Comnet CNVETX1 Datasheet Page 51
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INS_CNVETX1_REV– 06/10/13 PAGE 51
INSTALLATION AND OPERATION MANUAL CNVETX1
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VBR files vary the amount of output data per time segment. VBR allows a higher bit rate (and
therefore more storage space) to be allocated to the more complex segments of media files while
less space is allocated to less complex segments. The average of these rates can be calculated to
produce an average bit rate for the file.
The advantages of VBR are that it produces a better quality-to-space ratio compared to a CBR file
of the same size. The disadvantages are that it may take more time to encode, as the process is
more complex, and that some hardware might not be compatible with VBR files.
In Constant Q mode only Q Initial is entered. This mode is intended to keep a constant quality.
A low Q setting will generally have a high bit rate providing high quality. A high Q setting will
generally have a low bit rate with lower quality.
Each mode has its own relevant parameters. Other parameters are shaded.
Bit rate
The Bit rate parameter is the bit rate of the stream. The Bit rate can be set to a value in the range
of 50000 to 10000000. The default value is 4000000.
The rate control mode determines the required parameters:
» Average Bit rate: Average bit rate of the video stream (VBR mode only).
» Maximum Bit rate: Maximum bit rate of the video stream (VBR mode only).
» Constant Bit rate: The bit rate of the video stream (CBR mode only).
Quantization
The Q (Quantization) parameters are quality settings, where 8 is lowest quantization and highest
quality (and more bits used), and 30 is the highest quantization and lowest quality (and less bits
used).
The rate control mode determines the required parameter.
» QInitial: Quantization value used in the first encoded frame. In Constant Q mode this value
shall remain fixed for all frames.
The figures below show the CBR, VBR, and Constant Q modes of the MPEG-4 encoder.
- VIDEO ENCODER/DECODER UNIT 1
- About This Guide 2
- About ComNet 3
- Contents 4
- Contents, continued 5
- Overview 6
- Abbreviations List 7
- Introduction 9
- Software Features 10
- Hardware Overview 12
- Label Description 13
- ANALYTICS Analytics Engine On 13
- PWR Power (DSP Running) 13
- Connecting the Cables 15
- Getting Started 18
- Figure 8: General Sub Menus 19
- Figure 9: The About Page 20
- Resets user password 22
- Changing system password 22
- Returns to factory defaults 22
- Changing Web Language 22
- Figure 10: Enter Password 24
- Monitoring Live Video 25
- Alarms and Contact Closures 26
- Closures 27
- 3. Select Set Relay 27
- Figure 14: PTZ Commands Page 28
- Figure 17: Connection Type 30
- Figure 20: Select Bit Count 31
- Figure 21: Select Stop Bits 32
- Figure 22: Select Parity 32
- Figure 23: PTZ Commands 33
- Table 7: PTZ Movement Control 34
- Panning a PTZ Camera 35
- Figure 27: PTZ Camera at 40° 36
- Figure 28: Speed Settings 36
- Figure 29: Zoom Area 38
- Figure 30: Focus Area 38
- Figure 31: Iris Area 38
- Zooming the Camera 39
- Focusing the Camera 41
- Symbol Description 42
- GoTo preset location 42
- Define preset 42
- Delete preset 42
- Figure 38: Pattern Area 43
- Table 11: Pattern Symbols 43
- Audio/Video Configuration 44
- 4. Select Save 48
- Figure 44: OSD Parameters 49
- Table 5 – UTC Time Zones 53
- Figure 54: MJPEG Settings 61
- Figure 56: QuickTime Window 63
- Figure 57: Insert URL 63
- Figure 59: No Active Streams 64
- Figure 65: Video Settings 67
- Figure 67: Audio Settings 71
- 3. Select Save 72
- Managing System Settings 73
- Figure 72: Serial Port Modes 75
- Network Settings 78
- Changing the IP Address 81
- Figure 78: System Reset 82
- Changing the User Password 84
- Setting up the Clock 85
- Configuring the SNMP Settings 87
- Configuring Operation Mode 89
- Updating the Firmware 90
- System Administration 91
- Resetting the User Password 92
- 2. Select Save 93
- Reset to Factory Defaults 94
- Change Web Interface Language 97
- Configuring Local Storage 99
- Media Files 100
- SD Maintenance 101
- Decoding Video 102
- Video Type 103
- TECH SUPPORT: 1.888.678.9427 104
- Figure 98: MPEG-2 CODEC 105
- Figure 99: MPEG-4 CODEC 106
- Figure 100: H.264 CODEC 107
- Figure 101: MJPEG CODEC 108
- Figure 103: Audio Settings 110
- Display Configuration 111
- 7. Select OK 114
- Figure 113: URL Input Dialog 116
- RTSP URI Format 117
- General Video Parameters 118
- MJPEG Parameter 118
- MPEG-2 Parameters 118
- MPEG-4 Parameters 119
- H.264 Parameters 119
- General Audio Parameters 120
- PCMA and PCMU Parameters 120
- Multicast Parameters 120
- ComNet Customer Service 122
- Contact Information 122
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