Performance Considerations - Axis Q1645 User Manual

AXIS Q16 Network Camera Series
Troubleshooting
Problems with streaming
Multicast H.264 only
accessible by local clients
No multicast H.264
displayed in the client
Poor rendering of H.264
images
Color saturation is different
in H.264 and Motion JPEG
Lower frame rate than
expected
Can't connect over port 8883 with MQTT over SSL
The firewall blocks traffic
using port 8883 as it's
deemed insecure.

Performance considerations

When setting up your system, it is important to consider how various settings and situations affect the performance. Some factors
affect the amount of bandwidth (the bitrate) required, others can affect the frame rate, and some affect both. If the load on the
CPU reaches its maximum, this also affects the frame rate.
The following factors are the most important to consider:
• High image resolution or lower compression levels result in images containing more data which in turn affects the
bandwidth.
• Rotating the image in the GUI can increase the product's CPU load.
• Access by large numbers of Motion JPEG or unicast H.264 clients affects the bandwidth.
• Simultaneous viewing of different streams (resolution, compression) by different clients affects both frame rate and
bandwidth.
Use identical streams wherever possible to maintain a high frame rate. Stream profiles can be used to ensure that
streams are identical.
• Accessing Motion JPEG and H.264 video streams simultaneously affects both frame rate and bandwidth.
• Heavy usage of event settings affects the product's CPU load which in turn affects the frame rate.
Check if your router supports multicasting, or if you need to configure the router settings between
the client and the device. You might need to increase the TTL (Time To Live) value.
Check with your network administrator that the multicast addresses used by the Axis device
are valid for your network.
Check with your network administrator to see if there is a firewall that prevents viewing.
Ensure that your graphics card uses the latest driver. You can usually download the latest drivers
from the manufacturer's website.
Modify the settings for your graphics adapter. Go to the adapter's documentation for more
information.
• See Performance considerations on page 64.
• Reduce the number of applications running on the client computer.
• Limit the number of simultaneous viewers.
• Check with the network administrator that there is enough bandwidth available.
• Lower the image resolution.
• Log in to the device's web interface and set a capture mode that prioritizes frame rate.
If you change the capture mode to prioritize frame rate it might lower the maximum
resolution, depending on the device used and capture modes available.
• The maximum frames per second is dependent on the utility frequency (60/50 Hz)
of the Axis device.
In some cases the server/broker might not provide a specific port for MQTT communication. It may
still be possible to use MQTT over a port normally used for HTTP/HTTPS traffic.
• If the server/broker supports WebSocket/WebSocket Secure (WS/WSS), typically on
port 443, use this protocol instead. Check with the server/broker provider to see if
WS/WSS is supported and which port and basepath to use.
• If the server/broker supports ALPN, the use of MQTT can be negotiated over an open
port, such as 443. Check with your server/broker provider to see if ALPN is supported
and which ALPN protocol and port to use.
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