3xLOGIC VIGIL Server - Manual (Page 56)

8.2.2 MPEG4 CODEC Settings
To switch the recording CODEC to MPEG4, select the MPEG4 option from the CODEC drop-down menu.
Key-frame
Rates
Sets the number of key-frames recorded per second. The higher the value, the greater the data space needed for
recording, but the higher the quality of the video.
Motion
Search
Scope
Changes the size of the regions used to detect motion.
Quantization
Method
Selects the type of compression. H264 offers higher compression than MPEG4 but requires more CPU usage.
ME Accuracy
Motion Estimation Accuracy includes two options: Full Pixel and Half Pixel. Full Pixel checks for motion comparing
differences of full pixels. Half Pixel will check for motion using an interpolation method that detects finer move-
ments.
Note: Half Pixel is a CPU intensive setting.
ME Algo-
rithm
The Motion Estimation Algorithm changes the shape of the area used for motion detection and includes two
options: Full Search and Fast Search. Fast Search will save CPU time but Full Search is more accurate.
ME Vectors
Sets the number of vectors tested for motion from 1 to 4. The greater the number, the more CPU processing is
required.
8.2.3 Hardware CODEC Settings
Depending on the VIGIL Server model, it may use Hardware CODEC recording, which has slightly different customization options. For
some types of cards the CODEC used can be changed in the VIGIL Server Settings | Hardware Tab via the Hardware CODEC drop-
down box.
Variable Bit
Rate
The default setting of Variable Bit Rate allows the encoder to change its recording bit rate automatically as
required. This option offers the best combination of file size and visual quality.
Constant Bit
Rate
Changes a variable bit rate into a constant bit rate. A setting of Constant Bit Rate with a very high bit rate
selected will provide the maximum video quality settings, although this is at the expense of storage space.
Restrict Max-
imum Bit Rate
Sets a hard limit on the maximum quality that can be recorded. Use the slide bar to select the desired maximum
bit rate.
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