Axis Communications AXIS FD-R M12 user manual Axis 209FD/FD-R/FD-R M12 GOV Settings

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GOV Settings

The GOV structure describes the composition of the MPEG-4 video stream. Setting the GOV-length to a high value saves considerably on bandwidth. The Cyclic refresh parameter gives a smoother bit rate and can be useful if bandwidth is limited.

Bit Rate Control

Limiting the maximum bit rate is a good way of controlling the bandwidth used by the MPEG-4 video stream. Leaving the Maximum bit rate as unlimited will provide consistently good image quality, but at the expense of increased bandwidth usage whenever there is more activity in the image. Limiting the bit rate to a defined value will prevent excessive bandwidth usage, but images will be lost when the limit is exceeded.

Note that a maximum bit rate can be used for both variable and constant bit rates.

The bit rate type can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR will adjust the bit rate according to the images' complexity, thus using a lot of bandwidth for a lot of activity in the image and less for lower activity in the monitored area.

CBR allows you to set a fixed Target bit rate that will consume a predictable amount of bandwidth, and which will not change whatever happens in the image.

As the bit rate would usually need to increase for increased image activity, but in this case cannot, the frame rate and image quality will be affected negatively. To go some of the way towards compensating for this, it is possible to prioritize either the frame rate or the image quality whenever the bit rate would need to be increased. Not setting a priority means the frame rate and image quality will be affected more or less equally.

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Contents User’s Manual About this Document CanadaContents Product overview Key featuresDescription Overview Setup System Options LED settings LED IndicatorsColor Description Access from a browser Accessing the CameraAxis Media Control Accessing the camera from the Internet Setting the root passwordLive View Axis 209FD/FD-R/FD-R M12 How to stream MPEG-4 Video StreamsAlternative methods of accessing the video stream MPEG-4 clientsMotion Jpeg Axis Media Control AMCConfiguring the camera Accessing the Setup linkVideo & Image Text Overlay SettingsImage Overlay/Mask Settings Overlay/MaskVideo Stream Upload and use an overlay/maskAdvanced CameraLighting Conditions Low Light BehaviorAxis 209FD/FD-R/FD-R M12 GOV Settings Live View Config Default Video FormatDefault Viewer Viewer SettingsHtml Examples External VideoAction Buttons User Defined LinksSequence Mode Event Config Event ServersEvent Types Triggered EventsHow to set up a triggered event Click Add triggered on the Event typesPre-trigger and Post-trigger buffers Scheduled EventsCamera Tampering Axis 209 FD-R/FD-R M12 Motion Detection Object SizeTips System Options SecurityIP Address Filter ReferralsDate & Time Basic TCP/IP Settings IP Address ConfigurationNetwork Services Advanced TCP/IP SettingsHttp QoS Settings QoS Quality of serviceSmtp email LED Settings MaintenanceUPnP BonjourResetting to the factory default settings Unit connectorsUsing the Control Button SupportAxis 209FD/FD-R/FD-R M12 Troubleshooting Emergency recovery procedureChecking the firmware Upgrading the firmwareAxis Support Symptoms, Possible Causes and Remedial Actions Camera is accessible locally, but not externallyCamera is inaccessible BrowserBrowser freezes Poor quality snapshot imagesMotion Detection triggers unexpectedly Technical Specifications Specification ModelsSpecification Installation General performance considerations Optimizing your system BandwidthGlossary of Terms Etrax Ethernet Token Ring Axis Axis own microprocessorSee also IP Internet Protocol Megapixel See Pixel VOP See VOPSSL/TSL Secure Socket Layer/Transport Layer Security URL Uniform Resource Locator An address on the networkAxis 209FD/FD-R/FD-R M12 Index Snmp