CHAPTER
14-1
User Guide for Cisco Digital Media Player Device Manager 5.2.x
OL-15764-03
14
Configure Video and Audio Settings
Revised: November 24, 2010
• Concepts, page 14-1
• Procedures, page 14-3
• Reference, page 14-6
Concepts
• Performance Factors, page 14-1
• Guidelines, page 14-2
• Workflows, page 14-3
Performance Factors
• Understand Jitter, page 14-1
• Understand the Jitter Buffer, page 14-1
• Understand Presentation Time Stamp (PTS) Values, page 14-2
• Understand System Time Clock (STC) Values, page 14-2
• Understand Why PTS-STC Discrepencies Flood the Buffer and Cause Latency, page 14-2
Understand Jitter
Differing amounts of transmission delay might affect any two packets in a multicast stream. Jitter
compares the transmission delays for two packets and measures the scope of difference between them.
Understand the Jitter Buffer
Each DMP reserves 5 MB in its RAM to buffer incoming packets from multicast streams. This method
is meant to reduce the risk of jitter during playback. The jitter buffer capacity of DMPs is sufficient to
store from an MPEG-2 transport stream:
• 8 seconds of SD video, encoded to 5 Mbps
• 2.2 seconds of HD video, encoded to 18 Mbps
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