Axis Q7406 Video Encoder Blade User Manual download pdf (Page 12)

AXIS Q7406 - Video settings

Bit Rate Control

Limiting the maximum bit rate helps control the bandwidth used by the H.264 video stream. Leaving the Maximum bit rate as

unlimited maintains consistently good image quality but increases bandwidth usage when there is more activity in the image.

Limiting the bit rate to a defined value prevents excessive bandwidth usage, but images are lost when the limit is exceeded.

Note that the maximum bit rate can be used for both va

riable and constant bit rates.

The bit rate can be set as Va

riable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image

complexity, using up bandwidth for increased activity in the image, and less for lower activity in the monitored area.

CBR allows you to set a fixed Target bit rate th

at consumes a predictable amount of bandwidth. As the bit rate would usually

need to increase for increased image activity, but in this case cannot, the frame rate and image quality are affected

negatively. To partly compensate for this, it is possible to prioritize either the frame rate or the image quality whenever the bit

rate needs to be increased. Not setting a priority means the frame rate and image quality are equally affected.

Note:

determine a reasonable bit rate, go to Setup > Video > Video Stream > Image, check the Include checkbox and enter

the code #b in the Include text: field. The current bit rate will display as a text overlay on the Live View page.

To view the image stream while configuring the GOV

settings and Bit rate control, select Open... under Preview.

MJPEG

Sometimes the image size is large due to low light or complex scenery. Adjusting the maximum frame size helps to control the

bandwidth and storage used by the Motion JPEG video stream in these situations. Defining the frame size as Unlimited

provides consistently good image quality at the expense of increased bandwidth and storage usage during low light. Limiting

the frame size optimizes bandwidth and storage usage, but may give poor image quality. To prevent increased bandwidth and

storage usage, the maximum frame size should be set to an optimal value.

Stream Profiles

There are 4 pre-programmed stream profiles available for quick set-up. These settings can be adjusted and new customized

profiles can be created. Each profile has a descriptive name, describing its usage and/or purpose. The profiles can be accessed

from the Live View page.

• To add a new stream profile, click Add to bring up the Stream Profile Settings panel.

• Choose a descriptive name a

nd enter a description for your profile.

• Choose the form of Video enco

ding you wish to use from the drop-down list:

H.264 - Also known as MPEG-4 Part 10. This is t

he new generation compression standard for digital video. This function

offers higher video resolution than Motion JPEG or MPEG-4 at the same bit rate and bandwidth, or the same quality

video at a lower bit rate.

Motion JPEG - Delivers a high quality video stream, from which individual

images can be extracted and saved.

• Copy an existing stream profile to your system and rename the copy

• Modify an existing stream profile based on the light situation and motion to be captured by your video encoder. See

Stream Profile Settings for more information.

• Highlight the stream profile you wish to remove, then click Re

move to remove it from the list.

Camera Settings

This page provides access to the advanced image settings for the AXIS Q7406.

Image Appearance

Color level - Select an appropriate level by entering a value in the range 0-100. Lower values mean less color saturation,

whilst the value 100 gives maximum color saturation.

Brightness - The image brightness can be adjusted in the range 0-100, where a higher

value produces a brighter image.

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Axis Q7406 Video Encoder Blade User Manual Page 12

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