Axis Q1604–E User Manual

Also see for Q1604-E: Datasheet User manual Datasheet Installation guide Installation guide

AXIS Q1604–E Network CameraVideo and AudioSetting the compression level affects the image quality and bandwidth; the lower the compression, the higher the image qualitywith higher bandwidth requirements.To avoid bandwidth problems on the network, you can limit the frame rate allowed to each viewer. The maximum frame rate can beset to Unlimited, or you can limit the frame rate to a value.An image or text can be superimposed over the image as overlay. SeeOverlay, on page 23.Save your settings before they can take effect.H.264H.264, also known as MPEG-4 Part 10/AVC, is a video compression standard that provides high quality video streams at low bit rates.An H.264 video stream consists of different types of frames such as I-frames, P-frames and B-frames. An I-frame is a complete imagewhereas P-frames and B-frames only contain the differences from previous/future frames.The GOV length is the number of frames between two consecutive I-frames. Increasing the GOV length may save considerably onbandwidth requirements in some cases, but may also have an adverse affect on image quality.The Axis product supports two H.264 profiles. The Main profile provides higher compression than the Baseline profile with the samevideo quality, but requires more processing power to decode.The bit rate can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the imagecomplexity, using up more bandwidth for increased activity in the image, and less for lower image activity. CBR allows you to set afixed Target bit rate that consumes a predictable amount of bandwidth. As the bit rate would usually need to increase for increasedimage activity, but in this case cannot, frame rate and image quality are affected negatively. To partly compensate for this, it ispossible to prioritize either frame rate or image quality. Not setting a priority means that frame rate and image quality are equallyaffected. You must save your settings before they can take effect.The current bit rate can be set to appear as text overlay. To do this, select the Include text check box option under OverlaySettings and enter the modifier#b in the field.MJPEGSometimes the image size is large due to low light or complex scenery. Adjusting the maximum frame size helps to control thebandwidth and storage used by the Motion JPEG video stream in these situations. Setting the frame size to the Default settingprovides consistently good image quality at the expense of increased bandwidth and storage usage in low light. Limiting the framesize 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 ProfilesThere are four pre-programmed stream profiles available for quick set up. The settings for these can be adjusted. New customizedprofiles can also be created. Each profile has a descriptive name, indicating its purpose.• The stream profiles can be accessed from the Stream profile drop-down list in the Live View page.• To add, copy, modify, and remove stream profiles go to Video & Audio > Stream Profiles.• To select the default stream profile go to Live View Config > Stream Profile and choose the profile from the drop-down list.For more information see the online help on this page.Camera SettingsThe Video & Audio > Camera Settings page provides access to advanced image settings for the Axis product.20