Axis P3367-VE Manuel d'utilisateur télécharger pdf (Page 17)

AXIS P3367–VE Fixed Dome Network Camera

Video and Audio

Image

You can modify the image resolution and compression, a nd rotate the image from the Image tab (Video & Audio > Video Stream).

Setting the compression level affects the image quality and bandwidth; the lower the compression, the higher the image quality

with higher bandwidth requirements.

To avoid bandwidth problem s on the network, you can limit the frame rate allowed to each viewer. The maximum frame ra te can be

set to Unlimited, or you can limit the frame rate to a value.

An image or text can be superimposed over the image as overlay. See Overlay, on page 20.

Save your settings before they can take effect.

H.264

H.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-fra mes, P-frames and B-frames. An I-frame is a complete image

whereas 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 saves considerably on

bandwidth but may have an adverse affect on image quality.

The Axis product supports two H.264 proﬁles.TheMainproﬁle provides higher compression than the Baseline proﬁle with the same

video quality, b ut requires more processing power to decode.

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

complexity, using up more bandwidth for increased activity in the image, and less for lower image activity. 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, frame rate and image quality are affected negatively. To partly compensate for this, it is

possible to prioritize either frame rate or image quality. Not setting a priority means that frame rate and image quality are equally

affected. 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 Includ

etextcheck box option under Overlay Settings

and enter the code #b in the ﬁeld.

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. Setting the frame size to the Default setting

provides consistently good image quality at the expense of increased bandwidth and storage usage in lo w light. Limiting the frame

size optimizes bandwidth and storage usage, but may give poor image quality. To prevent i ncreased bandwidth and storage usage,

the maximum frame size should be set to an opti

mal value.

Stream Proﬁles

There are four pre-programmed s tream proﬁles available for quick set up. The settings for these can be adjusted. New cus tomize d

proﬁles can also be created. Each proﬁle has a descriptive name, indicating its p urpose.

•Thestreamproﬁles can be accessed from the Stream proﬁle drop-down list in the Live View pag e.

• 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 Settings

The Video & Audio > Camera Settings page provides access to advanced image settings for the Axis product.

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Axis P3367-VE Manuel d'utilisateur Page 17

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