Need helpt to run libjitsi example

Question

I am trying to use libjitsi to stream some audio, but I can't get it to work. I'm on Windows 10. Here's what I've done:

Clone https://github.com/jitsi/libjitsi.git
Import into Eclipse as a Maven project. Everything compiles fine.
I eventually realized (by looking at the Ant buildfile) that I needed some native libs, so I added the libs in /lib/native to the java.library.path.
I am running AVTransmit2 with --local-port-base=5100 --remote-host=localhost --remote-port-base=5200 and AVReceive2 with --local-port-base=5200 --remote-host=localhost --remote-port-base=5100.

When I run either file, I get a similar error. First I see

WARNING: Failed to initialize org.jitsi.impl.neomedia.device.DirectShowSystem
java.lang.reflect.UndeclaredThrowableException
    at org.jitsi.impl.neomedia.device.DeviceSystem.invokeDeviceSystemInitialize(DeviceSystem.java:441)
    ...
    at org.jitsi.service.libjitsi.LibJitsi.getMediaService(LibJitsi.java:124)
    at org.jitsi.examples.AVTransmit2.start(AVTransmit2.java:104)
    at org.jitsi.examples.AVTransmit2.main(AVTransmit2.java:359)
Caused by: java.lang.UnsatisfiedLinkError: org.jitsi.impl.neomedia.codec.FFmpeg.av_get_pix_fmt(Ljava/lang/String;)I
    at org.jitsi.impl.neomedia.codec.FFmpeg.av_get_pix_fmt(Native Method)
    ...

and then later in the logs I see

WARNING: Failed to initialize org.jitsi.impl.neomedia.device.DirectShowSystem
java.lang.reflect.UndeclaredThrowableException
    at org.jitsi.impl.neomedia.device.DeviceSystem.invokeDeviceSystemInitialize(DeviceSystem.java:441)
    at org.jitsi.impl.neomedia.device.DeviceSystem.invokeDeviceSystemInitialize(DeviceSystem.java:348)
    at org.jitsi.impl.neomedia.device.DeviceSystem.<init>(DeviceSystem.java:493)
    at org.jitsi.impl.neomedia.device.DeviceSystem.<init>(DeviceSystem.java:475)
    at org.jitsi.impl.neomedia.device.DirectShowSystem.<init>(DirectShowSystem.java:61)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at java.lang.Class.newInstance(Class.java:442)
    at org.jitsi.impl.neomedia.device.DeviceSystem.initializeDeviceSystems(DeviceSystem.java:288)
    at org.jitsi.impl.neomedia.device.DeviceSystem.initializeDeviceSystems(DeviceSystem.java:230)
    at org.jitsi.impl.neomedia.MediaServiceImpl.getDevices(MediaServiceImpl.java:577)
    at org.jitsi.impl.neomedia.MediaServiceImpl.getDefaultDevice(MediaServiceImpl.java:500)
    at org.jitsi.examples.AVTransmit2.start(AVTransmit2.java:119)
    at org.jitsi.examples.AVTransmit2.main(AVTransmit2.java:359)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.jitsi.impl.neomedia.jmfext.media.protocol.directshow.DataSource
    at org.jitsi.impl.neomedia.device.DirectShowSystem.doInitialize(DirectShowSystem.java:97)
    at org.jitsi.impl.neomedia.device.DeviceSystem.initialize(DeviceSystem.java:642)
    at org.jitsi.impl.neomedia.device.DeviceSystem$1.run(DeviceSystem.java:393)

Exception in thread "main" java.lang.IllegalArgumentException: direction
    at org.jitsi.service.neomedia.AbstractMediaStream.assertDirection(AbstractMediaStream.java:105)
    at org.jitsi.impl.neomedia.MediaStreamImpl.setDirection(MediaStreamImpl.java:2831)
    at org.jitsi.examples.AVTransmit2.start(AVTransmit2.java:128)
    at org.jitsi.examples.AVTransmit2.main(AVTransmit2.java:359)

Since I saw “ffmpeg” in the unsatisfied link error, I tried downloading ffmpeg from https://ffmpeg.zeranoe.com/builds/win64/shared/ffmpeg-4.1-win64-shared.zip. I chose the “shared” one because it has DLLs that I thought were needed to link the JNI interfaces to. I added the bin folder of the ffmpeg installtion to the java.library.path, but no joy - same error. It doesn't seem that any of their installers "install" anything - they just unzip files to the disk.

From the error stack, I’m guessing that somehow I’m missing some native libraries that are needed for DirectShow, but I cannot figure out what they should be.

Has anyone been able to get those examples to run? Is there something I need to install to get it working?

score 1 · Answer 1 · answered Jan 04 '19 at 18:37

Apparently there was something preventing the video media streams from initializing on every laptop I tried. But the audio streams were fine. By adding

if(mediaType != MediaType.AUDIO) continue;

inside the MediaType loop (using only AUDIO), I was able to get the example to work.

Need helpt to run libjitsi example

1 Answers1