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Spectra BlueScale Vision 956YH60001 User Manual

Spectra camera user guide
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Spectra BlueScale Vision
Camera User Guide

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  Summary of Contents for Spectra BlueScale Vision 956YH60001

  • Page 1 Spectra BlueScale Vision Camera User Guide...
  • Page 2 P/N: 956YH60001 Copyright © 2007. All Rights Reserved. Document Version: 1.0 All trademarks and trade names are the properties of their respective owners.
  • Page 3: Table Of Contents

    CHAPTER 1 INTRODUCTION ... 1 Overview ... 1 Physical Details - Network Camera ... 3 Package Contents ... 4 CHAPTER 2 BASIC SETUP ... 5 System Requirements ... 5 Installation - Network Camera ... 5 Setup using the Windows Wizard ... 6 CHAPTER 3 VIEWING LIVE VIDEO ...
  • Page 4 CHAPTER 6 WINDOWS MONITOR/PLAYBACK/IP RECORDER UTILITY ... 53 Overview ... 53 Installation ... 53 System Tray Icon ... 54 Main Screen ... 54 Camera Setup ... 55 Main Screen ... 58 Recording Video ... 60 CHAPTER 7 TROUBLESHOOTING ... 64 Overview ...
  • Page 5: Chapter 1 Introduction

    Chapter 1 Introduction This Chapter provides details of the Network Camera's features, components and capabilities. Overview The Network Camera has an Integrated Microcomputer and a high quality CMOS digital-Image-Sensor, enabling it to display high quality live streaming video over your wired LAN, the Internet, and for the Network Camera, an 802.11g Wireless LAN. Using enhanced MPEG-4 technologies, the Network Camera is able to stream high quality video and audio directly to your PC.
  • Page 6: Internet Features

    • Viewing/Recording Utility. A user-friendly Windows utility is provided for viewing live video. For periods when you are absent, or for scheduled recording, this application also allows you to record video to an ASF file on your PC. The recorded files are in a standard Windows Media format, and thus usable by a wide variety of programs if required.
  • Page 7: Physical Details - Network Camera

    Physical Details - Network Camera Front - Network Camera Lens No physical adjustment is required or possible for the lens, but you should ensure that the lens cover remain clean. The image quality is degraded if the lens cover is dirty or smudged. Microphone The built-in microphone is mounted on the front.
  • Page 8: Package Contents

    Package Contents The following items should be included: If any of these items are damaged or missing, please contact your dealer immediately. 1. Network Camera 2. Antenna (Wireless Model Only) 3. Power adapter 4. Installation CD-ROM 5. Quick Installation Guide...
  • Page 9: Chapter 2 Basic Setup

    Chapter 2 Basic Setup This Chapter provides details of installing and configuring the Network Camera. System Requirements • To use the wired LAN interface, a standard 10/100BaseT hub or switch and network cable is required. • To use the Wireless interface, other Wireless devices must be compliant with the IEEE802.11b or IEEE802.11g specifications. All Wireless stations must use compatible settings.
  • Page 10: Setup Using The Windows Wizard

    4. Check the LEDs • The Power LED will turn on briefly, then start blinking. It will blink during startup, which takes 15 to 20 seconds. After startup is completed, the Power LED should remain ON. • The Network LED should be ON. For more information, refer to Physical Details - Network Camera in Chapter 1.
  • Page 11 2. The next screen, shown below, will list all the Network Cameras on your LAN. • Select the desired Camera from the list on the left. The current settings for the selected Camera will be displayed in the table on the right. •...
  • Page 12 4. This screen allows you to enter a suitable Description, and set the correct Time Zone, Date, and Time. Make any desired changes, then click Next to continue. 5. On the following IP Address Settings screen, shown below, choose Fixed IP Address or Dynamic IP Address. •...
  • Page 13 6. If you chose Fixed IP Address, the following TCP/IP Settings screen will be displayed. • Enter an unused IP Address from within the address range used on your LAN. • The Subnet Mask and Default Gateway fields must match the values used by PCs on your LAN. •...
  • Page 14 8. Click OK to confirm that you want to save the new settings. If you want to cancel your changes, click Cancel. 9. After clicking OK, you will see the screen below. Clicking the Install Utility button will install the Viewing/Recording utility described in Chapter 6 - Windows Viewing/Recording Utility.
  • Page 15: Chapter 3 Viewing Live Video

