Both cameras are connected via a Netgear Giabit Switch (Prosafe GS105)
connected to a NUC i5 processor. I'm constrained to cylindrical housing to
protect the cameras from water. So, I don't have a ton of real estate.
The cameras are in there own separate housing from the main computer and
connected to it via a cable that rated for gigabit Ethernet.
I have noticed as well one camera per port and things work great. Just saw
Charl's post about the Prosafe switch, maybe that's the culprit.
On Thu, Nov 16, 2017 at 11:26 AM, Nils Hasler <hasler@xxxxxxxxxxxxxx> wrote:
how are you connecting the cameras to the PC?
In my experience achievable bandwidth depends a lot on the employed
network equipment. Some cheap network cards cause a lot of trouble when
connecting multiple cameras to one card.
In my experience using a 10-gigabit card combined with a PoE switch works
well or one network card per camera. I like Adlink GIE64+ for the latter.
On 16 November 2017 at 18:06 Ian McCoy <immccoy78@xxxxxxxxx> wrote:There
I believe there is a significant performance issue with the way aravissrc
is handling the processing of Gigabit packets when there is more than one
camera streaming images simultaneously. I think this is preventing the
cameras/network from operating well below their maximum capability.
have been a few posts in the past that mentioned this and it alwaysfrom
dismissed as as bandwidth issue. But, I don't believe that's the case.
Our team has two applications. The first uses 6 USB BlackFly Cameras
Point Grey for a spherical cameras system. The cameras are configured asfrom
follows: 1920x1200, Grey8, and at 10Hz. We are able to use some fairly
elaborate pipelines (encoding h.264, using a compositor, outputting
compositor image on network) with hardly any issues. Video is smooth and
video displays well when viewed locally on computer.
As a comparison, the second application uses two Blackfly Gigabit camera
from Point Grey. The cameras are configured as follows: 1920x1200, Grey8
and at 5Hz. This application is operating well within the bandwidth
requirements for gigabit network/camera system and I'm seeing ~70+ packet
resends errors per second spread between the two cameras. Most packet
resends are requesting more than one Ethernet packet which I think is
causing significant performance issue when how the video is encoded and
displayed locally. I used wireshark to get the capture and confirm the
In both scenarios, the same processor is being used. Also, both
applications the cameras are being simultaneously externally trigger.
I also ran some other scenarios where I reduced the image size (600x480)
kept the same frame rate. This scenario worked great, but as I recall
memory I saw only using a few Megabytes of bandwidth on network.
If you got any suggestions, I would appreciate it.
Dr. Nils Hasler
+49 174 175 66 42
The Captury GmbH, Saarbruecken, Germany
Amtsgericht Saarbrücken, HRB 101327
Executive Director: Nils Hasler