Grass Valley Switcher Products - Manual (Page 143)

Switcher Products — Protocols Manual 143
Image Metadata File Format
still store does not use this line rate itself as it is unable to interpolate line
rates if this rate differs from the rate that the system is currently set to.
However this information is preserved for future use or for information
purposes.
23.97 Hz or 24Hz would be represented by 24.
25 Hz would be represented by 25.
29.97 or 30.0 Hz would be represented by 30.
47.95 or 48 Hz would be represented by 48.
50 Hz would be represented by 50
59.94 or 60 Hz would be represented by 60.
Example: 720p at 60 Hz frame rate would be:
60 * 2
8
60 (decimal) in upper 8 bits
1 * 2
6
Progressive Scan bit in bit 6
3 1280 x 720 image format
Example: 1080i at 29.97 Hz frame rate would be:
30 * 2
8
30 (decimal) in upper 8 bits
4 1920 x 1080 image format
Refer to Table 126 for a representation of the bit arrangement.
Still Store Output Control
When images are created (especially when they are fenced or when an ani-
mation is looped), the author makes decisions about how the image should
appear when output from the still store. A set of “output” parameters in the
image metadata file convey these instructions to the still store. The switcher
operator has the opportunity to change these settings if they don’t work for
a specific situation, but the metadata values provide a starting point for
those adjustments.
Table 126. 0xAC Image Line Rate Detail
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Frame Rate Reserved Prog. Bit Image Format
24 = 24 or 23.97 Hz
30 = 30 or 29.97 Hz
48 = 48 or 47.95 Hz
50 = 50 Hz
60 = 60 or 59.94 Hz
0
0 = interlace
1 = progressive
1 = 525/60
2 = 625/50
3 = 1280 x 720
4 = 1920 x 1080