By default, Kodi on LibreELEC running on Raspberry Pi 4 was detecting our Optoma ZK 507 projector and setting the output resolution to 4096x2160 @ 30 Hz. This was all right, but our 3840x2160 and 1920x1080 shows were showing a black bar at the bottom. Checking for solutions - not the minimise black bars global setting, but instead, setting the resolution from the comments on this thread,
https://discourse.osmc.tv/t/howto-guide-to-the-kodi-whitelist-function-and-related-settings/83919
I did not need to make a whitelist or blacklist in Kodi (blacklist is for devices, whitelist is for allowed video modes) - just setting the resolution at Settings --> System --> Display to 3180x2160 @ 30 Hz did the trick. Now, no black bars at the bottom of the FHD or UHD videos.
Another issue was, hiss in the sound output via a generic USB sound output, when amplified by our sound system. We set up a limiter and a gate with our old Behringer MDX 2200 compressor. Then, for further sweetening, I got a second-hand Lexicon Alpha sound device via bajaao.com for approximately one day's salary, and used that for sound output - no more hiss.
For recognizing the Lexicon Alpha, we had to plug it in after the Raspberry Pi booted into LibreELEC and Kodi - on every reboot. After recognizing the device, a one-time configuration change in Kodi --> Settings --> Audio settings --> Audio device , and set the output device to Lexicon Analog (not Lexicon SPDIF in this case).
Trying a direct connection for the Lexicon Alpha onto the RPi (as against a connection via a USB hub) also did not resolve the issue of not recognizing it on boot. So, we're plugging it in after every reboot (on the USB hub for convenience.)
Also available -
https://kodi.wiki/view/Settings/System/Audio#Maintain_original_volume_on_downmix
(not directly useful for us, since we're not downmixing all our files)
https://kodi.wiki/view/Settings/System/Audio#Volume_control_steps
(set it to the maximum of 50)
And, compression also seems to be available, via specific video's context menu
https://forum.kodi.tv/showthread.php?tid=196313
https://kodi.wiki/index.php?title=Video_playback#Audio_Settings
If this could be a global setting, we could perhaps avoid the hardware compressor, too.
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