Operating the Equipment Locally
Page 4-42
Instruction Manual: evolution 5000 E5710 and E5720 Encoder
ST.TM.E10074.1
Table 4.35: Group of Pictures Structure Options
Selected Option
Description
IBBBP
(IBBBPBBBPBBBI).
IBBP
for successive B frames (IBBPBBPBBPBBPI) – default.
IBP
for operation with B frames (IBPBPBPBPBPI).
IP
for non-B frame operation (IPPPPPPPPPPI) - default for low delay mode.
IBBB
(IBBBIBBBIBBBIBBB) - professional editing standard.
IBB
IBBIBBIBBIBBIBBIBBI) - professional editing standard.
IB
(IBIBIBIBIBIBIBIBIB) - a professional editing standard.
I-Frame
(IIIIIIIIIIIIIII) - for precise editing and compression.
NOTE…
For some GOP changes operation can be seamless but this is not guaranteed.
GOP Length Option
To access the Group of Pictures (GOP) Length option, press the GOP
Length softkey in the
Video
Encoder
Menu
.
This enables the video GOP structure length to be set. The structure length
determines how regularly an I frame is transmitted. The I frame provides a
regular reference from which predicted frames can be generated, thereby
ensuring that predictions do not become wildly inaccurate.
NOTE…
Some of the settings may not be available if they are not valid for use with other current encoding
parameters. Also, changing the GOP structure automatically changes the GOP length if the current
GOP length is not compatible with the selected structure.
GOP Length
GOP Length :
+
15
—
Enter
l
Update using softkeys
Quit
l
Table 4.36: Group of Pictures Length Options
Valid Input Range
Description
Min:
1
Max:
15
GOP lengths available depend on GOP structure selected and the frame rate.
Maximum GOP lengths are 12 for 25 Hz and 15 for 29.97 Hz.
I-Frame and IP encoding have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
IBP and IB have 2, 4, 6, 8, 10, 12, 14.
IBBP and IBB have 3, 6, 9, 12, 15.
IBBBP and IBBB have 4, 8, 12.
