kodi-rpi 19.1-4 crackling audio

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kodi-rpi 19.1-4 crackling audio

Postby unformatted » Sun May 16, 2021 11:48 am

There is now an issue with the analog audio output which wasn't there a while ago. I'm on RPi4 with latest kodi-rpi 19.1-4. When I play movies the analog audio output is crackling and speech is very distorted. This does not happen with live TV and radio. When I select "Only allow acceleration for HEVC" the movie is software decoded and the sound is ok. So there still is a problem with hardware acceleration regarding the analog audio output.
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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Sun May 16, 2021 12:10 pm

Mod note - split out into own thread
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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Sun May 16, 2021 12:20 pm

unformatted wrote:There is now an issue with the analog audio output which wasn't there a while ago. I'm on RPi4 with latest kodi-rpi 19.1-4. When I play movies the analog audio output is crackling and speech is very distorted.


Are you sure the source file is not the problem? What format is the audio (use mediainfo to find out)? Does the problematic file play fine under the previous 19.0 release of kodi-rpi?
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Sun May 16, 2021 12:54 pm

Kodi 19.0 was fine. I have this problem with all my movies so far. For example Avatar 2009.mp4 (ripped from DVD):
Code: Select all
Video decoder: ff-h264_v4l2m2m-drm_prime (HW)
Audio stream: FL, FR, ff-aac, 32 bits, 48,000 Hz

has distorted sound and crackling when there is sound (if quit then no crackling).

When I turn off HW decoding:
Code: Select all
Video decoder: ff-h264-drm_prime (SW)
Audio stream: FL, FR, ff-aac, 32 bits, 48,000 Hz

and sound is ok.

So far I tested over a dozen various movies, with some the problem is less obvious but still there. When there is low sound in the movie it seems ok but as soon as there is speech the distortion happens. But when I play my test movie sintel-1080-cfg02.mkv the sound is ok:
Code: Select all
Video decoder: ff-hevc-drm_prime (HW)
Audio stream: FL, FR, FC, LFE, BL, BR, ff-aac, 32 bits, 48,000 Hz


I have quite a collection of movies which I ripped from DVD to my NAS and they all have this problem which did not occur until at least kodi 19.0.

I'm on a fresh RPI4 armv7l install with fresh kodi, no customizations. Here's my config.txt:
Code: Select all
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 » Sun May 16, 2021 1:06 pm

In order to report upstream or for me to test on my own box, you'll need to verify the behavior using a copyright free source. Here is an example clip you can try:
Code: Select all
wget http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4


Video is h264 and audio is AAC. Does it playback for you with accel correctly?
Code: Select all
Video decoder: ff-h264_v4l2m2m-drm_prime (HW)
Audio stream: FL, FR, ff-aac, 32 bits, 44,100 Hz
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Sun May 16, 2021 1:18 pm

With HW decoding it crackles, with SW decoding it's ok.
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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Sun May 16, 2021 1:21 pm

So it plays fine on my setup... can you try a quick experiment:

1) stop kodi
2) make a fresh profile*
3) start kodi and verify it's still an issue

* this should work:
Code: Select all
mv /var/lib/kodi /var/lib/kodi-backup
mkdir /var/lib/kodi
chown kodi:kodi /var/lib/kodi
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Sun May 16, 2021 1:29 pm

I already had a fresh profile, it was a fresh install including arch arm. I followed your steps but same issue. Does it play ok for you on the jack output or are you on hdmi?
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Re: kodi-rpi 19.1-4 crackling audio

Postby graysky » Sun May 16, 2021 3:10 pm

Code: Select all
System>Audio>Audio output device = vc4-hdmi-0 (vc4hdmi0), MAI PCM vc4-hdmi-hifi0


Do you have any special setup? Unique hardware? External receiver? Using pulseaudio?
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Re: kodi-rpi 19.1-4 crackling audio

Postby unformatted » Mon May 17, 2021 5:58 am

I'm affraid there's a misunderstanding here. I stated in my first post that I'm on the analog audio output, meaning the 3.5mm jack connector. Can you test on this output instead of hdmi? The hdmi sound is fine, it's the analog output which is craclking.
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