ISO/IEC – Information technology – Generic coding of moving pictures and associated audio information – Part 2: Video. Amendment 2 to International Standard ISO/IEC was prepared by. Joint Technical Committee ISO/IEC JTC 1, Information technology, Sub-. ISO/IEC. Third edition. Information technology — Generic coding of moving pictures and associated audio information —. Part 2: Video.
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Each picture element a pixel is then represented by one luma number and two chroma numbers. Typically, every 15th frame or so is made into an I-frame. This page was last edited on 20 Novemberat While the above generally describes MPEG-2 video compression, there are many details that are not discussed iiso details involving fields, chrominance formats, responses to scene changes, special codes that label is parts of the bitstream, and other pieces of information.
SNR [a]spatial [b]. Sometimes no suitable match is found. Reference Software Part 5: The advantage of doing this is that the image can now be simplified by quantizing the coefficients. Streaming text format Part For many applications, it is unrealistic and too expensive to support the entire standard.
A Main stream cannot be recreated losslessly. MPEG media transport Part 2: Another common practice to reduce the amount of data to be processed is to subsample the two chroma planes after low-pass filtering to avoid aliasing.
The match between the two macroblocks will often not be perfect. Multimedia compression and container formats.
The processing of B-frames is similar to that of P-frames except that B-frames use the picture in a subsequent reference frame as well as the picture in a preceding reference frame. MP4 file format Part Use dmy dates from July Open Font Format Part In the receiver or the player, 113818-2 whole process is reversed, enabling the receiver to reconstruct, to a close approximation, the original frame. The result is an 8 by 8 matrix of coefficients. Then, the macroblock is treated like an I-frame macroblock.
Video based on H. Unified Speech and Audio Coding.
H.262/MPEG-2 Part 2
This works because the human visual system better resolves details of brightness than details in the hue and saturation of colors.
All articles beginning with “ITU”. The data in each block is transformed by the discrete cosine transform DCT. The penalty of this 1388-2 is the loss of some subtle distinctions in brightness and color.
H/MPEG-2 Part 2 – Wikipedia
To allow such applications to support only subsets of it, the standard defines profiles and levels. But, if something in the picture is moving, the offset might be something like 23 pixels to the right and 4 pixels up. Information technology – Generic coding of moving 1381-2 and associated audio information: To correct for this, the encoder takes the difference of all corresponding pixels of the two macroblocks, and on that macroblock difference then computes the strings of coefficient values as described above.
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In it was extended by two amendments to include the Registration of Copyright Identifiers and the 4: It is this array that is broadcast or that is put on DVDs. Views Read Edit View history.
High Efficiency Video Coding Part 3: If the video is not interlaced, then it is called progressive video and each picture is a frame.
Retrieved 24 July Systems Program stream Part 2: Also, because of the way the eye works, it is possible to delete some data from video lso with almost no noticeable degradation in image quality.