Ericsson AVP 1000 1RU, Справочное руководство, Страница: 339 / 508

Advanced Video Processing and Networking
EN/LZT 790 0023/1 R16A
6-19
6.8.1.6 Stripe Refresh (CE-x, CE-xA)
When the AVP/SWO/CE-x/STRIPE license is enabled, and the unit configured for
H.264 encoding, a Stripe Refresh buffer mode becomes available which can provide
an end to end latency of sub 100 ms when combined with the Ericsson RX8200.
This mode has a limited set of configurable parameters to ensure that minimum
latency is achieved. This, however does make this mode more suited to “talking
heads” content rather than action, fast moving or frequent scene changes.
When configured in Stripe Refresh buffer mode the bit rate range is limited as
follows:
•
4 Mbps to 10 Mbps in SD
•
8 Mbps to 40 Mbps in HD
Audio encoding is not supported in Stripe Refresh mode. Only LPCM Pass-through
or Dolby E Pass-through operation is supported.
6.8.1.7 Stripe Refresh (+ Audio Encode) (CE-x, CE-xA)
This mode adds support for MPEG-1 Layer II audio encode to Stripe Refresh. The
same license, configuration and bit rate limitations apply.
In order to support Audio Encode, the delay in this mode is increased from <100 ms
to <150 ms compared to the Stripe Refresh mode.
6.8.1.8 Fixed Latency
This mode is only supported on CE-x modules when configured for H.264 encode.
It provides a fixed encode latency of ~625ms across the supported bit rate range of
the selected H.264 video profile.
When configured for Fixed latency buffer mode the minimum supported bit rate is
1.5 Mbps for SD and 4Mbps for HD.
There are no limitations to the audio supported in this buffer mode.
6.8.2 Typical Delay Performance
The typical performance of each type of delay is shown in the tables below.
Note: The delay figures provided in the table assumes a GOP Structure set to IP,
Scene Cut Detection to Off for H.264, On for MPEG-2, and a HD 1080i
video format.