Cisco DMS-DMP-4300G User Manual

14-2
User Guide for Cisco Digital Media Player Device Manager 5.2.x
OL-15764-03
Chapter 14 Configure Video and Audio Settings
Concepts
Understand Presentation Time Stamp (PTS) Values
Some of the metadata inside MPEG-2 files and streams is meant to ensure that:
• Video and audio data are synchronized correctly during playback.
• Playback occurs at the correct speed.
The metadata element that controls these behaviors is called the p
resentation time stamp, or PTS. The
original encoding of an MPEG-2 file automatically adds PTS metadata values to it. These values state
when a video or audio frame must be presented to the client system, relative to the timing of nearby
frames. So, in a typical MPEG-2 transport stream:
• Each video frame travels with one PTS value that describes it uniquely.
• Several audio frames travel together with one PTS value that describes them collectively.
Understand System Time Clock (STC) Values
When your DMP receives an MPEG-2 transport stream, it inspects the packets to find and make use of
PTS values within them. The first time that your DMP finds a PTS value in a transport stream, it
generates a system time clock (STC) value for its own use. Then, multiple events occur in tandem.
• Approximately 24 milliseconds after your DMP recognizes that the multicast stream has delivered
a PTS value, its generated STC value triggers playback of the corresponding video and audio data.
This brief delay contributes to proper playback of the stream.
• Your DMP considers the video frame rate and other factors to make programatic assumptions about
what the second PTS value will say and when it should arrive. Based on these assumptions, it
generates a second STC value. Your DMP repeats this process each subsequent time that it finds a
PTS value. It only ever discards a generated STC value when it learns that one of its assumptions
was wrong.
Understand Why PTS-STC Discrepencies Flood the Buffer and Cause Latency
If anything delays a PTS value from arriving when the corresponding STC value anticipates that it should
arrive, the visible result is latency during playback. This occurs because the jitter buffer must hold more
data than it is intended to hold.
Many factors might affect how “late” a PTS value can be, including network congestion, CPU load on
th
e DMP, and how the originating encoder is configured. For example, how does the encoder interleave
audio with video, and does it use B frames?
The arrival time for any PTS value can never be guaranteed, even in the best networks.
Guidelines
• Limit and Reduce Latency, page 14-2
Limit and Reduce Latency
You can reduce the risk of latency and limit its effects. Simply configure the originating encoder to:
• Use I frames and P frames only. It should not use B frames.
• Minimize the interleave time for audio and video.

Cisco DMS-DMP-4300G Specifications

General

Model	DMS-DMP-4300G
Category	Media Player
Video Output	HDMI
Ethernet	10/100/1000 Mbps
Wireless	802.11 a/b/g/n
Internal Storage	8 GB
External Storage	USB
USB Ports	2
Audio Output	HDMI
Network Connectivity	Ethernet
Supported Formats	JPEG, MPEG-1, MPEG-2, MPEG-4, H.264
Power Supply	12V DC

Summary

Health and Safety Overview

General Precautions

Essential guidelines to prevent accidents and ensure safe operation of the equipment.

Protect Against Electrostatic Discharge

Steps to prevent damage to sensitive components from static electricity.

DMP Specifications

Physical Interfaces (I/O Ports)

Describes the connectors, sensors, and buttons available on each DMP model.

Welcome

DMPDM

Introduces DMPDM as a lightweight webserver for DMP management.

Centrally Manage Digital Signage Services

Describes Cisco Digital Signs for managing local, regional, or global DMP networks.

Centrally Manage IPTV Services

Explains Cisco Cast for delivering video-on-demand and live broadcast TV channels.

Centrally Manage Sports and Entertainment Venue Services

Introduces Cisco StadiumVision for IPTV content management in venues.

Connect to a Power Source

Receive Electrical Power from a 100V–240V AC Socket

Step-by-step guide to connect the DMP to a standard AC power outlet.

Receive Electrical Power from 802.3af Power over Ethernet (PoE)

Instructions for powering the DMP using Power over Ethernet (PoE).

Connect to a Network

Connect Over Ethernet

Step-by-step instructions for connecting the DMP via an Ethernet cable.

Connect Over Wireless (802.11 b/g)

Instructions for establishing a wireless network connection for the DMP.

Connect to a Presentation System

Use an HDMI Connection

Step-by-step guide for connecting the DMP to a display using an HDMI cable.

Use a Connection that Combines HDMI with DVI

Connect to a Touchscreen

Details how to connect the DMP to a touchscreen display for interactive use.

Connect to an Analog Display or Projector

Log in to DMPDM

Log in

Step-by-step instructions for logging into the DMPDM administrative interface.

Start Here

DMPDM Workflow

Describes the typical workflow for testing and committing settings in DMPDM.

Save Configured Settings

Instructions on how to save configuration changes made in DMPDM.

Restart Your DMP

Steps to restart the DMP for applying changes or troubleshooting.

Configure NTP Settings for Time-Dependent Features, As Needed

Restore Factory Default Settings

Instructions on how to reset the DMP to its factory default configuration.

Investigate Which DMP Firmware Updates Are Available

Upgrade (or Downgrade) DMP Firmware

Steps to install new or older firmware versions on the DMP.

DMP Access and Security Settings

Understand DMP User Accounts and Passwords

Explains the Web Account and Service Account for DMPDM access.

Protect Your DMP from Unauthorized Management

Steps to secure the DMP and prevent unauthorized access.

Manage and Edit Passwords

Instructions for changing Web Account and Service Account passwords.

Enable or Disable Types of Access to Your DMP

How to control different types of administrative access to the DMP.

Enable or Disable Centralized Management

Configure Settings for Touchscreens, Projectors, and Displays

Choose and Calibrate a Touchscreen Driver

Steps to select and calibrate drivers for touchscreen devices.

Configure Video Output

How to configure the DMP's video output settings for displays.

Adjust DMP Display Attributes

Configure Network Settings

Workflow to Define Wi-Fi Settings

Configure HTTP Proxy Server Settings for a DMP 4310G

Configure a Wireless Network Connection

Step-by-step instructions for setting up a wireless network connection for the DMP.

Prepare Your DMP to Use a Static IP Address Over Ethernet

Guide for configuring a DMP with a static IP address for deployment without DHCP.

Browser Settings (‘TVzilla’)

Understand Content Substitution (‘Failover’)

Adjust TVzilla Settings

How to modify TVzilla browser settings for specific situations.

Adjust Whether TVzilla is Transparent, Translucent, or Opaque

Specify Which URL to Load in TVZilla

Instructions for setting the default URL for the TVzilla browser.

Configure Video and Audio Settings

Performance Factors

Understand Jitter

Understand the Jitter Buffer

Understand Why PTS-STC Discrepencies Flood the Buffer and Cause Latency

Limit and Reduce Latency

Adjust Jitter Buffer Control (Advanced Multicast) Settings

How to control audio/video synchronization in multicast streams.

Play Media

Play Assets from a USB Flash Drive

Watch or Stop Video from a UDP Multicast Stream

Watch or Stop Video from an HTTP URL

Watch or Stop Video from a File Stored on Your DMP