Flicker at dusk and dawn

[astrocusanus]

Hi!
I recently got my all sky cam online (astrocusanus.org) and have flicker issues. As recommended I shifted the histogram box away from the centre and resized it and could solve the problem partially. However, especially at dusk and at dawn I still have flickering. What puzzles me most is that during flickering the exposure times I see in the frames seems to have nothing to do with the actual brightness displayed. So I just would like to ask someone to give a look at my log file and confirm that I do not have a hardware issue or a bad configuration.
Thanks a lot!
Christof

gitloghead.txt
allsky_flicker.txt
config.txt

[EricClaeys]

@astrocusanus Christof, in order to provide better debugging information would you please update to the latest software via the instructions Here ? Then follow the instructions at the Wiki page on Reporting Issues. That will set the Debug Level higher to provide more info.

Some ZWO cameras behave in this strange way where increasing the exposure a few times doesn't change the brightness and then all of a sudden the brightness jumps way too high, and decreasing the exposure time doesn't do anything until all of a sudden it goes way down, and the cycle repeats.

It may be related to the camera not getting enough power, possibly due to a long or poor quality power cord to the Pi, or a power supply not providing enough power to the Pi. If you have a powered USB 3 hub you can try that. Or a more powerful power supply for the Pi.

[astrocusanus]

Hi Eric, thank you for your quick reply.
The second chapter sounds familiar. That could be the reason.
I will update the software - did that about a month ago - and see if that helps.
Best wishes
Christof

[EricClaeys]

@astrocusanus Christof, what is the "second chapter"? The second paragraph? Or something else?

[astrocusanus]

Did I write chapter. I meant paragraph of course … Sorry for that. I did not yet find the time to update the software however, I find the following lines in the log which could be the source of the trouble: * cannot create regular file '//image.jpg': Permission denied * Any idea about that? Best regards Christof

…

Am 30.05.2022 um 04:24 schrieb EricClaeys ***@***.***>: @astrocusanus <https://github.com/astrocusanus> Christof, what is the "second chapter"? The second paragraph? Or something else? — Reply to this email directly, view it on GitHub <#1242 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AZMOQ4WFUKL6HZ4YQ72FTMDVMQRHRANCNFSM5XIRYYOQ>. You are receiving this because you were mentioned.

[EricClaeys]

@astrocusanus Christof, I also noticed those and tried to determine where they came from. Please set Debug Level to 4 in the WebUI, then:

sudo systemctl stop allsky
sudo truncate -s 0 /var/log/allsky.log
sudo systemctl start allsky

Let it go until you see that error (you can run tail -f /var/log/allsky.log to look for it), then upload the log file.

This isn't related to the flickering issue. This is happening after the picture is taken and it's trying to copy it somewhere - probably to the website.

[astrocusanus]

Hi Eric,
yesterday I updated the Pi and also the allsky software as you suggested however, the flicker is still there. The exposure times shown seem to have nothing to do with the brightness of the frames. I attach the new files (with debug mode level 4) and hope you can find any clue to solve the problem.
Thank you in advance
Christof
allsky.txt
config.txt
gitloghead.txt