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.

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."

 Program Stream
 Interleaving
 PES
   Wrap-around
 DTS
 Timebase correction
 Pixel/Display Aspect Ratio

See Also

MPEG MP3

External Links

http://www.chiariglione.org/mpeg/ Official Home Page of the Moving Picture Experts Group (MPEG) a working group of ISO/IEC