"Cannot create gstreamer element: webrtcendpoint"

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Stefan Hellkvist

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Sep 26, 2014, 3:37:23 AM9/26/14
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Hi,

Following the installation instructions in the current 5.0.3 docs I installed the media-server with apt-get and then cloned the kurento-tutorial-java trying to run the hello-world demo there with "mvn compile exec:java". Everything compiles and starts fine. 

When I access the page and start streaming from the hello world browser page I get the following exception however:

07:47:40.589 [081-exec-4] ERROR - o.a.c.c.C.[.[.[/].[dispatcherServlet]    - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.kurento.client.internal.server.KurentoServerException: Exception invoking the ] with root cause
org.kurento.jsonrpc.JsonRpcErrorException: Cannot create gstreamer element: webrtcendpoint. Data: {"code":40107,"message":"Cannot create gstreamer element: webrtcendpoint"}
at org.kurento.jsonrpc.internal.JsonRpcRequestSenderHelper.sendRequest(JsonRpcRequestSenderHelper.java:86) ~[kurento-jsonrpc-client-5.0.3.jar:5.0.3]
at org.kurento.jsonrpc.internal.JsonRpcRequestSenderHelper.sendRequest(JsonRpcRequestSenderHelper.java:69) ~[kurento-jsonrpc-client-5.0.3.jar:5.0.3]
at org.kurento.jsonrpc.client.JsonRpcClient.sendRequest(JsonRpcClient.java:81) ~[kurento-jsonrpc-client-5.0.3.jar:5.0.3]

....and so on


My question is: Is there another package that I need to install in order to install the gstreamer endpoints that you have developed and which one would that be then? Was this either missing in the documentation or missing as a dependency for the kurento-media-server package perhaps?

Regards,
Stefan

Stefan Hellkvist

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Sep 26, 2014, 3:39:50 AM9/26/14
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Btw, I get similar log entries in /var/log/kurento-media-server/media-server.log

0:06:24.308166214 ESC[333m15356ESC[00m      0x10bd980 ESC[37mDEBUG  ESC[00m ESC[
00mKurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/tra
nsport/websocket/WebSocketTransport.cpp:439:processMessage:ESC[00m Response: >{"
error":{"code":-32000,"data":{"code":40107,"message":"Cannot create gstreamer el
ement: webrtcendpoint"},"message":"Cannot create gstreamer element: webrtcendpoint"},"id":2,"jsonrpc":"2.0"}

Ivan Gracia

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Sep 26, 2014, 3:43:39 AM9/26/14
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Hi Stefan,

Could you please send us the full KMS log file?

Thanks,

Ivan Gracia



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Ivan Gracia

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Sep 26, 2014, 3:51:19 AM9/26/14
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That package should be installed already, but check it anyway. How did you install kurento-media-server? Was it an update from the previous version, or a clean install? If you could please provide
  • The output of dpkg -l | grep kms
  • The server log file
It would give us a lot of information as to what is happening.

Ivan Gracia



On 26 September 2014 09:47, Stefan Hellkvist <hell...@gmail.com> wrote:
Could it be the kms-elements package that I need to install perhaps?

Micael Gallego

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Sep 26, 2014, 3:57:58 AM9/26/14
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I had the same problem. I solved it removing all kurento packages in muy system and reinstalling all again.

I think I had dependencies from different versions.

Ivan Gracia

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Sep 26, 2014, 4:00:29 AM9/26/14
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You might not need to go as far as that. As Mica says, we've seen this before, but just wanted to be on the safe side as to what is happening.

Ivan Gracia


Stefan Hellkvist

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Sep 26, 2014, 4:42:58 AM9/26/14
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Some more information:

This was on a clean 14.04 machine where I had not touched anything kurento-related before so the problem is not related to any prior installation or old remains of that. 

The only thing I did was following the installation docs and installed the following:

sudo add-apt-repository ppa:kurento/kurento
wget -O - http://ubuntu.kurento.org/kurento.gpg.key | sudo apt-key add -
sudo apt-get update
sudo apt-get install kurento-media-server


Here follows the information you asked for (and some more):

$ cat /etc/issue
Ubuntu 14.04.1 LTS \n \l

$ uname -a
Linux ubuntu 3.13.0-35-generic #62-Ubuntu SMP Fri Aug 15 01:58:42 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

$ ls -l /usr/lib/x86_64-linux-gnu/kurento/modules
total 116
-rw-r--r-- 1 root root 26904 Sep 22 10:59 libkmscoremodule.so
-rw-r--r-- 1 root root 55576 Sep 22 11:20 libkmselementsmodule.so
-rw-r--r-- 1 root root 31000 Sep 22 11:33 libkmsfiltersmodule.so

