Nightly builds Rpi4 Audio passthrough TrueHD/Master HD not working (huge stutter) anymore

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

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?

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..

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 ...

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

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...

Hi Hiassoft,

Just played a couple of true HD audio movies !! This fix seems to decrease the number off glitches

update:

- Hmmm after +/- 16 min of movie again a little stutter but a lot less..

- during the stutter the following entry appears in the logfile:

- after 25 min off movie the frequency of stutter increases

- restarted pi with debug log

- resumed the movie at 25 min

- now stutter begins after +/- 30 min .

2021-01-06 21:46:18.619 T:973 ERROR <general>: CAESinkALSA - snd_pcm_writei(-32) Broken pipe - trying to recover

2021-01-06 21:46:33.776 T:973 ERROR <general>: CAESinkALSA - snd_pcm_writei(-32) Broken pipe - trying to recover

2021-01-06 21:46:48.763 T:973 ERROR <general>: CAESinkALSA - snd_pcm_writei(-32) Broken pipe - trying to recover

2021-01-06 21:47:18.044 T:973 ERROR <general>: CAESinkALSA - snd_pcm_writei(-32) Broken pipe - trying to recover

2021-01-06 22:22:00.867 T:1079 DEBUG <general>: CDVDClock::ErrorAdjust - CVideoPlayerAudio::OutputPacket - error:-10068.390007, adjusted:-10068.390007

2021-01-06 22:23:21.364 T:1079 DEBUG <general>: CDVDClock::ErrorAdjust - CVideoPlayerAudio::OutputPacket - error:-10039.105164, adjusted:-10039.105164

2021-01-06 22:24:26.566 T:975 ERROR <general>: CAESinkALSA - snd_pcm_writei(-32) Broken pipe - trying to recover

Can I add the code above to the findcodec function to fix the dvd menu or will this break other codec functionality ?

Kind regards,

Ferry

New debug log for this version:

Thanxz I will check the settings and test again!

changed it to "start/stop" Adjust display refresh rate still got the errors

Changed it to "always" Adjust display refresh rate still got the errors

Also I see an error regarding the readrate:

Readrate 4814000 is too low with 5128350 required (on usb 3.0 disk)