User`s manual

AXIS Q7404 - Video & Audio settings

must also be checked to enable sound in the product. See Audio Support (Channel 1), on page 34.

Current Audio Settings:

The configuration defined under Video & Audio > Audio Settings is shown here. See Audio Settings (Channel 1), on page 15.

H.264

GOV Settings

The GOV structure describes the composition of the video stream and setting the GOV-length to a higher value saves

considerably on bandwidth.

Bit Rate Control

The bit rate can be set as Variable bit rate (VBR) or Constant bit rate (CBR). VBR adjusts the bit rate according to the image

complexity, using more 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 that 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:

To determine a reasonable bit rate, go to Setup > Video & Audio > Video Stream > Image. Under Text Overlay

Settings, check the Include text checkbox and enter the code #b in the field. The current bit rate will display as a text

overlay on the Live View page.

To preview 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. The settings can be adjusted and/or 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.

Go to Setup > Video & Audio > Stream Profiles to set up and configure stream profiles.

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

1. Enter a unique name and a description for your profile.

2. Select a Video encoding (H.264 or MJPEG) from the drop-down list.

3. Change the stream settings under the Image, Audio, H.264 and MJPEG tabs. See Video Stream, on page 12.

4. Click OK to save the profile.

• To copy an existing stream profile, click Copy and enter a new name. Change the stream profile settings as above.

• To modify an existing stream profile, click Modify and change the settings as above. For pre-programmed profiles, the

original settings can always be restored by clicking the Restore button.

• To remove a stream profile, select the profile and click Remove. Pre-programmed profiles cannot be removed.