What is MPEG-1?
Uncompressed video files are huge. MPEG, pronounced /EM-PEG /, is an abbreviation for a group of moving images that was created in 1988 to create a standard for video and sound transfer. MPEG is most often used to indicate an ISO/ITU standard that are used to compress digital video and audio data such as music, video and movies. ISO/ITU refers to two groups: International Organizations for Standards and International Telecommunications Union; The reference to both means that the standard was developed together. Currently, MPEG-1 for video CD, MPEG-2 for DVD and digital TV, MPEG-4 for audio and visual data, MPEG-7 for META-DAT and MPEG-21 for digital rights infrastructure. The MPEG-1 was the first, the standard has been completed since 1991. Although it was first optimized for less resolution and frame frequency-352x240 pixels at 30 frames/s (FPS) or 352x288 pixels at 25 fps-capable of resolution up to 4095x4095 at 60 frames. OptimalThe transmission speed is 1.5 MB/s, but may be higher if necessary.
The two smaller resolution, which has been optimized by MPEG-1, are NTSC and PAL/SECAM standard. NTSC is an abbreviation for the National Television System Committee is a body that has created a TV broadcast standard in most America and parts of Asia. PAL and Secam are two other television standards. PAL means a phase alternating line and is originally developed in Germany and is used internationally. Secam means sequential Couleur Avec Memoire and is a television standard developed in France and is used internationally. High -resolution television (HD) has replaced all three.
VideoMPEG in MPEG-1 and MPEG-2 consists of data layers. The order is: The Layer video sequence is followed by a group of images, then a picture layer and finally a cut layer. MPEG-1 and MPEG-2 use compression algorithm to select "minimum set" of ORI informationGinal and removes some of the built -in redundancy. This is called "loss -making" coding technique, because when the data is decoded, it is not identical to the original: some date was "lost". An alternative is the technique of "lossless", in which decoded data is identical to the original.