$ dpkg -l | grep kms
ii  kms-core                                              5.0.3-trusty                                        amd64        Kurento core module
ii  kms-elements                                          5.0.3-trusty                                        amd64        Kurento elements module
ii  kms-filters                                           5.0.3-trusty                                        amd64        Kurento filters module
ii  kms-gstmarshal                                        1.0.0-trusty                                        amd64        Kurento marshal library
ii  kms-jsonrpc                                           0.1.1-trusty                                        amd64        Kurento jsonrpc library
rc  libkms1:amd64                                         2.4.39-0ubuntu0.1                                   amd64        Userspace interface to kernel DRM buffer management


$ dpkg -l | grep kurento
ii  gstreamer1.0-plugins-bad:amd64                        1.4.1-1ubuntu1kurento1                              amd64        GStreamer plugins from the "bad" set
ii  gstreamer1.0-plugins-bad-faad:amd64                   1.4.1-1ubuntu1kurento1                              amd64        GStreamer faad plugin from the "bad" set
ii  gstreamer1.0-plugins-bad-videoparsers:amd64           1.4.1-1ubuntu1kurento1                              amd64        GStreamer videoparsers plugin from the "bad" set
ii  gstreamer1.0-plugins-base:amd64                       1.4.1-1~kurento1                                    amd64        GStreamer plugins from the "base" set
ii  gstreamer1.0-plugins-good:amd64                       1.4.1-1ubuntu1kurento1                              amd64        GStreamer plugins from the "good" set
ii  gstreamer1.0-plugins-ugly:amd64                       1.4.1-1~kurento1                                    amd64        GStreamer plugins from the "ugly" set
ii  kurento-media-server                                  5.0.2-trusty                                        amd64        Kurento Media Server
ii  libgstreamer-plugins-bad1.0-0:amd64                   1.4.1-1ubuntu1kurento1                              amd64        GStreamer development files for libraries from the "bad" set
ii  libgstreamer-plugins-base1.0-0:amd64                  1.4.1-1~kurento1                                    amd64        GStreamer libraries from the "base" set
ii  libgstreamer-plugins-good1.0-0:amd64                  1.4.1-1ubuntu1kurento1                              amd64        GStreamer development files for libraries from the "good" set
ii  libgstreamer1.0-0:amd64                               1.4.1-1~kurento1                                    amd64        Core GStreamer libraries and elements



$ cat /var/log/kurento-media-server/media-server.log
0:00:07.696440027 15356      0x10426d0 INFO      KurentoMediaServer /build/buildd/kurento-media-server-5.0.2/server/main.cpp:183:main: Kmsc version: 5.0.2
0:00:07.696565542 15356      0x10426d0 INFO      KurentoMediaServer /build/buildd/kurento-media-server-5.0.2/server/main.cpp:66:load_config: Reading configuration from: /etc/kurento/kurento.conf.json
0:00:07.720167656 15356      0x10426d0 INFO      KurentoMediaServer /build/buildd/kurento-media-server-5.0.2/server/main.cpp:73:load_config: Configuration loaded successfully
0:00:07.720338435 15356      0x10426d0 INFO    KurentoModuleManager /build/buildd/kms-core-5.0.3/src/server/implementation/ModuleManager.cpp:99:loadModules: Looking for modules in /usr/lib/x86_64-linux-gnu/kurento/modules
0:00:08.028144088 15356      0x10426d0 INFO    KurentoModuleManager /build/buildd/kms-core-5.0.3/src/server/implementation/ModuleManager.cpp:74:loadModule: Module /usr/lib/x86_64-linux-gnu/kurento/modules/libkmselementsmodule.so loaded
0:00:08.028999213 15356      0x10426d0 INFO    KurentoModuleManager /build/buildd/kms-core-5.0.3/src/server/implementation/ModuleManager.cpp:74:loadModule: Module /usr/lib/x86_64-linux-gnu/kurento/modules/libkmsfiltersmodule.so loaded
0:00:08.029262746 15356      0x10426d0 INFO    KurentoModuleManager /build/buildd/kms-core-5.0.3/src/server/implementation/ModuleManager.cpp:74:loadModule: Module /usr/lib/x86_64-linux-gnu/kurento/modules/libkmscoremodule.so loaded
0:00:08.099068622 15356      0x10426d0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:197:WebSocketTransport: Secure websocket server not enabled
0:00:08.099478582 15356      0x10426d0 INFO      KurentoMediaServer /build/buildd/kurento-media-server-5.0.2/server/main.cpp:194:main: Mediaserver started
0:06:24.133985603 15356      0x10bd980 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:458:openHandler: Client connected from 
0:06:24.227529401 15356 0x7f9520002520 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:437:processMessage: Message: >{"id":1,"method":"create","params":{"type":"MediaPipeline","constructorParams":{}},"jsonrpc":"2.0"}<
0:06:24.233666315 15356 0x7f9520002520 DEBUG   KurentoServerMethods /build/buildd/kurento-media-server-5.0.2/server/ServerMethods.cpp:193:postProcess: Caching: {"id":1,"jsonrpc":"2.0","result":{"sessionId":"861f1ea9-9c39-4399-86f9-249814d9a6d0","value":"74e2eaaf-a743-4185-8fba-5522917d483f"}}

