User:Ryan Cooley/MPEG1
MPEG-1 articles (MPEG-1, MP1, MP2, MP3) on wikipedia are complete crap. Disorganized, slanted, incomplete, misconstrued, etc. It's far easier to start from scratch than try to fix all the individual existing ones, and will give far better end results; I will copy some content from the existing articles.
Do not make any changes to this page for now. This is my mind-dump and accommodating others before I'm done will just make much, much more work for me. Put any suggestions on the Talk page, and I will eventually address them.
-RC
MPEG-1 was an early standard for lossy compression of video and audio. It was designed to compress raw video and CD audio by a factor of 1:6 without discernible quality loss, making Video CDs and Digital Video Broadcasting possible.
Perhaps the most well-known part of the MPEG-1 standard today is the MP3 audio format it introduced.
The MPEG-1 standard is published as ISO/IEC 11172.
History
The MPEG working group began development of MPEG-1 in May 1988. 15 video and 14 audio codecs proposed by members. The proposed codecs were extensively tested for objective (mathematical) and subjective (human perception) quality. The winning codecs, based on testing and computational complexity, were refined further
After 20 official meetings in various cities around the world, and 4 and a half years of development and testing, the standard was finalized and approved in early November 1992. [1]
Immediately afterwards, work began on MPEG-2 to extend MPEG-1 to address the need for higher quality video at high bitrates (3Mbps and up), and support for interlacing. Due to this similarity, all MPEG-2 decoders also support MPEG-1.
Today, MPEG-1 is by far the most widely compatible lossy audio/video format in the world. Due to its age, it can be implemented without payment of license fees. Most video players for computers include it along with their other formats. The immense popularity of MP3 audio means all 3 levels of MPEG-1 audio are playable on a very wide variety of audio hardware. The widespread popularity of MPEG-2 means MPEG-1 video is playable on most digital cable/satellite set-top-boxes, consumer digital disc and tape players.
Began development in 1988 Approved November 1992 Published August 1993 Lossy most compatible format MPEG-2
Application
VCD players DVB DAB MP3 MPEG-2 DVD players
Video
Part 2 of the MPEG-1 standard covers video.
Part 2 Dimentions 4094x4094 Datarate Constrained Parameters Bitstream
Luma Chroma
I-frames P-frames B-frames
GOP Keyframe placement
DCT Quantization Quantizer Noise Banding Ringing? (large coefficients in high frequency sub-bands) Coefficients AC DC Spatial prediction zigzag Macroblocks 16 dimentions Blockiness Motion Vectors/Estimation Black borders/Noise pel precision (half pixel IIRC) Two per block IIRC
RLE Huffman coding Others?
Spacial Complexity Temporal Complexity
CBR/VBR
Audio
Part 3 of the MPEG-1 standard covers audio.
Layers I & II
Musicam Audiophile Delay
Layer III/MP3
ASPEC Hybrid MDCT Aliasing
Systems
Part 1 of the MPEG-1 standard covers systems which is the logical layout of the encoded audio, video, and other bitstream data.
"The MPEG-1 Systems design is essentially identical to the MPEG-2 Program Stream structure." [2]
Program Stream Interleaving PES Wrap-around DTS Timebase correction Pixel/Display Aspect Ratio
See Also
References
External Links
http://www.chiariglione.org/mpeg/ Official Home Page of the Moving Picture Experts Group (MPEG) a working group of ISO/IEC