Underpowering would definitely be an issue for any led and any color. With 4 channel pixels and the option of white colors, regardless of your psu the wrong white selection will always seem off specifically when an opposing color temp is displayed.
This can be slightly negated by tuning white and adding small ammounts of rgb until you get the desired color but keep in mind this can lead to fairly large power draw increases.
if loop out doesn't work then it's an HDCP issue. You'd need something to strip HDCP like a cheap DA or an HDMI splitter with RCA breakouts.
The most important question is which varient of the (W) did you get? I have NW for natural white and I feel my white is spot on, it also helped a ton to have NW when calibrating the other colors especially yellow and aqua.
If you have WW (warm white) itll be more yellowy/orange and CW (cool white) itll be more blueish.
It would be nice to have monitors for CPU/GPU/Mem utilization and temp from within the web UI.
Also would be nice to have network config expised from the web UI to be able to static the pi.
The sensors would be really helpful for troubleshooting. For instance my post on sk6812 was most likely a GPU/Mem utilization issue with the Rpi3 whereas the Rpi4 has plenty and the issue was rectified by switching. I know it can be done via SSH but having it readily and easily available in the UI would be very nice.
I had a Pi 4 laying around and decided to try it from that unit. It has more horsepower so I clocked it higher and this is what I've got and its perfectly stable not a single flicker since the change
LED Output:
Baudrate 3600000
Only copied the fields I edited.
cmdline.txt:
spidev.bufsiz=65536
config.txt:
#uncomment to overclock the arm. 700 MHz is the default.
over_voltage=2
arm_freq=1750
# GPU Overclocking
core_freq=650
core_freq_min=650
# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Enable audio (loads snd_bcm2835)
dtparam=audio=off
I have a Pi3B running 2.0.14
Pixels: SK6812 GRB (NW)
Pixel count: 262, 84 top and bottom and 47 sides
Pixels and Pi are running off a 350w meanwell dialed in to 5.1v(5v at lights after vdrop).
Magewell HDMI plus capture card and HDMI DA running off the Pi usb power.
The cable going from the pi to the lights isn't super short so I added a logic level shifter.
In the past I had been using ws2811 and the flickering was cured by adding the level shifter.
Ground and 3.3 from the pi pins to the LV side of the level shifter. The HV side of the level shifter comes directly off the PSU.
I have modified the cmdline.txt
spidev.bufsize=1024000
I have modified the config.txt
dtparam=audio=off
There is a sporadic flicker and the first pixel frequently stuck on green or sometimes off and occasionally stuck on a random color but this is much less frequent..
