User Manual
Table Of Contents
- Chapter 1 Product introduction
- Chapter 2 Installation
- Chapter 3 Getting started
- Chapter 4 Operating instructions
- Chapter 5 Live view
- Chapter 6 Controlling a PTZ camera
- Chapter 7 Playing back a recording
- Overview of the playback window
- Playback pop-up menu
- Instant playback
- All-day playback
- Searching recorded video
- Playing back recordings by time and video type
- Playing back recordings by event
- Creating and playing back bookmarked recordings
- Slideshow of snapshots
- Playing back recordings from the system log
- Playing back frame-by-frame
- Digital zoom in playback
- Chapter 8 Archiving recorded files
- Chapter 9 Using the web browser
- Windows Vista and 7 users
- Accessing the web browser
- Web browser overview
- Using the web browser to configure the device
- Searching and playing back recorded video
- Searching for event logs
- Dual streaming
- Controlling a PTZ dome camera in the web browser
- Capturing text insertions
- Text overlay
- Using a network storage system
- Chapter 10 Recording
- Chapter 11 Alarm settings
- Chapter 12 Network settings
- Configuring general network settings
- Configuring an NTP server
- Configuring e-mail
- Configuring SNMP
- Configuring the FTP server
- Configuring a remote alarm host
- Configuring multicast
- Configuring the server and HTTP ports
- Configuring the RTSP service port
- Checking network status
- Exporting network packet data
- Port forwarding
- Chapter 13 HDD management
- Chapter 14 Camera settings
- Chapter 15 NVR management
- Chapter 16 User management
- Appendix A Specifications
- Appendix B PTZ protocols
- Appendix C Port forwarding information
- Appendix D KTD-405 keypad
- Appendix E Maximum pre-recording times
- Appendix F Supported PTZ commands
- Appendix G Default menu settings
- Glossary
- Index
TruVision NVR 21 User Manual 145
Appendix E
Maximum pre-recording
times
The maximum pre-recording time that can be selected depends on the bit rate.
Frame rate, resolution and image quality do not impact time.
Note: This information only applies when the bit rate is set to Constant (see
“Initializing recording settings” on page 81 for more information).
Constant bit rate
Maximum pre-recording time
(seconds)
32 30
48 30
64 30
80 30
96 30
128 30
160 30
192 30
224 30
256 30
320 30
384 30
448 30
512 30
640 30
768 30
896 30
1024 30
1280 25
1536 20