    Chapter 3 Viewing Live Video This Chapter provides basic information about viewing live video. Overview After finishing setup via the Windows-based Wizard, all LAN users can view live video using Internet Explorer on Windows. This Chapter has details of viewing live video using Internet Explorer. But many other powerful features and options are available: •...
  • Page 16 4. When you connect, the following screen will be displayed. 5. Click View Video. 6. If the Administrator has restricted access to known users, you will then be prompted for a username and password. Enter the name and password assigned to you by the Network Camera administrator. 7.
  • Page 17: Connecting To A Camera Via The Internet

    Connecting to a Camera via the Internet You can NOT connect to a camera via the Internet unless the camera Administrator has configured both the camera and the Internet Gateway/Router used by the camera. See Making Video available from the Internet in Chapter 4 - Advanced Viewing Setup for details of the required configuration. Also, you need a broadband Internet connection to view video effectively.
  • Page 18: Viewing Live Video

    6. If the Administrator has restricted access to known users, you will then be prompted for a username and password. Enter the name and password assigned to you by the Network Camera administrator. 7. The first time you connect to the camera, you will be prompted to install an ActiveX component (OCX or CAB file), as in the example below.
  • Page 19: General Options

    General Options These options are always available, regardless of the type of camera you are connected to. Camera Patrol. Move through the Preset positions in the sequence defined by the Camera Administrator. Camera Auto Pan. Click this to have the camera moved from left to right automatically.
  • Page 20: Chapter 4 Advanced Viewing Setup

    Chapter 4 Advanced Viewing Setup This Chapter provides information about the optional settings and features for viewing video via the Network Camera. This Chapter is for the Camera Administrator only. Introduction This chapter describes some additional settings and options for viewing live Video: •...
  • Page 21 3. Make the required adjustments, as explained below, and save your changes. MPEG-4 Settings Resolution Select the desired video resolution format. The default resolution is set to 320*240. • Constant Bit Rate: Select the desired bit rate. The default is set to 1.2 Mbps. Video Quality •...
  • Page 22: Controlling User Access To The Video Stream

    Controlling User Access to the Video Stream By default, anyone can connect to the Network Camera and view live Video at any time. If desired, you can limit access to scheduled times, and also restrict access to known users. To Control User Access to Live Video: 1.
  • Page 23: Making Video Available From The Internet

    Making Video available from the Internet If your LAN is connected to the Internet, typically by a Broadband Gateway/Router and Broadband modem, you can make the Network Camera available via the Internet. You will need to configure your Router or Gateway to allow connections from the Internet to the camera.
  • Page 24: Network Camera Setup

    Network Camera Setup The Network Camera configuration does NOT have be changed, unless: • You wish to change the port number from the default value (1024). • You wish to use the DDNS (Dynamic DNS) feature of the Network Camera. HTTP Port Configuration Normally, HTTP (Web) connections use port 80.
  • Page 25: Viewing Live Video Via The Internet

    2. Enter and save the correct DDNS settings on the DDNS screen of the Network Camera. 3. Operation is then automatic: • The Network Camera will automatically contact the DDNS server whenever it detects that the Internet IP address has changed, and inform the DDNS server of the new IP address.
  • Page 26 Viewing Live Video with the Viewing/Recording Utility If using the Windows Viewing/Recording Utility, the details of the Network Camera must be entered on the Camera Setup screen. Figure 21: Add Camera from Internet See Chapter 6 - Windows Monitor/Playback/IP Recorder Utility for full details on using the Windows Viewing/Recording utility.
  • Page 27: Motion Detection Alerts

