the way it is found in MPEG-2 Part 2 and H.263v2. The quarter-pixel motion compensation feature of ASP was innovative, and was later also included (in somewhat different forms) in later designs such as MPEG-4 Part 10, HEVC, VC-1 and VVC. Some implementations of MPEG-4 Part 2 omit support for this feature, because it has a significantly harmful effect on the speed of software decoders and it is not always beneficial for quality. The global motion compensation feature is not actually supported in most implementations although the standard officially requires decoders to support it. Most encoders do not support it either, and some experts say that it does not ordinarily provide any benefit in compression. When used, ASP's global motion compensation has a large unfavorable impact on speed and adds considerable complexity to the implementation. Simple Studio Profile (SStP) The MPEG-4 Simple Studio Profile (SStP), or ISO/IEC 14496-2, has six levels going from SDTV to 4K resolution. MPEG-4 SStP allows for up to 12-bit bit depth and up to 4:4:4 chroma subsampling, using Intra-frame coding only. MPEG-4 SStP is used by HDCAM SR. Patent holders The following organizations hold patents for MPEG-4 Visual technology, as listed in the patent pool administered by MPEG LA. Criticisms MPEG-4 Part 2 has drawn some industry criticism. FFmpeg's