0:06:24.233909894 15356 0x7f9520002520 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:439:processMessage: Response: >{"id":1,"jsonrpc":"2.0","result":{"sessionId":"861f1ea9-9c39-4399-86f9-249814d9a6d0","value":"74e2eaaf-a743-4185-8fba-5522917d483f"}}
<
0:06:24.233994970 15356 0x7f9520002520 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:391:storeConnection: Asociating session 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:06:24.306129841 15356      0x10bd980 WARN    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:297:injectSessionId: Injecting sessionId 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:06:24.306270595 15356      0x10bd980 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:437:processMessage: Message: >{"id":2,"jsonrpc":"2.0","method":"create","params":{"constructorParams":{"mediaPipeline":"74e2eaaf-a743-4185-8fba-5522917d483f"},"sessionId":"861f1ea9-9c39-4399-86f9-249814d9a6d0","type":"WebRtcEndpoint"}}
<
0:06:24.307980296 15356      0x10bd980 DEBUG   KurentoServerMethods /build/buildd/kurento-media-server-5.0.2/server/ServerMethods.cpp:193:postProcess: Caching: {"error":{"code":-32000,"data":{"code":40107,"message":"Cannot create gstreamer element: webrtcendpoint"},"message":"Cannot create gstreamer element: webrtcendpoint"},"id":2,"jsonrpc":"2.0"}

0:06:24.308166214 15356      0x10bd980 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:439:processMessage: Response: >{"error":{"code":-32000,"data":{"code":40107,"message":"Cannot create gstreamer element: webrtcendpoint"},"message":"Cannot create gstreamer element: webrtcendpoint"},"id":2,"jsonrpc":"2.0"}
<
0:07:08.115937974 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:08:08.126603471 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:09:08.126935643 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:10:08.127617524 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:10:24.235720242 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:11:08.128044471 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:12:08.128377322 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:13:08.129768214 15356 0x7f9518001cc0 INFO    KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:227:keepAliveSessions: Keep alive 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:13:55.674481992 15356 0x7f9520002520 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:497:closeHandler: Connection closed
0:13:55.674544247 15356 0x7f9520002520 DEBUG   KurentoWebSocketTransport /build/buildd/kurento-media-server-5.0.2/server/transport/websocket/WebSocketTransport.cpp:503:closeHandler: Erasing connection associated with: 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:14:24.236481705 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:18:24.236846785 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:18:24.236934019 15356 0x7f951c001a70 WARN         KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:73:doGarbageCollection: Session timeout: 861f1ea9-9c39-4399-86f9-249814d9a6d0
0:18:24.237039542 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:358:releasePointer: Destroying MediaPipeline -> 74e2eaaf-a743-4185-8fba-5522917d483f
0:22:24.238516608 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:26:24.239240429 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:30:24.240469300 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:34:24.241624818 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:38:24.242728586 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:42:24.244320596 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:46:24.245066150 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:50:24.245358033 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:54:24.247508526 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
0:58:24.248789308 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
1:02:24.250458830 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
1:06:24.250843507 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector
1:10:24.251450819 15356 0x7f951c001a70 DEBUG        KurentoMediaSet /build/buildd/kms-core-5.0.3/src/server/implementation/MediaSet.cpp:65:doGarbageCollection: Running garbage collector


/Stefan

Stefan Hellkvist

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Sep 26, 2014, 4:53:47 AM9/26/14
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I see from this information that the version of media-server that got installed through this process was 5.0.2 whereas the elements plugin etc are on 5.0.3. I do not know if this matters however. 

/Stefan

Boni García

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Sep 26, 2014, 5:48:46 AM9/26/14
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Hi Stefan,

Could you please try this?

sudo apt-get remove kurento*
sudo apt-get autoremove
sudo apt-get install kurento-media-server

And start the demo again.

Kind regards,
Boni


Jose Antonio Santos Cadenas

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Sep 26, 2014, 6:42:48 AM9/26/14
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Hi Stefan,

We have detected a problem on the generation of gstmarshal library, we are currently solving it and creating new packages with the problem fixed on our internal debian repository (it seems from your previous emails that you already have it configured). It should be fixed in some minutes.