    Motion Detection Alerts The Motion Detection feature can generate an Alert when motion is detected. The Network Camera will compare consecutive frames to detect changes caused by the movement of large objects. But the motion detector can also be triggered by: •...
  • Page 28 5. Select the E-Mail screen to have alerts sent by E-mail: • Enable and enter at least one (1) E-mail address • Select or enter the desired options for Video Attachment, Show "From" as and Subject fields. • Enter details of the SMTP Server used to send the E-mail. If the Motion Detection feature is enabled, but E-Mail is not enabled, then the only action when motion is detected is to log this event in the system log.
  • Page 29: Chapter 5 Web-Based Management

    Chapter 5 Web-based Management This Chapter provides Setup details of the Network Camera’s Web-based Interface. This Chapter is for the Camera Administrator only. Introduction The Network Camera can be configured using your Web Browser. The Network Camera must have an IP address which is compatible with your PC.
  • Page 30: Welcome Screen

    Welcome Screen When you connect, the following screen will be displayed. The menu options available from this screen are: • View Video - View live Video using your Web Browser. See Chapter 3 - Viewing Live Video for details. • Administration - Access the Administration menu.
  • Page 31: Administration Menu

    Administration Menu Clicking on Administration on the menu provides access to all the settings for the Network Camera. The Administration menu contains the following options: Setup • System • Network • Wireless (Wireless Model Only) • DDNS Video & Audio •...
  • Page 32: System Screen

    System Screen After clicking Administration on the main menu, or selecting System on the Administration menu, you will see a screen like the example below. Data - System Screen System Settings This displays the name for the Network Camera. Device ID Camera Name Enter the desired name for the Network Camera.
  • Page 33: Network Screen

    Choose the Time Zone for your location from the drop-down list. Time Zone If your location is currently using Daylight Saving, enable the Adjust for daylight saving checkbox. You must UNCHECK this checkbox when Daylight Saving finishes. Network Time Enable or disable the Time Server feature as required. Protocol If Enabled, the Network Camera will contact a Network Time Server at regular intervals and update its internal timer.
  • Page 34 Data - Network Screen Network Obtain an IP If selected, the Network Camera will obtain its IP address and related information from a DHCP Server. Address Only select this option if your LAN has a DHCP Server. Automatically Use the following IP If selected, you must assign the following data to the Network Camera.
  • Page 35: Wireless Screen (Wireless Model Only)

    Wireless Screen (Wireless Model Only) This screen is displayed when the Wireless menu option is clicked. Data - Wireless Screen Wireless Network WSC PIN Code It displays the WSC PIN code number for the camera. Network Type This determines the type of wireless communication used by the Network Camera. •...
  • Page 36 Security Security System Select the desired option, and then enter the settings for the selected method: • Disabled - No security is used. Anyone using the correct SSID can connect to your network. • WEP - The 802.11b standard. Data is encrypted before transmission, but the encryption system is not very strong.
  • Page 37: Ddns Screen

    DDNS Screen Many Internet connections use a "Dynamic IP address", where the Internet IP address is allocated whenever the Internet connection is established. This means that other Internet users don't know the IP address, so can't establish a connection. DDNS is designed to solve this problem, as follows: •...
  • Page 38 Data - DDNS Screen DDNS Enable DDNS Enable or disable the DDNS function, as required. Only enable this feature if you have registered for the DDNS Service with a DDNS Server provider. Service Provider Choose a service provider from the list. Web Site Button Click this button to open a new window and connect to the Web site for the selected DDNS service provider.
  • Page 39: Video & Audio Screen

