Jump On The Video Band Wagon

==== ====Pocket Video Powerhttp://tinyurl.com/6pojaco==== ====Digital video is a type of video recording system that works by using a digital, rather than analog,representation of the video signal. This generic term is not to be confused with the name DV,which is a specific type of digital video. Digital video is most often recorded on tape, thendistributed on optical discs, usually DVDs. There are exceptions, such as camcorders that recorddirectly to DVDs, Digital8 camcorders which encode digital video on conventional analog tapes,and the most recent JVC Everio G camcorders which record digital video on hard disks.The terms"camera", "video camera", and "camcorder" are used interchangeably in this article.IntroductionVideo cameras come in two different image capture formats: interlaced and progressive scan.Interlaced cameras record the image in alternating sets of lines: the odd-numbered lines arescanned, and then the even-numbered lines are scanned, then the odd-numbered lines arescanned again, and so on. One set of odd or even lines is referred to as a "field", and aconsecutive pairing of two fields of opposite parity is called a frame.A progressive scanning digital video camera records each frame as distinct, with both fields beingidentical. Thus, interlaced video captures twice as many fields per second as progressive videodoes when both operate at the same number of frames per second. This is one of the reasonsvideo has a "hyper-real" look, because it draws a different image 60 times per second, as opposedto film, which records 24 or 25 progressive frames per second.Progressive scan camcorders such as the Panasonic DVX100 are generally more desirablebecause of the similarities they share with film. They both record frames progressively, whichresults in a crisper image. They can both shoot at 24 frames per second, which results in motionstrobing (blurring of the subject when fast movement occurs). Thus so, progressive scanning videocameras tend to be more expensive than their interlaced counterparts. (Note that even though thedigital video format only allows for 29.97 interlaced frames per second [or 25 for PAL], 24 framesper second progressive video is possible by displaying identical fields for each frame, anddisplaying 3 fields of an identical image for certain frames. For a more detailed explanation, seethe adamwilt.com link.)Standard film stocks such as 16 mm and 35 mm record at 24 or 25 frames per second. For video,there are two frame rate standards: NTSC, and PAL, which shoot at 30/1.001 (about 29.97)frames per second and 25 frames per second, respectively.Digital video can be copied with no degradation in quality. No matter how many generations adigital source is copied, it will be as clear as the original first generation of digital footage.Digital video can be processed and edited on an NLE, or non-linear editing station, a device built

exclusively to edit video and audio. These frequently can import from analog as well as digitalsources, but are not intended to do anything other than edit videos. Digital video can also beedited on a personal computer which has the proper hardware and software. Using a NLE station,digital video can be manipulated to follow an order, or sequence, of video clips. Avids softwareand hardware is almost synonymous with the professional NLE market, but Apples Final Cut Pro,Adobe Premiere, and similar programs are also popular.More and more, videos are edited on readily available, increasingly affordable hardware andsoftware. Even large budget films, such as Cold Mountain, have been edited entirely on Final CutPro, Apples non linear editing software.Regardless of software, digital video is generally edited on a setup with ample disk space. Digitalvideo applied with standard DV/DVCPRO compression takes up about 250 megabytes per minuteor 13 gigabytes per hour.Digital video has a significantly lower cost than 35 mm film, as the tapes can be viewed on locationwithout processing, and the tape stock itself is very inexpensive (about $3 for a 60 minute MiniDVtape, in bulk, as of December, 2005). By comparison, 35 mm film stock costs about $1000 perminute, including processing.Digital video is used outside of movie making. Digital television (including higher quality HDTV)started to spread in most developed countries in early 2000s. Digital video is also used in modernmobile phones and video conferencing systems. Digital video is also used for Internet distributionof media, including streaming video and peer-to-peer movie distribution.Many types of compression exist for serving digital video over the internet, and onto DVDs. WhileDV video is not compressed beyond its own codec while editing, the file sizes that result are notpractical for delivery onto optical discs or over the internet, with codecs such as the WindowsMedia format, MPEG2, MPEG4, Real Media, the more recent H.264, and the Sorenson mediacodec. Probably the most widely used formats for delivering video over the internet are MPEG4and Windows Media, while MPEG2 is used almost exclusively for DVDs, providing an exceptionalimage in minimal size but resulting in a high level of CPU consumption to decompress.As of 2005, the highest resolution demonstrated for digital video generation is 33 megapixels(7680 x 4320) at 60 frames per second ("UHDV"), though this has only been demonstrated inspecial laboratory settings [1]. The highest speed is attained in industrial and scientific high speedcameras that are capable of filming 1024x1024 video at up to 1 million frames per second (for veryshort time, obviously).2006 Cordin is the world leader in ultra high speed imaging technology.Depending on the camera system in use frame rates up to 200 000 000 frames per second arepossible. Very short integration times and inter frame times are standard. Gated and intensifiedmodels are available. Among other modules Cordin offers Ultra-High Speed Camera systems with1000 * 1000 Pixel at full frame rate in colour or black and white . Streak camera systems forscientific applications are available and developed with modern technology.For high speed applications in the near, middle or long wave infrared the Phoenix cameras offer

various possibilities. The InGaAs, QWIP and InSb Detectors can acquire images with a frame rateof up to 30 KHz in the wavelength range of 900 nm to 10 µm.interfaces/cablesMany interfaces have been designed specifically to handle the requirements of uncompresseddigital video (at roughly 400 Mbits/s):Serial Digital InterfaceFireWireHigh-Definition Multimedia InterfaceDigital Visual InterfaceUnified Display InterfaceDisplayPortStorage formatsEncodingAll current formats, which are listed below, are PCM based.CCIR 601 used for broadcast stationsMPEG-4 good for online distribution of large videosMPEG-2 used for DVDs and Super-VCDsMPEG-1 used for video CDsH.261H.263H.264 also known as MPEG-4 Part 10, or as AVCTheora standardized but still in development. used for video over the internet.TapesBetacam SX, Betacam IMX, Digital BetacamD1, D2, D3, D5, D9 (also known as Digital-S)

DV, MiniDV - used in most of todays consumer camerasDVCAM, DVCPRO - used in professional broadcast operationsDigital8 -DisksVideo CD (VCD)DVDHD-DVDBlu-ray DiscVisit me at my consumers product websites http://www.bestgiftsdeal.com a website that provideslinks to consumer products and article reviews. Here are links in reference to this article. DigitalVideoArticle Source:http://EzineArticles.com/?expert=Clarence_Harrell==== ====Pocket Video Powerhttp://tinyurl.com/6pojaco==== ====

Jump On The Video Band Wagon

by melhuges

Accessibility

Categories

Upload Details

Usage Rights

Statistics

Jump On The Video Band Wagon Document Transcript