mono stream plays on left channel only [solved]

[r.lucassen]

One of the mpd 0.19.21-1 (Debian Stretch) that I have is playing mono streams on only 1 channel (L). As other mpd instances running on Debian Stretch do not have this problem, I think it must be some ALSA config. There is no /etc/asound.conf and no ~/.asoundrc. I use an external Terratec USB sixfire soundcard. When playing the mono stream with "mplayer" the output is on both channels. This issue is mpd only, but AFAIK not an mpd problem. This is the alsa part of mpd.conf:

Code: Select all

audio_output {
        type            "alsa"
        name            "ALSA1"
        device          "hw:0,0"        # optional
        mixer_type      "hardware"      # optional
        mixer_device    "default"       # optional
        mixer_control   "Master"        # optional
        mixer_index     "0"             # optional
}

Anyone a hint why this could happen?

Richard.

[max]

Your MPD version is outdated and unsupported. See https://www.musicpd.org/help/

[r.lucassen]

I know it's outdated. I just was eager to know if there is a solution for this issue.

R.

[r.lucassen]

It also means that there is no support for mpd that is running on a stable version of one of the biggest distributions. And I'm not going to upgrade to an unstable or testing version, nor I want to run into a dependency hell to upgrade mpd.

R.

[skidoo]

There is no automatic mono to stereo conversion in MPD. Give asound.conf a try:

Code: Select all

pcm.!default dualmono

pcm.dualmono {
    type route
    slave.pcm "hw:0"
    ttable {
        0.0 1    # in-channel 0, out-channel 0, 100% volume
        0.1 1    # in-channel 0, out-channel 1, 100% volume
    }
}

[skidoo]

Or try to add

Code: Select all

format "*:*:2"

to your audio_output

[r.lucassen]

Yep, the:

Code: Select all

format "*:*:2"

did the job. Thnx!

R.

[max]

There is no automatic mono to stereo conversion in MPD.

Yes there is.

[skidoo]

@max> You're right. Found some note for my ancient multichannel audio interface and assumed it is valid for stereo too.