DV is a format for storing digital video clip, audio and metadata such as subtitles and closed captioning. It was launched in 1995 with the collaborations of numerous producers of video camera recorders. DV utilizes lossy compression of video clip while sound is saved uncompressed. An intra-frame video clip compression system is utilized to compress video on a frame-by-frame basis. All DV versions besides DVCPRO Progressive are videotaped to tape within interlaced video stream. Film-like framework prices are possible by utilizing pulldown transfer of movie to video clip.
DVCPRO, likewise known as DVCPRO25, is a variant of DV established by Panasonic and presented in 1995 for usage in digital news-gathering (ENG) tools. In 1996 Sony reacted with its very own professional version of DV called DVCAM. Like DVCPRO, DVCAM makes use of secured sound, which avoids audio synchronization drift that might occur on DV if a number of generations of duplicates are made.
DVCPRO50 was introduced by Panasonic in 1997 for high-value electronic news event as well as digital movie theater and also is often referred to as two DV codecs working in parallel. Comparable layouts include Sony's Digital Betacam, released in 1993, and also MPEG IMX, released in 2001. DVCPRO Progressive was presented by Panasonic for information celebration, sporting activities journalism as well as digital movie theater. Like HDV-SD, it was implied as an intermediate layout during the change time from basic interpretation to high definition video.
DVCPRO HD, also referred to as DVCPRO 100, is a high-def video style that can be taken four DV codecs that operate in parallel. While technically DVCPRO HD is a straight offspring of DV, it is used virtually specifically by specialists. Tape-based DVCPRO HD cams exist just in shoulder install variant. A similar format, Digital-S (D-9 HD), is used by JVC and utilizes videocassettes with the exact same form-factor as VHS. The main competitor to DVCPRO HD is HDCAM, supplied by Sony. It makes use of a similar compression scheme but at higher bitrate.
Tape-based DV versions, besides DVCPRO Progressive, do not support indigenous dynamic recording, therefore considerably obtained video clip is taped within interlaced video stream utilizing the pulldown transfer method, the very same technique made use of in television to transmit movies.
DV was initially created for taping onto magnetic tape. Tape is confined right into small, tool, large as well as extra-large videocassettes. Any kind of DV cassette can tape-record any type of variation of DV video. Nonetheless, makers commonly classify cassettes with DV, DVCAM, DVCPRO, DVCPRO50 or DVCPRO HD as well as suggest recording time with regards to the label posted. With proliferation of tapeless camcorder video recording, DV video clip can be recorded on optical discs, sold-state flash memory cards as well as disk drive and also utilized as computer system data. This enables easy file-sharing for such uses as archiving and also transcription.
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