Video index coding – Grass Valley 8990ARC v.3.0 User Manual
Page 20
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8990ARC Instruction Manual
Configuration
Video Index Coding
In Video Index Coding, video source data can be inserted in the video input
signal on lines 11 and 324 for 625, on lines 14 and 277 for 525, to identify the
signal line standard and aspect ratio. If this information is present and the
8990ARC Video Index Control function is enabled in one of three Video
Index Coding modes and the module output mode matches the input, the
module will pass the signal as is. If the output mode does not match, the
module will use the selected conversion mode (see
). The Video Index coding is passed through to the
8990ARC output unaltered.
This module supports three modes of Video Index Coding: Standard, Mod-
ified, and Custom.
Standard Video Index Coding
Support for Standard Video Index Coding is based on the SMPTE RP-186
standard. In Standard mode, the three least significant bits (b0, b1, and b2)
of the first byte (octet) contain the aspect ratio information of the video.
Refer to
for the definition and how this information is interpreted
by the module. Note that the module ignores the line rate.
Table 4. Standard Video Index Coding
AID Value (b2, b1, b0)
Definition (AID)
Selected Output Format
Resulting Conversion Mode
000
No information
None
Mode 1:Bypass
001
525/59.94 4:3
4x3
Mode 1:Bypass
16x9
Mode 2: Pillarbox
010
625/50 4:3
4x3
Mode 1:Bypass
16x9
Mode 2: Pillarbox
011
Reserved
None
Mode 1:Bypass
100
Reserved
None
Mode 1:Bypass
101
525/59.94 16:9
4x3
Mode 2: Letterbox
16x9
Mode 1: Bypass
110
625/50 16:9
4x3
Mode 2: Letterbox
16x9
Mode 1: Bypass
111
Reserved
None
Mode 1:Bypass