    Video & Audio Screen This screen is displayed when the Video & Audio option is clicked. Figure 28: Video & Audio Screen...
  • Page 40 Data - Video & Audion Screen MPEG-4 Settings Resolution Select the desired video resolution format. The default resolution is set to 320*240. • Constant Bit Rate: Select the desired bit rate. The default is set to 1.2 Mbps. Video Quality •...
  • Page 41: Video Access Screen

    Video Access Screen This screen is displayed when the Video Access option on the Video & Audio menu is clicked. Figure 29: Video Access Screen...
  • Page 42 Data - Video Access Screen User Access • If disabled - No login required, users do not have to provide a username and password when they Enable Security connect to the camera to view video. Checking • If enabled - Require login, users will be prompted for a username and password when they connect to the camera to view video.
  • Page 43: User Database Screen

    User Database Screen This screen is displayed when the User Database option on the Video & Audio menu is clicked. Data - User Database Screen Existing Users This displays all users you have entered into the User database. If you have not entered any users, this list User List will be empty.
  • Page 44: Pan/Tilt Screen

    Pan/Tilt Screen This screen is displayed when the Pan/Tilt option on the Video & Audio menu is clicked. Data - Pan/Tilt Screen Pan/Tilt Enable Pan/Tilt Enable the checkbox in order to use the Pan/Tilt function. Control Preset Point Click this button to define the preset point position. Position Set Patrol Sequence Set Patrol Sequence...
  • Page 45 Set Preset Position Screen This screen is displayed when the Preset Point Positions button on the Pan/Tilt screen is clicked. Data - Preset Point Positions Calibration Click this button to reset the calibration of Pan/Tilt area. Preset List Select the desired Preset. The screen will update with the current data for the selected Preset Position. Preset Name Enter a suitable name for the Preset Position.
  • Page 46: Motion Detection Screen

    Motion Detection Screen This screen is displayed when the Motion Detection option on the Event menu is clicked. Data - Motion Detection Screen Motion Detection You can set the full screen or areas of the video image to be examined. Set Detection Areas Note: Motion detection can be triggered by rapid changes in lighting condition, as well as by moving objects.
  • Page 47: E-Mail Screen

    E-Mail Screen This screen is displayed when the E-Mail option on the Event menu is clicked. Data - E-Mail Screen Primary/Secondary SMTP Server SMTP Server Enter the address of the SMTP (Simple Mail Transport Protocol) Server to be used to send E-Mail. Address Authentication Select the desired Authentication type for the SMTP Server.
  • Page 48: Ftp Screen

    FTP Screen This screen is displayed when the FTP option on the Event menu is clicked. Data - FTP Screen Primary/Secondary FTP FTP Server Enter the address of the FTP Server. Port Enter the Port of the FTP Server to be connected. Enter your login name for the FTP Server.
  • Page 49: Http Screen

    HTTP Screen This screen is displayed when the HTTP option on the Event menu is clicked. Data - HTTP Screen HTTP Notification Enable Enable this checkbox to use the HTTP Notification. Enter the URL of your HTTP notification server. Proxy Server Specify the proxy server name in the provided field if the camera needs to pass through a Proxy Server to do Name the HTTP notification.
  • Page 50: Event Trigger Screen

    Event Trigger Screen This screen is displayed when the Event Trigger option on the Event menu is clicked. Data - Event Trigger Screen Event Schedule Schedule List The Event Schedule shows all of the event types currently configured in the Network Camera, along with various information about their configuration, as listed below: •...
  • Page 51 Trigger Event Motion Detection If enabled, movement in a motion detection window can be used to trigger events. This option is only available if your camera is fitted with a Pan/Tilt control. If available, select the desired Pan/Tilt Configuration option to resolve conflict between the Pan/Tilt and Motion Detection features. Interval Select the desired option for the events interval.
  • Page 52: Maintenance Screen

