Video formats are not "assembled" unless one is "de-interlacing" a video sequence.--> An interlaced video frame is distinguished from a progressive scan frame, where the entire frame is sent as a single intact entity. As above, a frame may be split into fields – odd and even (by line "numbers") or upper and lower, respectively. In NTSC, the lower field comes first, then the upper field, and that's the whole frame. The basics of a format are Aspect Ratio, Frame Rate, and Interlacing with field order if applicable: Video formats use a sequence of frames in a specified order. In some formats, a single frame is independent of any other (such as those used in computer video formats), so the sequence is only one frame. In other video formats (such as the Bruch sequence in PAL), frames have an ordered position. Individual frames within a sequence typically have similar construction. However, depending on its position in the sequence, frames may vary small elements within them to represent additional information. For example, MPEG-2 compression, may eliminate the information that is redundant frame-to-frame in order to reduce the data size, preserving the information relating to changes between frames. See Video Compression for further explanation, and particularly I-frame or Key-frame.
Analog Video Formats
Blanking region
The video format consists of more information than the visible content of the frame. Preceding and following the image are lines and pixels containing synchronization information or a time delay. This surrounding margin is known as a blanking interval; the horizontal and vertical front porch and back porch are the building blocks of the blanking interval.
Digital Video Formats
These are MPEG2 based terrestrial broadcast video formats
These are strictly the format of the video itself, and not for the modulation used for transmission.
See List of codecs
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Broadcast video formats |
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625 lines
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Hidden signals
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Defunct systems
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| Digital |
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Technical issues
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