62 TruVision DVR 40 User Manual
5. To change the camera resolution
You can select one of four video resolutions. A high image resolution requires that a high bit rate
must also be selected. QCIF is the lowest resolution value and 4CIF the highest. If you change this
option, you must reboot the TVR 40 to implement the change.
Go to the Resolution list box and select one of the options listed: QCIF, CIF (default), 2CIF, and 4CIF.
6. To select the frame rate
You can select between several different frame rates. A low bit rate can be selected when the
frame rate is low.
Go to the Record Rate/fps list box. Use the arrow buttons to select one of the options listed: Full
(PAL is 25 FPS and NTSC is 30FPS), 20, 16, 12, 10, 8, 6 (default), 4, 2, 1, 1/2, 1/4, 1/8, 1/16.
7. To select the maximum bit rate
See Table 11 for the recommended bit rate ranges by resolution option. The actual
maximum bit
rate must be calculated from your camera, background, and image quality requirements.
Table 11: Bit rate by resolution
Resolution Default bit rate Recording speed
4CIF 896 Kbps 8 fps
2CIF 896 Kbps 12 fps
CIF 1.0 Mbps Real time
QCIF 256 Kbps Real time
Go to the Max Bit Rate list box and select one of the options listed (bps):
32K, 48K, 64K, 80K, 96K, 128K, 160K, 192K, 224K, 256K, 320K (default), 384K, 448K, 512K, 640K,
768K, 896K, 1M, 1.25M, 1.5M, 1.75M, 2M, and “User defined“.
8. Select OK to confirm changes and return to the Recording menu.
9. When you have made all the changes required in the Recording menu, go to OK and press Enter
or left-click the mouse to save all changes and return to the main menu.
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