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Words starting with mpeg4

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  • mpeg-1 — (compression, standard, algorithm, file format)   The first MPEG format for compressed video, optimised for CD-ROM. MPEG-1 was designed for the transmission rates of about 1.5 Mbps achievable with Video-CD and CD-i. It uses discrete cosine transform (DCT) and Huffman coding to remove spatially redundant data within a frame and block-based motion compensated prediction (MCP) to remove data which is temporally redundant between frames. Audio is compressed using subband encoding. These algorithms allow better than VHS quality video and almost CD quality audio to be compressed onto and streamed off a single speed (1x) CD-ROM drive. MPEG encoding can introduce blockiness, colour bleed and shimmering effects on video and lack of detail and quantisation effects on audio. The official name of MPEG-1 is International Standard IS-11172.
  • mpeg-1 audio layer 1 — (audio, compression, algorithm)   (MP1) A simple 32-subband audio compressor using a floating point representation for subband samples. Resolution and scale factor are stored for groups of 12 subsamples. MP1 is only used for Philips DCC Digital Compact cassette with data rates of 384 kbps.
  • mpeg-1 audio layer 3 — (music, file format)   (MP3) A digital audio compression algorithm that acheives a compression factor of about twelve while preserving sound quality. It does this by optimising the compression according to the range of sound that people can actually hear. MP3 is currently (July 1999) the most powerful algorithm in a series of audio encoding standards developed under the sponsorship of the Moving Picture Experts Group (MPEG) and formalised by the International Organization for Standardization (ISO). MP3 is very different from Layer 2, using an additional MDCT layer to increase frequency resolution. Its scale factor groups are more optimised for the human ear, and it uses nonlinear sample quantisation and Huffman coding. MP3 files (filename extension ".mp3") can be downloaded from many websites and can be played using software available for most operating systems (also downloadable), e.g. Winamp for PC, MacAmp for Macintosh, and mpeg123 for Unix. MP3 files are usually downloaded completely before playing but streaming MP3 is also possible. A program called a "ripper" can be used to copy a selection from a music CD onto your hard disk and another program called an encoder can convert it to an MP3 file.
  • mpeg-1 layer 3 — MPEG-1 audio layer 3
  • mpeg-2 — (compression, standard, algorithm, file format)   A variant of the MPEG video and audio compression algorithm and file format, optimised for broadcast quality video. MPEG-2 was designed to transmit images using progressive coding at 4 Mbps or higher for use in broadcast digital TV and DVD. An MPEG-2 player can handle MPEG-1 data as well. MPEG-2 has been approved as International Standard IS-13818.
  • mpeg-2 aac low profile — (compression, standard, algorithm, file format)   A successor of MP3 allowing transparent coding at data rates of 75-80% of that of MP3. It is very different from MP3, only used MDCT, no subband coding.
  • mpeg-2 lsf — MPEG-2 Low Sampling Frequencies Extention
  • mpeg-2 low sampling frequencies extention — (compression, standard, algorithm, file format)   (MPEG-2 LSF) An extension of MPEG-2, mostly used with MPEG-2 audio layer 3 because the aim was medium quality at low bit rates, not lower sampling frequencies.
  • mpeg-2 mc — MPEG-2 Multi Channel Extention
  • mpeg-2 multi channel extention — (compression, standard, algorithm, file format)   (MPEG-2 MC) An extension of MPEG-2 that uses up to 5 channels and about 1200 kbps.