kodi-rpi 19.1-4 crackling audio

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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Mon May 17, 2021 11:43 am

I found an old pair of headphones and plugged them into the jack. I don't see a corresponding option for audio output directed out that jack.
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Mon May 17, 2021 12:05 pm

I forgot to copy the first line from my config.txt, here's the complete file:
Code: Select all
dtparam=audio=on
dtoverlay=vc4-kms-v3d,cma-512
dtoverlay=rpivid-v4l2
disable_overscan=1
disable_fw_kms_setup=1
initramfs initramfs-linux.img followkernel
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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Mon May 17, 2021 12:34 pm

I can confirm the audio crackle. Since disabling HW accel decoding reverses the crackle (tested by you, I did not verify), that points to something in the gbm_matrix branch by popcornmix as causing it. Recommend you open a post on the kodi forum mentioning that you are using popcornmix's gbm_matrix branch and use the @popcornmix tag in your post so he gets a ping.
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Mon May 17, 2021 12:46 pm

Thanks a lot for confirming the issue. Will post to kodi forum.
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Mon May 17, 2021 1:10 pm

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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Mon May 17, 2021 4:34 pm

unformatted wrote:Just posted on kodi forum, https://forum.kodi.tv/showthread.php?tid=362663


Thanks, I updated kodi-config.txt with this: https://github.com/archlinuxarm/PKGBUIL ... c3ba55171b
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Tue May 18, 2021 3:55 pm

@graysky

I reported on kodi forum that audio_pwm_mode=1 did the trick but unfortunately there's another problem introduced with this setting. On my test setup (analog speaker connected to jack) I reported a constant noise which I suspected to be in the high volume setting of the speaker. I updated my daughter's Pi yesterday and thought it was ok then. Today she complained about a loud hissing sound comming out of the speaker (another type then my test speaker) and I can confirm that putting her speaker on my test setup indeed produces a loud hissing sound. So I took a good quality headphone and connected it and there's also this loud hissing sound. So I tested with a cheap speaker apparently which cuts of the high frequencies and thus masking the hissing sound.

Can you please test again to confirm this before I report this back to kodi forum?
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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Tue May 18, 2021 7:01 pm

If you confirmed the behavior on 2 separate boxes, no real point in me doing it on a third.
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Wed May 19, 2021 5:54 am

Ok then, I just posted on the kodi forum.
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