Ashwani Should be there http://packages.ubuntu.com/natty/libavcodec-dev sudo apt-get install libavcodec-dev On the lines just below the lines you posted should say this. dyna.cxx(141) DYNA Successfully loaded 'libavcodec.so' dyna.cxx(411) H264 DYNA Successfully loaded libavcodec library and verified functions h264-x264.cxx(1415) H264 Codec Enabled Simon From: Ashwani Kumar [mailto:ash1412@gmail.com] Sent: 10 November 2011 21:43 To: Simon Horne Cc: h323plus@lists.packetizer.com Subject: Re: [h323plus] ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper Thanks Simon, ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper has removed now but facing dyna.cxx(130) DYNA Error loading avcodec-52.so - avcodec-52.so: cannot open shared object file: No such file or directory dyna.cxx(130) DYNA Error loading ./avcodec-52.so - ./avcodec-52.so: cannot open shared object file: No such file or directory dyna.cxx(130) DYNA Error loading /usr/local/lib/avcodec-52.so - /usr/local/lib/avcodec-52.so: cannot open shared object file: No such file or directory dyna.cxx(130) DYNA Error loading avcodec-51.so - avcodec-51.so: cannot open shared object file: No such file or directory dyna.cxx(130) DYNA Error loading ./avcodec-51.so - ./avcodec-51.so: cannot open shared object file: No such file or directory dyna.cxx(130) DYNA Error loading /usr/local/lib/avcodec-51.so - /usr/local/lib/avcodec-51.so: cannot open shared object file: No such file or directory I have installed the "libavcodec-dev" library but not getting above ".so". Regards, Ashwani On Thu, Nov 10, 2011 at 3:55 PM, Simon Horne <s.horne@packetizer.com> wrote: Ashwani By enabling this before calling simple. export PTLIB_TRACE_CODECS=4 You should see this. h264pipe_unix.cxx(305) H264 IPC PP: Couldn't find GPL process executable in /usr/local/lib/codecs/video/h264_video_pwplugin_helper h264pipe_unix.cxx(305) H264 IPC PP: Couldn't find GPL process executable in /usr/lib/codecs/video/h264_video_pwplugin_helper h264pipe_unix.cxx(305) H264 IPC PP: Couldn't find GPL process executable in /usr/local/lib/codecs/video/h264_video_pwplugin_helper h264pipe_unix.cxx(309) H264 IPC PP: Found GPL process executable in ../codecs/video/h264_video_pwplugin_helper If you make install on the h323plus/plugins directory it should be detected. Just make sure it is in one of the above directories. Simon From: h323plus-bounces@lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Ashwani Kumar Sent: 10 November 2011 19:58 To: Simon Horne Cc: h323plus@lists.packetizer.com Subject: Re: [h323plus] ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper Hi Simon, Thanks for your reply. I set environmental variable "PTLIB_TRACE_CODECS=4" and copied "h264_video_pwplugin_helper" in "samples/simple/obj_linux_x86" dir but still getting same error: ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper and also I am not able to see the directories the plugin searches for the X264 helper. Regards, Ashwani On Thu, Nov 10, 2011 at 3:13 PM, Simon Horne <s.horne@packetizer.com> wrote: Enable environmental variable PTLIB_TRACE_CODECS=4 When running simple you will be able see the directories the plugin searches for the X264 helper. The helper should be compiled with the x264 plugin. Simon From: h323plus-bounces@lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Ashwani Kumar Sent: 10 November 2011 16:20 To: h323plus@lists.packetizer.com Subject: [h323plus] ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper Hi All, I have complied H323 plus on my x86 platform running ubuntu 10.04. When I am using simph323 application to make audio & video call, application getting hang. below is the last lines of log message: Receiving side: Waiting for incoming calls for "ashwani" Press X to exit. H323> ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper Incoming call from "caller [192.1.4.1]", answer call (Y/n)? Y Started logical channel: sending G.711-ALaw-64k <1> Started logical channel: receiving G.711-ALaw-64k <1> Sending side: Initiating call to "ashwani@192.1.4.1:6000" Press X to exit. H323> ERROR: H.264 plugin couldn't find GPL process executable: h264_video_pwplugin_helper "ashwani" did not answer your call please find pointer to solve the problem. Thanks in Advance Ashwani