Filter
Top Products
17
AXIS 213 PTZ
Advanced - MPEG-4
Client Compatability
The AXIS 213 PTZ supports the following different MPEG-4 profiles and levels:
Advanced Simple Profile @ Level 3 Max bit rate = 768 kbit/s, ISMA compliant
Advanced Simple Profile @ Level 5 Max Bit rate = 8 Mbit/s
To use Advanced Simple Profile @ Level 3, select ISMA compliant and click the Save button.
Level 5 is preferred if there is enough bandwidth available, as the image quality of the video stream will be
better than at level 3. The viewing client must support the profile used for the video stream, otherwise the
MPEG-4 stream cannot be viewed.
Note: The Axis Media Control supports all the configuration possibilities described on this page.
GOV Settings
The GOV structure can be set to either I or IP, which describes the type of images included in the video
stream, as well as their internal order. The IP-structure generally sends the differences compared to the
previous image and far fewer complete images, so this method uses much less bandwidth than the
I-structure. The I-structure gives higher frame rates when using a high resolution, but requires more
bandwidth.
The GOV length determines the sum total of P-images and I-images in a GOV. Setting the GOV length to a
high value saves considerably on bandwidth. However there may be noticeable decay in the image at high
values.
Notes: •GOV = Group of VOPs
•VOP = Video Object Plane
•Video Object Plane = image
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 bandwith 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.
Profile@Level Properties