Posts by A1RFORCE1

Quote from HiassofT

The fix in the testbuild is included in this PR: linux (RPi): update to 5.10.4 by HiassofT · Pull Request #4871 · LibreELEC/LibreELEC.tv · GitHub

The problem is that H264 hardware decoding consumes quite a lot of RAM bandwidth and that results in HDMI audio FIFO underrun as audio DMA gets delayed because RAM is busy.

The kernel patch included in the testbuild (and the PR) increases the memory bandwidth for audio DMA which helps a lot, but it looks like a bit more tweaking is needed.

Unfortunately neither kodi nor kernel log will show anything if or when that happened.

As a workaround you can also disable hardware decoding (in player->video settings), software-decoded H264 videos (which was the default in nighty builds until a few weeks ago) don't suffer from the audio dropout issue.

so long,

Hias

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nicely found !! thanxz, looking forward to the further tweaks !

I also noticed when DRM Prime decoding is enable the menu button overlay for the (normal) DVD menu's is not showing the highlight (but not with all dvd's)

I modified the DVDVideoCodecDRMPRIME.cpp for test (kodi 18.9 was just fine)

if (!(hints.codecOptions & CODEC_FORCE_SOFTWARE)){

while ((codec = av_codec_iterate(&i)))

{

if (!av_codec_is_decoder(codec))

continue;

if (codec->id != hints.codec)

continue;

const AVCodecHWConfig* config = FindHWConfig(codec);

if (config)

return codec;

}

} else {

if ( hints.codec == 2){

CLog::Log(LOGINFO, "CDVDVideoCodecDRMPRIME::{} return nullptr for codec {}",__FUNCTION__, hints.codec);

return nullptr;

Now the menu is showing normal again...

I can also post a debug log of a master hd audio track if needed ..

Hi Hias,

Yes this corrected the audio problem, SUPER!

The master HD track seems to run smootly again

True HD tracks have minor audio stutter

But what's the fix in this version so I can add this in the nightly builds

I will post a new debug log off the True HD movie ...

Quote from Klojum

We prefer to have full log files with debugging enabled.

Also kindly provide them via a pastebin service as to not clutter up our forum server. Thanks.

Ok no problem I will thirst reinstall latest nightly and enable debug..

Libreelec master compiled with kodi 19 b1 / a3 same issue

Is it still possible to download nightly versions from november so I can check at what point the audio gets broken?

TrueHD ( and master dtshd) Audio not working anymore with the latest nightly (Rpi4) builds. Or stutter since december builds

Fixed.

Used the nightly build 22-05 noobs (Index of /) (LibreELEC-RPi4.arm-9.80-nightly-20200522-76f70e9-noobs.tar)

replaced rpi4 folder in official noobs release (Download NOOBS for Raspberry Pi)

On command:

mount -o remount,rw /flash

changed dtoverlay to dtoverlay=vc4-kms-v3d-pi4 in /flash/distroconfig.txt

On libreelec interface:
Changed audio output device in libreelec system config to : ALSA: vc4-hdmi,MAI PCM vc4-hdmi-hifi-0 S/PDIF

enabled audio Passthrough for all

No freezing, no hdmi signal drop by the avr...

Hopefully Libreelec 10 will use this by design

Tested with the resolution 640 * 480p problem

still persists

second test with audio passthrough turned off (and 640 * 480) problem still remains.
maybe there is a difference in how the drivers actually address the gpu hardware

Will do, but it doesn’t look like a data rate problem to me. when i am just in the kodi main menu without playing anything and change the volume the hdmi also drops just presenting a main screen. that looks like pretty basic data 🧐. But if all fails i keep the extractor in mind 😀

Little update:

I tried the kodi nightly build, and switched the dtoverlay from vc4-fkms-3d to vc4-kms-3d-pi4 and the volume problem is solved. So problably the error is in the vc4-fkms-3d driver or it's missing some parameters for this setup to work.

Leaving the new pi4 kms driver is not an option at this moment, because the picture is constantly freezing . And I see a lot of alsa audio errors in the log. 1 problem solved, 1 new problem created

Just replaced all cables with HDMI 2.0b. The problem still persists .. Reinstalled the popcorn hour a-400 with the same setup which doesn't give any problems.

Also the flag hdmi_safe=1 doesn't work.

Is there an option to get the audio to the second hdmi output. So i can connect the PI4 directly to the tv on the first hdmi out and the audio to the receiver on the second hdmi out ?

Hi Da Flex,

The cable between my pi 4 and the receiver is 1.4. I just ordered a hdmi 2.0b cable. Hope it works , thanks !

Hi DA Flex, thanxz . I have tried this setup and it’s working ok. But now i don”t have the audio over my receiver, cause the pi4 does not have another audio out 😔. before the pi4 I had a popcorn hour a-400 connected on exactly the same way without any problems so I think somehow the pi4 reacts on the av receiver putting the volume level on the tv screen which i can’t turn off

Hi fellow members,

I have a question regarding my pi4 setup. My pi4 is connect to a sony av receiver which is connected to a LG tv. So far so good. But when i change the audio volume the hdmi signal is dropping for 10 seconds. This is not only happening during playback. Changing the volume in the libreelec menu is also dropping the signal. Is there any setting in the config.txt which will prevent this behaviour? Many thanks,, kind regards ,,

libreelec version 9.2.1