Adtec digital mediaHUB-HD 422 (version 1.01.10_M_2) Manual - Manual (Page 18)

Definitions
Item Function Options
API
Commands
Status
Shows current status and provides encoder
control. Encode - begins encoding
Stop - stops encoding
. ECMD REC
- encode
.ECMD STP -
stop
Video Rate rate at which video signal is being encoded
user-defined using <left/right arrow> and
<select> buttons.
Review Technical Specifications for full
details on acceptable ranges.
*.ECMD VRT
CODEC
type of video compression used during
encode. MPEG 2
MPEG 4 AVC
*.ECMD VEN
Chromatype chrominance; video color-component
420
422
*.ECMD CHT
Video Input selects type of video input
Composite
SDI
*.ECMD INP
GOP Type
Group of Pictures type as open or closed
GOP is expressed as one command, i.e.,
*.ECMD GOP [type] [structure] [size]
Open
Closed
*.ECMD GOP
0 = open
1 = closed
GOP Structure Group of Pictures structure (format)
I
IP
IBBP
*.ECMD GOP
3 = I
2 = IP
0 = IBBP
GOP Size Group of Pictures size
User-defined
1-30 in increments of 1 *.ECMD GOP
1-30
SDI Passthru
provides a re-clocked SDI loop for the
encoder.
If enabled, the decoder will calculate and use
the max video bitrate for the current
TransMuxRate setting.
On
Off
*. ECMD SPT
Encoder
Latency adjusts encoder latency. Affected by video
rate, frame size and rate, and GOP structure.
LONG: latency measures close to 1 second
NORMAL: latency is approximately 1/2
second. Best option for standard
transmission and contribution.
LOW: latency approximately three (3) frames
less than the NORMAL setting.
VERYLOW: latency approximately five (5)
frames less than the NORMAL setting.
*.ECMD ELA
Note: the Adtec mediaHubHD 422 encoder function does not support MPEG1 Layer 3 or MP3.
Latency Notes:
When encoding PAL video with VERYLOW latency, we recommend using IP GOP Structure if the decoder is TT
1260. Otherwise, the TT 1260 will underflow video. •
Long IBBP GOPs will produce higher latency over short IP GOPs. •
Short IP GOPs at lower bit rates produce lower quality video. •
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