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• Cannot get JACK Audio/Netjack working over LAN

  23 juin 2020, par James

  I'm trying to stream low latency audio between 2 raspberry pis. Both gstreamer and ffmpeg induce 2+ second delays for me.

  



  I've played around with Jack Audio and locally on a single pi it seems promising. I can route mic input to a speaker locally and it is almost instantaneous.

  



  However, I have been having trouble getting it to route between devices using Netjack.

  



  # ON SERVER
jackd -P70 -p16 -t2000 -dalsa -dhw:1 -p128 -n3 -r44100 -s 

# ON CLIENT
jackd -v -R -P70 -dnetone -i1 -o1 -I0 -O0  -r44100 -p128 -n3

# ON SERVER
jack_netsource -H < ip address of client >
jack_lsp # list availible connection ports

>system:capture_1
>system:playback_1
>system:playback_2
>netjack:capture_1
>netjack:capture_2
>netjack:capture_3
>netjack:playback_1
>netjack:playback_2
>netjack:playback_3

jack_connect system:capture_1 system:playback_1 # this works
jack_connect system:capture_1 netjack:playback_1 # this doesn't work :(


  



  Most of the launch options I pulled from here http://wiki.linuxaudio.org/wiki/raspberrypi#using_jack. I'll be honest I don't really know what they do.

  



  The client jackd output shows messages like

  



  Jack: data not valid
Jack: data not valid
Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6
Jack: JackRequest::Notification
Jack: JackEngine::ClientNotify: no callback for notification = 3
Jack: JackEngine::ClientNotify: no callback for notification = 3
netxruns... duration: 139ms
Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6
Jack: JackRequest::Notification
Jack: JackEngine::ClientNotify: no callback for notification = 3
Jack: JackEngine::ClientNotify: no callback for notification = 3


  



  And the server jack_netsource output looks like

  



  current latency 114
current latency 20
current latency 27
current latency 29
current latency 48
current latency 23
current latency 33
current latency 28
current latency 41
current latency 84
current latency 44


  



  and the server jackd output looks like

  



  JackAudioDriver::ProcessGraphAsyncMaster: Process error
JackAudioDriver::ProcessGraphAsyncMaster: Process error
JackAudioDriver::ProcessGraphAsyncMaster: Process error
JackAudioDriver::ProcessGraphAsyncMaster: Process error
JackEngine::XRun: client = netjack was not finished, state = Triggered
JackAudioDriver::ProcessGraphAsyncMaster: Process error
JackAudioDriver::ProcessGraphAsyncMaster: Process error
JackEngine::XRun: client = netjack was not finished, state = Triggered
JackEngine::XRun: client = netjack was not finished, state = Triggered


  



  I believe the -dnetone flag indicates to use Netjack2. Netjack 1, which I've tried with the -dnet flag results in a single Not Connected message from jack_netsource and :

  



  Jack: CatchHost fd = 5 err = Resource temporarily unavailable
Jack: CatchHost fd = 5 err = Resource temporarily unavailable
Jack: CatchHost fd = 5 err = Resource temporarily unavailable
Jack: CatchHost fd = 5 err = Resource temporarily unavailable
Jack: CatchHost fd = 5 err = Resource temporarily unavailable
Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6


  



  from the client jackd.

  


• Cannot get JACK Audio/Netjack working over LAN

  19 septembre 2016, par James

  I’m trying to stream low latency audio between 2 raspberry pis. Both gstreamer and ffmpeg induce 2+ second delays for me.

  I’ve played around with Jack Audio and locally on a single pi it seems promising. I can route mic input to a speaker locally and it is almost instantaneous.

  However, I have been having trouble getting it to route between devices using Netjack.

