Cisco D9054 Installation And Operation Manual page 65

Video Menu,
Continued
H.264, CBR Rate
Parameters:
Steps:
Description:
H.264, VBR Rate
Parameters:
Steps:
Description:
H.264, SubSampling
Parameters:
Description:
4038938 Rev A
Capped variable bit rate encoding simply means that your video
channel is encoded at a variable bit rate which is capped at a specific
value. For further information, see H.264, VBR Rate, page 4-11.
3,000,000 to 20,000,000 for H.264 MP@L4 for 4:2:0 chroma format.
3,000,000 to 25,000,000 for H.264 HP@L4 for 4:2:0 chroma format.
1 bit/s.
The video bit rate for Fixed Rate Mode.
3,000,000 to 20,000,000 for H.264 MP@L4 for 4:2:0 chroma format.
3,000,000 to 25,000,000 for H.264 HP@L4 for 4:2:0 chroma format.
1 bit/s.
The capped video bit rate for Variable Rate Mode.
Full, 3/4, 2/3 or 1/2. 2/3 horizontal resolution is not supported for
720p.
The subsampling rate.
The following table shows the lowest recommended minimum rates
with various GOP sequences at full and 3/4 horizontal
subsampling:
Video GOP Lowest Recommended Minimum
Sequence Bit Rate (Mbit/s) in Fixed Rate
Encoding
Full Horizontal
Subsampling
1 30
2 20
3 15
≥4 10
The video bit rate must always be lower than the transport stream
(TS) bit rate. For further information, see Transport Stream Rates
for the Tributaries, page B-3.
D9054 HDTV Encoder Intstallation and Operation Guide
3/4 Horizontal
Subsampling
22.5
15
11.25
7.5
4-11