    Maintenance Screen Data - Maintenance Screen Administrator Login Enter the name for the Administrator here. Administrator Spaces, punctuation, and special characters must NOT be used in the name. Administrator The password for the Administrator. Password Verify Password Re-enter the password for the Administrator, to ensure it is correct. Firmware Upgrade Click the "Browse"...
  • Page 53 Backup & Restore Backup Click Backup button to save the current configuration information to a text file. Configuration File Restore Click Restore button to reinitialize the camera to load the new updated software. Do this after loading the Configuration upgrade file. File Clear File Name This does NOT stop the Restore process if it has started.
  • Page 54: Status Screen

    Status Screen Data - Status Screen System Device Name This shows the name of the Network Camera. Description This shows the description of the Network Camera, such as location. The version of the current firmware installed. F/W version Network MAC Address The current IP address of the Network Camera.
  • Page 55 Wireless (Wireless Model Only) WSC PIN Dode It displays the current WSC PIN code. This shows the Network Type currently in use (Ad-hoc or Infrastructure). Network Type This displays the wireless SSID. SSID Channel This shows the wireless channel currently used. Security The current security setting for Wireless connections.
  • Page 56: Log Screen

    Log Screen This screen displays a log of system activity. Data - Log Screen System Log This is a log of system activity. Enable Syslog Check the box to enable the System Log Server feature. Service Syslog Server Enter the address of the Syslog Server. Address Refresh Click this to update the data shown on screen.
  • Page 57: Chapter 6 Windows Monitor/Playback/Ip Recorder Utility

    Chapter 6 Windows Monitor/Playback/IP Recorder Utility This Chapter describes how to view and record the live video stream generated by the Network Camera, using the supplied Windows utility. Overview The recommended method to view video is to use the supplied Windows Viewing/Recording utility. This utility also allows you to record the video streams, either interactively or using a schedule.
  • Page 58: System Tray Icon

    System Tray Icon When started, the program will create an icon in the Windows system tray on the taskbar, as shown below. Figure 42: System Tray Icon You can right click the icon and it will provides a menu which allows you to view program details, view the main screen, or terminate the program.
  • Page 59: Camera Setup

    Camera Setup To define a camera and associate it with a Channel Number. 1. Click the Setup button on the main screen. You will see a screen like the example below. 2. Select the desired Channel number in the left (No.) column. 3.
  • Page 60 Camera Data - LAN Local ID This is the name you gave to this camera. This field must be entered. Camera Name This is the default name for the Network Camera, and cannot be changed. IP Address The current IP address of the Network Camera. Port Number This will normally display "80".
  • Page 61: Adding Cameras On The Internet

    Adding Cameras on the Internet If the Network Camera you wish to add is not on your LAN, but is available via the Internet, click the Internet button. You will see a screen like the example below. To associate a camera with the current Channel: 1.
  • Page 62: Main Screen

    Select the desired video stream type. There might be either MPEG4 or Motion-JPG streaming type. Stream Type Setup Camera Click this button to connect the Web-based interface of the Camera Pages Check this if you want the Camera to have the feature enabled. Enable Trigger Event You can add the same Camera twice, once for the LAN, and...
  • Page 63 Move Control. Use this to move the camera to the desired position. There may a short delay after clicking the desired icon. You should wait a couple of seconds rather than click again. Channel Indicator. This indicates the current channel (camera). Play.
  • Page 64: Recording Video

    Recording Video You can record Video while watching, or schedule recordings to occur when you are absent. Recordings are stored in a standard Microsoft ASF file format, and can be played using Microsoft Media Player. Before doing any recording, you should review the recording settings to ensure they are suitable for your PC. Recording Schedule To set the Recording Preferences, click the Recording Schedule tab on the Setup screen.
  • Page 65 Preferences This screen is displayed after clicking the Preferences tab on the Setup screen. If necessary, change these settings to suit your environment. Data - Preferences Recording Paths This is the Drive and Folder on your PC where recorded files will be placed. You need a drive which has Recording large amounts (Gigabytes) of free space.
  • Page 66 Disk Allocation for Each Camera Recording Total Disk Space This displays the total size of the disk selected for storing recordings. This displays the available space of the disk selected for storing recordings. Available Disk Space Enable Disk space Enable this if you wish to limit the disk space used by video recordings. limitation Enter the maximum amount of disk space which can be used for video recordings.
  • Page 67: Using Playback

