Source Input Format
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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 Template:Resx active pixels (half of PAL Template:Resx) [or Template:Resx active pixels (half of PAL Template:Resx)] and a refresh rate of 25 frames per second.[2]
- 525/59.94 SIF Format (NTSC) has a resolution of Template:Resx active pixels (half of NTSC Template:Resx) [or Template:Resx active pixels (half of NTSC Template:Resx)] 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 = Page Template:Sfrac/styles.css has no content.4/3 : Page Template:Sfrac/styles.css has no content.352/288 = Page Template:Sfrac/styles.css has no content.12/11) and "reduced" horizontally by 10:11 for NTSC (PAR = DAR : SAR = Page Template:Sfrac/styles.css has no content.4/3 : Page Template:Sfrac/styles.css has no content.352/240 = Page Template:Sfrac/styles.css has no content.10/11).
See also
References
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- ^ Page Module:Citation/CS1/styles.css has no content."Digital S Term Dictionary". JVC Professional. Retrieved 2023-04-18.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Setup of CCIR 601 multi-purpose coding system (PDF). PTT Research. 1991.
- ^ Page Module:Citation/CS1/styles.css has no content."MPEG-1 VIDEO". Berkeley Multimedia Research Center. 2009-04-12. Archived from the original on 2009-04-12. Retrieved 2023-04-18.
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