MPEGvideopakkaus

MPEGvideopakkaus refers to the family of standards developed by the Moving Picture Experts Group (MPEG) for the compression of digital video. These standards aim to reduce the amount of data required to represent video, making it feasible for storage and transmission over networks. The core principle behind MPEG video compression is to exploit redundancies within the video signal. This includes temporal redundancy, where consecutive frames often share a lot of similar information, and spatial redundancy, where areas within a single frame are often uniform or repetitive.

MPEG standards employ various techniques to achieve this compression. Motion estimation and compensation are key components, where the system predicts the movement of objects between frames and only encodes the differences. Intra-frame prediction, similar to JPEG for still images, is used to compress individual frames by predicting pixel values from neighboring pixels within the same frame. Transform coding, typically using the discrete cosine transform (DCT), converts pixel data into frequency components, allowing for more efficient quantization and discarding of less visually significant information.

Commonly known MPEG video standards include MPEG-1, MPEG-2, MPEG-4, and H.264 (also known as AVC or MPEG-4 Part 10). Each successive standard generally offers improved compression efficiency and features, catering to different applications ranging from VCDs and DVDs to high-definition television and internet streaming. The choice of a specific MPEG standard depends on factors such as desired video quality, available bandwidth, and processing power.