Raspberry PI 4 video flickering about displaycameras HOT 9 CLOSED

Unfortunately I'm having this same issue as @jeffyl. Displaycameras can usually load a few streams before the flickering occurs. I was attempting to output to a 4k TV which at first I thought was the issue, but the issue occurs at 1080p also. Thanks Anonymousdog!

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Same issue here, 4 screens on medium @3160p is fine, 4 screens on high @3160p is super-seizure-madness.

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What are your all's gpu memory splits? Has anyone monitored video memory allocation during these tests?

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I have tried up to 768 gpu memory split, higher doesn't work. I read about memory split on the official pi forums and it seems to rather not matter on the 3b and later. I have not monitored the GPU memory usage, not even sure how.

from displaycameras.

I was experiencing the same issues as well on pi 4. 9 screens on low output to a 1080p TV.

I changed the gpu_mem to 1024 which seem to have solved the problem for me.

https://www.raspberrypi.org/documentation/configuration/config-txt/memory.md

Not sure if this is a fix for everyone but it worked for me.

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I am trying to configure a RPi4 with 4GB and a 4K TV that I recently purchased. I am having no luck so far. Just trying to use 2 1920x1080 camera feeds I could only get one to display when I had gpu_mem set to 512. It would switch back and forth (like a flicker, but only displaying one feed at a time) between both feeds until ultimately one would go blank and then the 2nd would display fine. As ahjcheng mentioned above I then tried setting gpu_mem=1024 and I was able to get 2 1080p feeds to display, however an attempt to display 4 of them would only display the original 2. I then tried a lower res substream of 704x480. With this resolution I can only get 7 of 9 to display when trying a 3x3 layout. I'm not sure if this is just poor support for 4k displays in the RPi4, an issue with my 4K TV, or what.

The documentation linked above states:
Values of gpu_mem over 512 are not recommended, will provide no performance improvements, and are untested.

Something did change when I set it to 1024, in that it would allow 2 1080p streams where when I set it to 512 it would flash back and forth between the 2. In the end, it is very inconsistent and I can't figure out any combination of settings that will allow me to display more than 2 streams at 1080p or more than 7 at D1 (704x480).

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I am not using HD feeds, actually. I am testing with 704x480 substreams and have reduced them to 10 FPS and the lowest bitrate of 256. Despite these changes I cannot display more than 8 feeds.

I am using BlueIris for DVR but I am pulling these RTSP substream feeds directly from the cameras over gigabit network on the same LAN as the cameras.

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