jack plugin freezes mpv.

[crocket]

I'm using alsa-plugin-1.1.8

mpv --audio-device=alsa/plug:rawjack /path/to/musicfile freezes mpv.
mpv doesn't freeze only when it plays a wav file.
I have to press Ctrl+C twice to kill mpv.

[aqxa1]

I've experienced that problem too, but turned out it was a faulty .asoundrc. Try removing .asoundrc, as there should be a default Jack pcm, as of alsa-plugin-1.1.7.

In your example, you could then use:

mpv --audio-device=alsa/jack /path/to/musicfile

You can also configure your .asoundrc to your liking, and point to the built in "jack" pcm.

[crocket]

> mpv --audio-device=alsa/jack /path/to/musicfile
cannot connect alsa-jack.jackP.17825.0:out_000 to alsa_pcm:playback_1

mpv --audio-device=alsa/plug:jack /path/to/musicfile just freezes.

[trebmuh]

@crocket : did you change /path/to/musicfile to fit with your own configuration?

[crocket]

Yes, I made it play a youtube video. Replacing it with a local video file doesn't change the outcome.

[aqxa1]

@crocket Try putting the following in ~/.asoundrc:

pcm.jacktest {                                                                                                                 
        type jack                                                                                                              
        playback_ports {                                                                                                       
                0 system:playback_1                                                                                            
                1 system:playback_2                                                                                            
        }                                                                                                                      
        capture_ports {                                                                                                        
                0 system:capture_1                                                                                             
                1 system:capture_2                                                                                             
        }                                                                                                                      
        hint {                                                                                                                 
                show {                                                                                                         
                        @func refer                                                                                            
                        name defaults.namehint.basic                                                                           
                }                                                                                                              
                description "JACK Audio Connection Kit"                                                                        
        }                                                                                                                      
}

Then:

mpv --ao=alsa --audio-device=alsa/jacktest "filename"

If that works, check that /usr/share/alsa/alsa.conf.d/50-jack.conf exists, and has the same content. Your second error looks like it's using alsa_pcm ports (which don't work for me either) instead of system.

Also, you should be able to just use mpv's JACK output directly, without going through ALSA.

Like this:

mpv --ao=jack "filename"

[crocket]

Many applications don't support JACK, and I want them to use JACK indirectly.

--audio-device=alsa/plug:jacktest freezes mpv, but --audio-device=alsa/jacktest doesn't.

dosbox requires plug:jacktest

[aqxa1]

It looks to have been fixed in alsa-plugins-1.1.9, which explains why I wasn't having the issue with the built in jack plugin. See: 613ac0c

So it should be enough to use the built in jack PCM, if you use alsa-plugins-1.1.9 or later.

[crocket]

I'm going to close it for now. I will reopen a new issue when the issue happens again.