If the problems persist after the upgrade, you should try to remove gstreamer cache from the user that launches the media-server:

 rm ~/.cache/gstreamer-1.0/registry.*.bin

Stefan Hellkvist

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Sep 26, 2014, 6:43:32 AM9/26/14
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Tried it, I get the same problem unfortunately. 

/Stefan

Stefan Hellkvist

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Sep 26, 2014, 6:47:45 AM9/26/14
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Ok, I will try again in some time then. Thanks for the help! 

/Stefan

Stefan Hellkvist

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Sep 26, 2014, 7:46:00 AM9/26/14
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Just to clarify things. 

Did you just replace the kms-gstmarshal package with a new package with the same version or did you increment the version number? My system seems to think that it still has the latest version. Or have you not uploaded it yet? 

The user running the kurento-media-server is "nobody" thus there is no home folder for the gstreamer cache that you refer to. 

Jose Antonio Santos Cadenas

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Sep 26, 2014, 8:19:08 AM9/26/14
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Sorry, I thought you were using development debian repository, I misunderstood a previous email. What I did is to create a new packages versions for kms-gstmarshal and kms-elements, but this versions are uploaded to development repository until we perform a release.

The version uploaded to launchpad ppa should not have this problem, I tested it this morning. Nevertheless we will try to perform a patch release as soon as posible.

Stefan Hellkvist

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Sep 26, 2014, 8:22:57 AM9/26/14
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So then it could be another problem that I am having. I am seeing this problem on the launchpad ppa. 

So what are my options then to solve this? To wait for 5.0.3 to be available on lauchpad? When would that be? 


/Stefan

Jose Antonio Santos Cadenas

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Sep 26, 2014, 8:37:54 AM9/26/14
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I've double checked that upstream packages can link libraries correctly and they should. You should have a different problem. Have you tried restarting media server?

   sudo service kurento-media-server stop
check that it really stopped with:
   ps aux | grep kurento

it is not stopped you can kill it with:
   sudo killall -9 kurento-media-server

and then restart it with:
   sudo service kurento-media-server start

and check again if the error persists.

A patch release will be done in less than a week.

Stefan Hellkvist

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Sep 26, 2014, 8:51:43 AM9/26/14
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Yes, I have restarted it several times but the problems stays. 

On a new clean machine, the installation procedure mentioned above (the one in the 5.0.3 documentation) leads to an install having this problem for me (tried it twice now). 

If you are not saying that the install procedure should be any different I will try to investigate this a bit further and repeating the procedure on more hardware. We'll see what happens. Are you sure that you do not have any other stuff installed from your dev setup that makes it work for you? 

Jose Antonio Santos Cadenas

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Sep 26, 2014, 9:09:38 AM9/26/14
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It's very estrange, we tested yesterday the same situation on a virtualbox newly installed and it seems to be working just with the ppa:kurento/kurento

Let's try to find a different cause of error. Could you please try this and tell me the result?

sudo apt-get install gstreamer1.0-tools
rm ~/.cache/gstreamer-1.0/registry.*.bin
gst-inspect-1.0 kmselements

Stefan Hellkvist

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Sep 26, 2014, 10:33:19 AM9/26/14
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Some more light on this issue. 

I did say that I had not installed kurento on these two machines before which is true, but it turns out that they were not entirely pure when it came to gstreamer. Both machines had a different version of gstreamer installed (one from the gstreamer dev-ppa) prior to installation of kurento. I do not know exactly why but I think this is causing the problem somehow for the kurento server even though I suspect it should have its own dependency to particular gstreamer libraries. 

Anyway, I tried on a third machine now - one that had not been used with any version of gstreamer before at all, and then it works fine. 


So there is some gstreamer collision here. That seems to be the issue. 

/Stefan



...

Stefan Hellkvist

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Oct 1, 2014, 2:09:35 AM10/1/14
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I'm thinking now that we should change our debian package to depend on exact gstreamer version to avoid this problems in the future.


Yes, that is probably a good solution to consider for this problem. 

 
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Jose Antonio Santos Cadenas

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Sep 29, 2014, 3:20:51 AM9/29/14
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Glad you could solve your problems, thanks you for the report.

We are depending on a very specific gstreamer version, other versions have not been tested and  , we are distributing our packets, that essentially are the same as gstreamer official packages but with some bugs solved that are not accepted in the version we are depending on. We try to be as most synced with latest gstreamer version as we can, but sometimes we have a little bit delay depending on work load we have.

I'm thinking now that we should change our debian package to depend on exact gstreamer version to avoid this problems in the future.

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