Determining The Default Video Rate - Cisco D9054 Installation And Operation Manual

Determining the Default Video Rate

To Determine the Default Video Rate
1. It is recommended that you initially set the default video rates for all statmux
channels to the VBR capped bit rate or slightly lower.
You may change individual channel rates later.
Note: When the number of statmux channels is high you may typically reduce
the default video rates slightly while maintaining the same subjective quality.
If you have experience from a fixed rate service (e.g., CBR or capped VBR), it
may be a good idea to start using default video rates comparable to the previous
fixed rates.
Note: The actual default video rates in your setup will depend on your
application, the anticipated source material, and your quality requirements. The
smaller the size of the statmux pool compared to the target video quality, the
less frequently you will reach the quality limit.
2. If required, set the default video rate higher for some of the channel(s).
This improves the quality of the changed channels when the encoder is removed
from the statmux pool, when there is loss of the external reference, or loss of the
network connection.
3. Use higher default video rates for any channels with full resolution and lower
default video rates for any channels with reduced resolution.
4038938 Rev A D9054 HDTV Encoder Intstallation and Operation Guide 5-29