|
The term video commonly refers to several shortage formats for moving eye pictures: digital video formats, including DVD, QuickTime, and MPEG-4; and analog videotapes, including VHS and Betamax. Video can be recorded and transmitted in various physical media: in magnetic tape when recorded as PAL or NTSC electric signals by video cameras, or in MPEG-4 or DV digital media when recorded by digital cameras.
The size of a video image is measured in pixels for digital video, or horizontal scan lines and vertical lines of resolution for analog video. In the digital domain (e.g. DVD) standard-definition television (SDTV) is specified as 720/704/640×480i60 for NTSC and 768/720×576i50 for PAL or SECAM resolution. However in the analog domain, the number of visible scanlines remains constant (486 NTSC/576 PAL) while the horizontal measurement varies with the quality of the signal: approximately 320 pixels per scanline for VCR quality, 400 pixels for TV broadcasts, and 720 pixels for DVD sources. Aspect ratio is preserved because of non-square "pixels".
| Links |
some massive big tits in action.
girls having nasty lesbian sex on the floor.
watching this anal sex makes me go crazy.
to me there is nothing hotter than gay sex.
look at these milfs having the time of their lives.
man I would like to get a blow job tonight.
there is nothing like a good bondage power play.
with a shemale you have it both ways.
pretty girls in lesbian porn on this picture.
what gets me all horny and bothered is teen porn.
click and see how guys do it in this gay porn pic.
damn that has to hurt being so hogtied.
yummy, another hot and sexy shemale to look at.
burn baby, burn on these spanking images.
com on in to see these sexy girls in action.
I would not mid a hot pair of hot babes in my bed.
this is the orgasmic world of squirting action.
some of the most intensive cumshots ever on this bukkake page.
I would so like to juggle with these pair of huge boobs.
you can never get enough of the sexy shemales.
ID=111 - Status OK. |
A wide variety of methods are used to compress video streams. Video data contains spatial and temporal redundancy, making uncompressed video streams extremely inefficient. Broadly speaking, spatial redundancy is reduced by registering differences between parts of a single frame; this task is known as intraframe compression and is closely related to image compression. Likewise, temporal redundancy can be reduced by registering differences between frames; this task is known as interframe compression, including motion compensation and other techniques. The most common modern standards are MPEG-2, used for DVD and satellite television, and MPEG-4, used for home video.
Stereoscopic video requires either two channels — a right channel for the right eye and a left channel for the left eye or two overlayed color coded layers. This left and right layer technique is occasionally used for network broadcast, or recent "anaglyph" releases of 3D movies on DVD. Simple Red/Cyan plastic glasses provide the means to view the images discretely to form a stereoscopic view of the content.
|
