User's Manual

AXIS Q1602 Network Camera

Video and Audio

• Compression. The compress ion level affects the image quality, bandwidth and ﬁle size of saved images; the lower the

compression, the higher the image quality with higher bandwidth requirements and larger ﬁle sizes.

• Rotate im age. If required, the image can be rotated.

• Maximum frame rate. To avoid bandwidth problems, the frame rate allo wed to each viewer c a n be limited.

• Overlay settings.See

Overlay, on page 18

Click Save to apply the new settings.

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-frames and P-frame s. An I-fram e is a com ple te image w h e reas

P-frames only contain the differences from previous frames.

The GOV length is the number o f frames between two consecutive I-fram es. Increasing the GOV length may save considerably o n

bandwidth requirements in some cases, but may also have an adverse affect on image q uality.

The Axis product supports two H.264 proﬁles.TheMainproﬁle provides highe r com pre ss ion tha n the Base line pr oﬁle 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 mo re b andw idth for incre ased a ctivity in the image, and less for lower ima ge a ctivity. CB R a llow s you to set a

ﬁxed Target bit rate that consumes a predictable amount of bandwidth. As the bit rate wo uld usually need to increase for increased

image activity, but in this case cannot, frame rate and image qualityareaffectednegatively. Topartly compensate for this, it is

possible to prioritize either frame rate or image quality. Not setting a prior ity means that frame rate and image qua lity are equally

affected. You must save your setting s before t h ey can tak e effect.

The current bit rate can be set to appear as text overlay. To do this, select the Include text check box option under Overlay

Settings and enter the modiﬁer #b in the ﬁ el d.

MJPEG

Sometimes the image size is large due to low light or complex scenery. Adj

usting the m aximum frame size helps to control the

bandwidth and storag e 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 low light. Limiting the frame

size optimizes bandwidth and storage usag e, but

may give poor image quality. To prevent increased bandwidth and storage usage,

the m a xim um fram e size should be set to an optimal value.

Stream Proﬁles

Astreamproﬁle is a set of pre-conﬁgured stream settings i ncluding resolution, compression, fram e ra te and ove rla y settings .

Stream proﬁles can be used:

• When setting up recording using action rules, see

Events, on page 30

• When setting up a continuous recording, see

Continuous Recording, on page 33

• In the Live View page — select the stream proﬁle from the Stream proﬁle drop-down list.

Four pre-programmed stream proﬁles are available for quick set up. Each pre-programm e d proﬁle has a descriptive name, indicating

its purpose. If required, the pre-programmed stream proﬁles can be modiﬁ ed and new customized stream proﬁles can be created.

To create a new proﬁle or modify an existing proﬁle, g o to Setup > Video & Audio > Stream Proﬁles.

To select a defa u lt stream proﬁle for the Live View page, go to Setup > Live View Conﬁg.