PTP Master and Members
The SV-4K DMP is capable to serve as a PTP master or as a PTP member, where
members obtain their time from the master. The PTP master, in turn, will get its time
from an NTP server.
By default, all SV-4K devices are designated as eligible master candidates.
DMP-to-DMP Content Synchronization
The DMP-to-DMP Content Synchronization feature for the SV-4K media player
synchronizes content rendering of playlist items on the displays.
This synchronization includes transitioning from one item to the next (such as for still
images), and more accurate playback and rendering of local video content. For local
video, this serves as the foundation for implementing video ribbon boards and video
walls. This requires cabling of a single SV-4K media player per display.
NOTE:
Widgets, external URLs, and multicast video tuning
synchronization are outside the scope of this feature.
Improved content synchronization was first introduced in Cisco StadiumVision Director
Release 3.2 on the DMP 4310G through the use of the Network Time Protocol (NTP).
Cisco StadiumVision Director Release 4.0 supports enhanced content synchronization
methods for the SV-4K only, with close synchronization of playlist item transition using
the Precision Time Protocol (PTP).
Zone-Based Video Wall Synchronization
Zone-based video wall synchronization is an alternative form of synchronization
available for SV-4K devices participating in a video wall.
The primary benefit of this form of synchronization is that if any SV-4K device that is not
the leader in the video wall reboots, it will "catch up" to play whatever content item that
the rest of the video wall is currently playing. This form of synchronization is
recommended for dedicated video walls that are running video content longer than 15
minutes.
If an SV-4K device reboots in a video wall that is
not
using zone-based video wall
synchronization (using normal DMP-to-DMP synchronization), the tradeoff is that the
rebooting SV-4K synchronizes with the rest of the video wall at the next content item in
the playlist, or at replay of a single-item playlist.
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