I have another issue as well:
Norwegian censorship stops DNS resolving of opensubtitles.org
kodi's SOCKS5 with DNS is not supported by PriveteInternetAccess (aka PIA) that I use. (not the DNS part)
nor does PIA support RPi .. their (rather nice) Linux client is great on Ubuntu - so that could indicate that I really should just use a weak (not-noisy) SFF computer or something like that for the job.
Please open a new thread for this question.
I close this one to make it not too messy.
If you go DAC -> RPi -> DAC, then the RPi will become a bottle neck, because incoming DAC data have to go to RPi's bus controller, and then back to GPIO. I belief that the GPIO itself is another bottle neck, because probably the same pins will be used for input / output.
Even if such a pass-through-over-RPi function exists, it has to be managed by the HiFiBerry driver, not by LE. Again: Ask the HiFiBerry support to get the definite answer. They are friendly and firm. On a regular PC you would be right, and you would get the desired routing options, but an RPi is different.
Original post is here. That's why I close this copy bot thread.
I think I understand your setup now. You want a pass-through function inside the HiFiBerry DAC. This is not part of LE's audio.
Those DAC's are made for RPi -> DAC and DAC -> RPi, but not DAC -> DAC. Ask the HiFiBerry support to be sure (they are pretty good).
I suggest to use something like this instead (and hope for low latency).
Yes, reducing video quality to increase audio quality points to a weak data bus. That's why your above RPi sound card will not do the trick.
If you search for best audio compatibility (Dolby Atmos etc.), and price doesn't matters, then have a look at the Nvidia Shield TV. It's probably the best streaming box (also available as "pro" version).
If you want to stay with LE, an Intel NUC will provide better performance. I don't have this, so other users should verify AAC / H265 compatibility before you buy.
OK, looks like AAC codec is the problem. Another user made an interesting point: He changed the HDMI mode to make it work - click.
PS: I just mean that HDMI 5.1 / 2.1 / 2.0 audio is no official standard.
Next things you can try:
1) disable buffering (<buffermode>3</buffermode>)
2) test latest nightly builds (maybe it's already fixed)
3) if 1) and 2) fails, provide a link to a complete log file
I have my RPi plugged into a switched AVR outlet. It's rude but has been working great for some months.
Too rude, because instant power-off without shutdown procedure can destroy your file system.
Maybe you don't know it, because this is your first RPi. The RPi doesn't shutdown completely. If you want a complete shutdown (zero power consume on the board), you have to use additional hardware.
A benefit of the incomplete shutdown is the option to power-on by GPIO button press. You can buy RPi 4B cases with power buttons, or make your own.
I assume you want to connect an RS232 interface to the serial GPIO pins of an RPi. To get the Python GPIO library, all you have to do is to install the "Raspberry Pi Tools" add-on. Start your Python script with this lines to import that add-on lib:
#!/usr/bin/python
import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
import RPi.GPIO as GPIOThis is hard to answer, because so much data is missing on your description. 
What exactly do you want to do?
What's your hardware (RPi version, HifiBerry version)?
Which input / output ports do you want to use?
Do you want to use a MIDI device connected to the RPi?
If the answer to last question is yes, then LE is not the right OS for you. Instead you'll need a real-time (RT) kernel OS (like Patchbox OS). That will provide low latency MIDI processing.
Read about advancedsettings.xml, chapter 2.8.5 cache -> buffermode. Switch off the buffer (mode 3) just to see whether it has effect.
Chapter 2.2.2 video -> latency could be the better option for you (proper video latency timing hopefully produces in-sync A/V).
Let it run over night, and hopefully the scraper did his magic on the next day. 
If I manually refresh a particular video the poster comes up but with over 700 movies it's a bit cumbersome.
Maybe it just takes time until everything has been updated automatically.
Thanks. Please try this advancedsettings.xml:
<advancedsettings>
<samba>
<statfiles>false</statfiles>
</samba>
<cache>
<buffermode>4</buffermode>
</cache>
</advancedsettings>Which LE hardware do you use? How do you access your movies (local storage, SMB...)?