  # ON SERVER
  
  jackd -P70 -p16 -t2000 -dalsa -dhw:1 -p128 -n3 -r44100 -s 
  
  
  
  # ON CLIENT
  
  jackd -v -R -P70 -dnetone -i1 -o1 -I0 -O0  -r44100 -p128 -n3
  
  
  
  # ON SERVER
  
  jack_netsource -H < ip address of client >
  
  jack_lsp # list availible connection ports
  
  
  
  >system:capture_1
  
  >system:playback_1
  
  >system:playback_2
  
  >netjack:capture_1
  
  >netjack:capture_2
  
  >netjack:capture_3
  
  >netjack:playback_1
  
  >netjack:playback_2
  
  >netjack:playback_3
  
  
  
  jack_connect system:capture_1 system:playback_1 # this works
  
  jack_connect system:capture_1 netjack:playback_1 # this doesn't work :(

  Most of the launch options I pulled from here http://wiki.linuxaudio.org/wiki/raspberrypi#using_jack. I’ll be honest I don’t really know what they do.

  The client jackd output shows messages like

  Jack: data not valid
  
  Jack: data not valid
  
  Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6
  
  Jack: JackRequest::Notification
  
  Jack: JackEngine::ClientNotify: no callback for notification = 3
  
  Jack: JackEngine::ClientNotify: no callback for notification = 3
  
  netxruns... duration: 139ms
  
  Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6
  
  Jack: JackRequest::Notification
  
  Jack: JackEngine::ClientNotify: no callback for notification = 3
  
  Jack: JackEngine::ClientNotify: no callback for notification = 3

  And the server jack_netsource output looks like

  current latency 114
  
  current latency 20
  
  current latency 27
  
  current latency 29
  
  current latency 48
  
  current latency 23
  
  current latency 33
  
  current latency 28
  
  current latency 41
  
  current latency 84
  
  current latency 44

  and the server jackd output looks like

  JackAudioDriver::ProcessGraphAsyncMaster: Process error
  
  JackAudioDriver::ProcessGraphAsyncMaster: Process error
  
  JackAudioDriver::ProcessGraphAsyncMaster: Process error
  
  JackAudioDriver::ProcessGraphAsyncMaster: Process error
  
  JackEngine::XRun: client = netjack was not finished, state = Triggered
  
  JackAudioDriver::ProcessGraphAsyncMaster: Process error
  
  JackAudioDriver::ProcessGraphAsyncMaster: Process error
  
  JackEngine::XRun: client = netjack was not finished, state = Triggered
  
  JackEngine::XRun: client = netjack was not finished, state = Triggered

  I believe the -dnetone flag indicates to use Netjack2. Netjack 1, which I’ve tried with the -dnet flag results in a single Not Connected message from jack_netsource and :

  Jack: CatchHost fd = 5 err = Resource temporarily unavailable
  
  Jack: CatchHost fd = 5 err = Resource temporarily unavailable
  
  Jack: CatchHost fd = 5 err = Resource temporarily unavailable
  
  Jack: CatchHost fd = 5 err = Resource temporarily unavailable
  
  Jack: CatchHost fd = 5 err = Resource temporarily unavailable
  
  Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6

  from the client jackd.

• Compile ffmpeg for armv7s

  14 août 2014, par user3929400

  I am trying to compile ffmpeg on OSX 10.9. I want to use the ffmpeg framework in an iOS testapplication using xCode.

  I want to link the libfaac to ffmpeg and compile it for armv7s. When I follow the compilation guide (https://trac.ffmpeg.org/wiki/CompilationGuide/MacOSX) on the ffmpeg site, it does not work.

  I used the following configuration :

  ./configure  --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --arch=armv7s

  Another configuration I tried is

  ./configure  --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --arch=armv7s --enable-cross-compile --target-os=darwin

  The difference between both configuration is the cross compile and target os.

  Both configuration produces the following error message :

  GNU assembler not found, install gas-preprocessor

  Although, I have copied gas-preprocessor.pl into the directories /usr/local/bin and /usr/bin and modified the file read-write props by using chmod +x gas-preprocessor.pl

  Can somebody help me to configure ffmpeg by giving for example an example configuration which does work ?