Datavideo KMU-200 Instruction Manual page 31

Level ID Max. Video
Bitrate in
kbits/s
3.0 10000
3.1 14000
3.2 (HD) 20000
4.0 20000
4.1 (FHD) 50000
Entropy
There are two coding options available for generating H.264 content:
 CAVLC (Context-Adaptive Variable Length Coding)
 CABAC (Context-based Adaptive Binary Arithmetic Coding)
CABAC encoding provides a 7-10% quality improvement over CAVLC but requires an extra
10-15% CPU. CABAC encoding is only available in H.264 Profiles Main & High. When
targeting at low-powered devices, such as older cell phones and tablets, we recommend the
Baseline Profile that uses CAVLC which requires less computing power.
GOP
GOP pattern with longer GOP length encodes video very efficiently. Shorter GOP lengths
usually work better with video that has quick movements, but they do not compress the
data rate as much. Depending on your applications, the NVS-31 MARK II offers the user 16
GOP sizes ranging from 1 to 255.
 255
 240
 200
 120
 100
 60
 50
 30
 25
 20
 15
 10
Max Frame Size Max decoding speed in
in macroblocks macroblocks per
second
1620 40500
3600 108000
5120 216000
8192 245760
8192 245760
31
Resolution, Frame Rate
(Max Stored Frames)
352×480@61.4 (12)
352×576@51.1 (10)
720×480@30.0 (6)
720×576@25.0 (5)
720×480@80.0 (13)
720×576@66.7 (11)
1,280×720@30.0 (5)
1,280×720@60.0 (5)
1,280×1,024@42.2 (4)
1,280×720@68.3 (9)
1,920×1,080@30.1 (4)
2,048×1,024@30.0 (4)
1,280×720@68.3 (9)
1,920×1,080@30.1 (4)
2,048×1,024@30.0 (4)