The developer, I was talking with, said, they currently switch from VC4 to HDMI codec (whatever this means). It's possible that PCM pass-through has a mapping issue due to that change.
Posts by Da Flex
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There is no option for channel mapping on LE.
FLAC, AAC and Vorbis can't be played with pass-through, so the switch makes no difference here. As a workaround, you could use PCM and pass-through.
Generally your issue seems to be a bug. You can try LE 9.95.4. If the bug remains, write a bug report.
It's still beta testing.

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Da Flex, 2.0 with FL and FR is output correctly.
My point is different. 2.0 output channels doesn't mean you're just getting FL and FR. Instead all other channels are encoded at those two. If everything works right, more than 2.0 output channels are mapped correctly to the hardware, but I'm not sure about this. So please test this setup and report.
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Thanks for testing. I have no clue about the update implementation. Anyway, I would try to rename the file for a test:
Final.Space.S03E11.1080p.WEBRip.x264-BAE.mkv
->
Final_Space_S03E11_1080p_WEBRip_x264_BAE.mkv
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Do you have tried 2.0 output channels at the audio settings?
Does enable / disable audio pass-through make any difference?
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Ah, now I get the idea, "demonstrate" was the keyword to me. If you make it, don't forget the German market.

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To my knowledge, LE 10 Beta can play audio on HDMI-1 now. In theory it's possible to get A/V on HDMI-1, too.
With LE 10 Beta video settings have been moved from config.txt to cmdline.txt. I'm not familiar with the new syntax. Maybe there is a setting to switch video to HDMI-1.

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In case you're thinking, OS and add-on's can be separated for a long time, you're wrong. As an example, current Widevine changes require OS changes to keep it working on ARM. All your byte-per-byte optimizations can be a waste of time then. Things change quick in nirvana world.
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You are wasting your time by adding limitations to LE. Storage space is cheap these days.
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Oh, so the Version 10 is not available for Pi 3?
Correct. Use a nightly build instead: Click!
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May I ask where to get the image file?
- Click Downloads on top of this forum page.
- Select your hardware.
- Select LibreELEC 10.0 Beta at the tab.
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There is no way to do that. The RPi has no ADC, and the Amp2 has no input.
Some HiFiBerry cards have audio input and mixing capabilities.
Those cards work on LE (you get multiple output device options, one for mixing).
If you're an electronic nerd, you can add an ADC for small bucks: Click!
This solution requires apt packages, which LE doesn't offers.
So better use "Raspberry Pi OS" and "Kodi" package for this.
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OK, then the 4GB of your RPi are good enough.
My next idea is that the scraper doesn't deliver the right format to be listed on LE's recently list.
Code2021-05-28 19:45:45.777 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 26 2021-05-28 19:45:45.777 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 31 2021-05-28 19:45:45.777 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 40 2021-05-28 19:45:45.777 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 68 2021-05-28 19:45:45.926 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 26 2021-05-28 19:45:45.926 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 31 2021-05-28 19:45:45.926 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 40 2021-05-28 19:45:45.926 T:1084 DEBUG <general>: DatabaseUtils::GetSortFieldList: unknown field 68Play around with different movie scrapers.
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In short a swap file expands RAM. Good luck!
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The first line should do it. Chances are your output device doesn't support YCbCr, and then it falls back to RGB.
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I haven't found obvious errors at your latest log, but it seems like a lot of images are cached into memory.
Maybe creating a swap file helps: Click!
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"please help" generally makes no sense, because that's what this forum is all about.