User Manual

AXIS P3384–V

Video and Audio

• Resolution. Select the default resolution.

• Compression. The compression 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 image. If required, the image can be rotated.

• Mirror. If required, the image can b e mirrored.

• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each viewer can be limited.

• Overlay settings.SeeOverlay on page 19.

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-frames. An I-frame is a complete image wh e reas

P-frames only contain the differences from previous frames.

The GOV length is the number of frames between two consecutive I-frames. Increasing the GOV length may save considerably on

bandwidth requirements in some cases, but may also have an adve rse affect on imag e quality.

The Axis product supports two H.264 proﬁles.TheMainproﬁle provid es higher compre ssion t han the Ba seline proﬁle with the same

video quality, but 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 ima ge , 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 i s

possible to prioritize either frame rate or image quality. Not setting a priorit

y 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 Include text check box option under Overlay

Settings and enter the modiﬁer #b in the ﬁeld.

MJPEG

Sometimes the ima ge 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 Motio n 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 storag

e 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

Astreamproﬁle is a set of pre-conﬁgured stream settings including resolution, compression, frame rate and overlay settings.

Stream proﬁles can be used:

• When setting up recording using action rules, see Events on page 32.

• When setting up a continuous recording, see Continuous Recording on page 36.

• 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 s et up. Each pre-programmed proﬁle has a desc riptive nam e, indicating

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

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

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