| abstract
| - The Moving Picture Experts Group (MPEG) is a working group of ISO/IEC charged with the development of video and audio encoding standards. Since its first meeting in 1988, MPEG has grown to include approximately 350 members from various industries and universities. MPEG's official designation is ISO/IEC JTC1/SC29 WG11. MPEG has standardized the following compression formats and ancillary standards:
* MPEG-1: Initial video and audio compression standard. Later used as the standard for Video CD, and includes the popular Layer 3 (MP3) audio compression format.
* MPEG-2: Transport, video and audio standards for broadcast-quality television. Used for over-the-air digital television ATSC, DVB and ISDB, digital satellite TV services like DirecTV, digital cable television signals, and (with slight modifications) for DVD video discs.
* MPEG-3: Originally designed for HDTV, but abandoned when it was discovered that MPEG-2 was sufficient for HDTV.
* MPEG-4: Expands MPEG-1 to support video/audio "objects", 3D content, low bitrate encoding and support for Digital Rights Management. A new (newer than MPEG-2 Video) higher efficiency video codec is included (an alternative to MPEG-2 Video), see H.264.
* MPEG-7: A formal system for describing multimedia content.
* MPEG-21: MPEG describes this future standard as a multimedia framework.
- An MPEG is an acronym meaning "medium-power electric gun". This denotes AEG's of good quality and relatively low price. MPEG's can be considered the most popular and common airsoft guns around.
- |In many cases a quality setting of 2.5 will give the same results as a higher setting. A simplified explanation is that this setting works on a threshold basis, telling the encoder how far to look for certain things it needs to find. But in most cases it should be able to find those things without needing to take all of the allowed time. 2.5 should be fine for most material, and higher settings (which can slow down rendering significantly) should be reserved for problematic content.Two-pass can improve quality, but I think that the improvement is overrated by many people. With two-pass, the encoder makes a pass over the content to analyze and see which areas need to have a higher bitrate allocated to them. Then the second pass is done according to the findings of the first pass. More bandwidth is given to harder-to-encode scenes, while less is given to easier material. But the "gotcha" is that -- no matter how you allocate your bitrate -- the average quality of your video is still controlled by the average bitrate setting. Yes, two-pass encoding can make more efficient use of that bitrate, but the average bitrate setting still has a lot of control over the outcome.If you aren't trying to squeeze a ton of material onto a disc, I recommend constant bitrate. |}
- MPEG (an acronym for the Moving Picture Experts Group) is a group that first met in 1988 for the purpose of developing standards for audio and video compression (the "MPEG" standard). MPEG is a compression scheme for full-motion video images. It uses JPEG for the compression of individual frames and also uses other lossy techniques to compress data between frames. MPEG is inherently lossy and the high compression ratio of JPEG is only possible with the lossy compression. MPEG has standardized:
* MPEG-1 to compress VHS quality video on a CD-ROM at a rate of 100-1. MPEG-1 Layer 3 is a widely used audio compression format known as MP3.
* MPEG-2 to be used for broadcast-quality television through digital satellite and cable services.
* MPEG-3 originally for HDTV but abandoned in favor of a modified form of MPEG-2.
* MPEG-4 to expand MPEG-1 to include 3D content and support for digital rights management. MPEG files frequently have an .mpg file extension.
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