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wrong audio output on raspberry pi3 running processing sketch

hugolbhugolb
edited March 2018 in Raspberry PI

Hi everyone, I'm working with GLvideo library on Rpi (Raspbian) and I'm having this problem: The sound of my video goes straight through the HDMI out, and never through my usb soundcard, even though I've setted it as "default" with alsamixer. I found on an old forum that it could be a problem from java wich don't respect the default audio output... Anyone has an idea? Thanks for any help, and sorry for my my french-english style.

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  • kfrajerkfrajer

    I found on an old forum that it could be a problem from java wich don't respect the default audio output

    Can you provide a link to that post? Also, tagging @gohai as he might be able to help.

    Kf

  • gohaigohai

    No sorry, I don't have an answer to this one.

  • hugolbhugolb
    edited March 2018

    Hi kfrajer! Thanks for your quick answer. Hi Gohai! Quite sad you don't have the answer :/ But Great work for your lib!. The sound works fine for you?

    This is what i read: https://raspberrypi.stackexchange.com/questions/1337/how-can-i-get-java-sound-to-work It says that with a command line he is able to play a song but not with his java app on raspbian. In fact, OMX player works but not my processing app, so i thought it could be an idea. BUT, it was posted 5 years ago. Thanks again for your answers.

  • gohaigohai

    It's definitely not a issue with Java, as the GLVideo library uses GStreamer for video decoding and handling of the audio

  • hugolbhugolb

    Okay, so do you think it could be a problem of encoding? I didn't found indication on encoding audio for glvideo, but I tried on my Mac and it works.

  • gohaigohai

    If it is playing back, just on a different output than the one you like it to play: no, I don't believe this is related to encoding.

  • hugolbhugolb

    You must be right. I'll try to reinstall the entire OS and re-check every audio settings. Thanks! Still, if anyone has an other idea...

  • hugolbhugolb

    Hi! Still not working. YouTube works perfect, but not my processing sketch! I verified my audio configuration. @gohai is there a trick with the volume() function? My movie is declared as GLMovie, is that right or is this GLVideo? Thanks.

  • hugolbhugolb

    As it doesn't works with processing, I'm thinking about gstreamer. Is there something to install ?

  • gohaigohai

    @hugodb Try playing back your video using gst-launch-1.0.

    Something like this should work: gst-launch-1.0 playbin uri=file:///path/to/movie.mp4

  • hugolbhugolb

    Good morning, gst-launch-1.0 didn't work, but gst-launch gave me this error:

    gst-launch playbin uri=file:/pathtovideo.mp4 (wich is H264, audio AAC) Setting pipeline to PAUSED ... ** Message: don't know how to handle video/quicktime, variant=(string)iso Pipeline is PREROLLING ... Missing element: Quicktime demuxer ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin0: A Quicktime demuxer plugin is required to play this stream, but not installed. Additional debug info: gstdecodebin.c(1003): close_pad_link (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0: No decoder to handle media type 'video/quicktime' ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ...

  • hugolbhugolb

    My gst version is the 0.10. Is i the right one?

  • hugolbhugolb
    Answer ✓

    I got the answer!!! After a long long time searching for soluttions, I found on forums discussions that some users of RPi installed Pulse Audio to route audio from different apps to a audoi output. So, if you hve thi problem: -->apt-get install pulseaudio -->apt-get install pavucontrol -->reboot --> nano /etc/pulse/default.pa -->find and uncomment the line "load-module module-alsa-sink and...that's it! Thanks again gohai for your answers.

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