    Using Playback To access the saved files of the Camera, click Playback button in the Main screen, then you will see the following screen. Figure 48: Playback Screen Searching Recorded Video Files Select Camera. Select the desired camera from the list. Recording Methods.
  • Page 68: Chapter 7 Troubleshooting

    Chapter 7 Troubleshooting This chapter covers the most likely problems and their solutions. Overview This chapter covers some common problems that may be encountered while using the Network Camera and some possible solutions to them. If you follow the suggested steps and the Network Camera still does not function properly, contact your dealer for further advice.
  • Page 69 Problem 4 I can't connect to the Network Camera using a Wireless connection. 1) If a LAN cable is connected to the LAN port, the Wireless interface is Solution 4 disabled. Only one interface can be active. 2) Check that your PC and the Network Camera have compatible Wireless settings.
  • Page 70: Appendix A Specifications

    Appendix A Specifications Network Camera Model Network Camera Dimensions 90mm (W) * 35mm (H) * 90mm (D) Operating Temperature 0° C to 40° C Storage Temperature 0° C to 40° C Network Protocols TCP/IP, DHCP, SMTP, NTP, HTTP, FTP, RTP, RTSP, UPnP (Discovery/Traversal) Network Interface 1 Ethernet 10/100BaseT (RJ45) LAN connection Wireless interface...
  • Page 71: Regulatory Approvals

    Regulatory Approvals FCC Statement This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
  • Page 72: Copyright Notice

    Copyright Notice Many software components are covered by the GNU GPL (General Public License). Some are covered by other Licenses as listed in the table below. Details of each applicable license are contained in the following section. No Warranty THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS '' AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  • Page 73 thttpd.c - tiny/turbo/throttling HTTP server Copyright ?1995,1998,1999,2000,2001 by Jef Poskanzer <jef@mail.acme.com > All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2.
  • Page 74 Libupnp-1.2.1 License Copyright (c) 2000 Intel Corporation. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2.
  • Page 75: Gnu General Public License

    GNU General Public License GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it.
  • Page 76 You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change.
  • Page 77 restrictions on the recipients' exercise of the rights granted herein.You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License.
  • Page 78: Gnu Lesser General Public License

    Lesser GNU General Public License GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999 Copyright (C) 1991, 1999 Free Software Foundation, Inc. 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. [This is the first released version of the Lesser GPL.
  • Page 79 free library does the same job as widely used non-free libraries. In this case, there is little to gain by limiting the free library to free software only, so we use the Lesser General Public License. In other cases, permission to use a particular library in non-free programs enables a greater number of people to use a large body of free software.
  • Page 80 (For example, a function in a library to compute square roots has a purpose that is entirely well-defined independent of the application. Therefore, Subsection 2d requires that any application-supplied function or table used by this function must be optional: if the application does not supply it, the square root function must still compute square roots.) These requirements apply to the modified work as a whole.
  • Page 81 who changes the contents of definitions files in the Library will not necessarily be able to recompile the application to use the modified definitions.) b) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (1) uses at run time a copy of the library already present on the user's computer system, rather than copying library functions into the executable, and (2) will operate properly with a modified version of the library, if the user installs one, as long as the modified version is interface-compatible with the version that the work was made with.
  • Page 82 in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 12.
  • Page 83: Appendix B Streaming Video/Audio Solution

    Appendix B Streaming Video/Audio Solution Overview Streaming video is a sequence of "moving images" that are sent in compressed form over the Internet and displayed by the viewer as they arrive. With streaming, a Web user does not have to wait to download a large file before seeing the video or hearing the sound. Instead, the media is sent in a continuous stream and is played as it arrives.

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