Source Input Format

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Source Input Format (SIF) in MPEG-1, is a video format that was developed to allow the storage and transmission of digital video. The 625/50 SIF format (PAL/SECAM) has a resolution of (360 or) 352 x 288 active pixels and a refresh rate of 25 frames per second. The 525/59.94 SIF Format (NTSC) has a resolution of (360 or) 352 x 240 active pixels and a refresh rate of 29.97 frames per second. The computer industry has redefined SIF to be 320 x 240 (QVGA) or 384 x 288 active pixels with a refresh rate of whatever the computer is capable of supporting.

[edit] See also

Digital video resolutions
Designation Usage examples Definition (lines) Rate (Hz)
Interlaced (fields) Progressive (frames)
Low; MP@LL LDTV, VCD 240; 288 (SIF) 24, 30; 25
Standard; MP@ML SDTV, SVCD, DVD, DV 480 (NTSC, PAL-M) 60 24, 30
576 (PAL, SECAM) 50 25
Enhanced EDTV 480; 576 60; 50
High; MP@HL HDTV, HD DVD, Blu-ray Disc, HDV 720 24, 30, 60; 25, 50
1080 50, 60 24, 30; 25
Visual comparison of common video/TV display resolutions
This table illustrates total horizontal and vertical pixel resolution via box size. It does not accurately reflect the screen shape (aspect ratio) of these formats, which is either 4:3 or 16:9.
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