Source Input Format (SIF) defined in MPEG-1, is a video format that was developed to allow the storage and transmission of digital video.[1][2]
625/50 SIF format (PAL/SECAM) has a resolution of 352 × 288 active pixels (half of PAL 704 × 576) [or 360 × 288 active pixels (half of PAL 720 × 576)] and a refresh rate of 25 frames per second.[2]
525/59.94 SIF Format (NTSC) has a resolution of 352 × 240 active pixels (half of NTSC 704 × 480) [or 360 × 240 active pixels (half of NTSC 720 × 480)] and a refresh rate of 29.97 frames per second.[2]
When compared to the CCIR 601 specifications, which defines the appropriate parameters for digital encoding of TV signals, SIF can be seen as being reduced by half in all of height, width, frame-rate, and chrominance. SIF video is known as a constrained parameters bitstream.[3]
On square-pixel displays (e.g., computer screens and many modern televisions) SIF images should be rescaled so that the picture covers a 4:3 area, in order to avoid a "stretched" look. So the computer industry has defined "square-pixel SIF" to be 320 x 240 active pixels (QVGA) or 384 x 288 active pixels, with a refresh rate of whatever the computer is capable of supporting. To reach that the SIF content need to be "expanded" horizontally by 12:11 for PAL (PAR = DAR : SAR = 4/3 : 352/288 = 12/11) and "reduced" horizontally by 10:11 for NTSC (PAR = DAR : SAR = 4/3 : 352/240 = 10/11).
^"Digital S Term Dictionary". JVC Professional. Retrieved 2023-04-18.
^ abcSetup of CCIR 601 multi-purpose coding system(PDF). PTT Research. 1991.
^. Berkeley Multimedia Research Center. 2009-04-12. Retrieved 2023-04-18.
October 24, 2023
source, input, format, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, nove. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Source Input Format news newspapers books scholar JSTOR November 2006 Learn how and when to remove this template message This article about television technology is a stub You can help Wikipedia by expanding it vte Source Input Format SIF defined in MPEG 1 is a video format that was developed to allow the storage and transmission of digital video 1 2 625 50 SIF format PAL SECAM has a resolution of 352 288 active pixels half of PAL 704 576 or 360 288 active pixels half of PAL 720 576 and a refresh rate of 25 frames per second 2 525 59 94 SIF Format NTSC has a resolution of 352 240 active pixels half of NTSC 704 480 or 360 240 active pixels half of NTSC 720 480 and a refresh rate of 29 97 frames per second 2 When compared to the CCIR 601 specifications which defines the appropriate parameters for digital encoding of TV signals SIF can be seen as being reduced by half in all of height width frame rate and chrominance SIF video is known as a constrained parameters bitstream 3 On square pixel displays e g computer screens and many modern televisions SIF images should be rescaled so that the picture covers a 4 3 area in order to avoid a stretched look So the computer industry has defined square pixel SIF to be 320 x 240 active pixels QVGA or 384 x 288 active pixels with a refresh rate of whatever the computer is capable of supporting To reach that the SIF content need to be expanded horizontally by 12 11 for PAL PAR DAR SAR 4 3 352 288 12 11 and reduced horizontally by 10 11 for NTSC PAR DAR SAR 4 3 352 240 10 11 See also EditCommon Intermediate Format CIF References Edit Digital S Term Dictionary JVC Professional Retrieved 2023 04 18 a b c Setup of CCIR 601 multi purpose coding system PDF PTT Research 1991 MPEG 1 VIDEO Berkeley Multimedia Research Center 2009 04 12 Retrieved 2023 04 18 Retrieved from https en wikipedia org w index php title Source Input Format amp oldid 1176127641, wikipedia, wiki, book, books, library,
