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+--- Thread: [PROBLEM] Crackling audio when playing 5.1 FLAC over HDMI (/showthread.php?tid=3749)
Crackling audio when playing 5.1 FLAC over HDMI - DavidGA - 04-29-2021
When playing a 5.1 channel FLAC file over HDMI, the surround channels are reproduced correctly, but with a constant crackling noise over the audio.
Moode r710 on a Raspberry Pi 4 connected by HDMI to a Denon surround receiver.
Stereo files play perfectly fine.
RE: Crackling audio when playing 5.1 FLAC over HDMI - DRONE7 - 04-29-2021
Afaik MPD does not support surround....stereo output only.
A quick search of the forums finds this thread...
http://moodeaudio.org/forum/showthread.php?tid=1759&highlight=5.1++surround
The MPD docs are here...
https://www.musicpd.org/doc/html/user.html
RE: Crackling audio when playing 5.1 FLAC over HDMI - DavidGA - 04-30-2021
That thread is about creating an AC3 or DTS stream over an optical toslink connection.
HDMI supports uncompressed surround output, and as I said in the original post, it's *already* doing so. The surround is there, it's just all crackly and noisy.
RE: Crackling audio when playing 5.1 FLAC over HDMI - DRONE7 - 05-02-2021
(04-30-2021, 11:10 PM)DavidGA Wrote: That thread is about creating an AC3 or DTS stream over an optical toslink connection.
HDMI supports uncompressed surround output, and as I said in the original post, it's *already* doing so. The surround is there, it's just all crackly and noisy.
1) correct, but a search failed to find any other threads relevant to HDMI and surround.
2)"HDMI supports uncompressed surround output" but AFAIK MPD does not.
3) I'm happy to be proved wrong
and if you can find any reference in the linked MPD documents to surround over HDMI then please post and we can take it from there...
RE: Crackling audio when playing 5.1 FLAC over HDMI - DRONE7 - 05-13-2021
Post the output when you run...
Code:
alsacapRE: Crackling audio when playing 5.1 FLAC over HDMI - DavidGA - 07-14-2021
I restested with r730 and the problem persists. Here's the output of alsacap:
Code:
*** Scanning for playback devices ***
Card 0, ID `b1', name `bcm2835 HDMI 1'
Device 0, ID `bcm2835 HDMI 1', name `bcm2835 HDMI 1', 4 subdevices (3 available)
1..8 channels, sampling rate 8000..192000 Hz
Sample formats: U8, S16_LE
Buffer size range from 80 to 131072
Period size range from 80 to 131072
Subdevice 0, name `subdevice #0'
Subdevice 1, name `subdevice #1'
Subdevice 2, name `subdevice #2'
Subdevice 3, name `subdevice #3'
Card 1, ID `Headphones', name `bcm2835 Headphones'
Device 0, ID `bcm2835 Headphones', name `bcm2835 Headphones', 4 subdevices (4 available)
1..8 channels, sampling rate 8000..192000 Hz
Sample formats: U8, S16_LE
Buffer size range from 80 to 131072
Period size range from 80 to 131072
Subdevice 0, name `subdevice #0'
Subdevice 1, name `subdevice #1'
Subdevice 2, name `subdevice #2'
Subdevice 3, name `subdevice #3'RE: Crackling audio when playing 5.1 FLAC over HDMI - Tim Curtis - 07-14-2021
You should prolly post in the MPD repo.
https://github.com/MusicPlayerDaemon/MPD/issues
RE: Crackling audio when playing 5.1 FLAC over HDMI - DRONE7 - 07-14-2021
Agree with Tim's recommendation.seems your available formats/card specs may not align with surround output....
Perhaps the available formats in hardware do not align..?
Code:
Sample formats: U8, S16_LEI have not used this (yet) but it may be of some help ?
https://www.mythtv.org/wiki/Using_ALSA%27s_speaker-test_utility