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by ghyhust 07 Jan '11

07 Jan '11

2011-01-07 ghyhust

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h323plus and video codecs
by Vladimir Fekete 07 Jan '11

07 Jan '11

Hello all, I'd like to ask you for help/hint about video codecs in h323plus (v1.22). Since I'm new I'm not sure I understand everything correctly. What I want to do : I don't have a camera, but I'd like to be able to send some video through the net (between/using 2 MyPhone applications as endpoints). Thanks to other tutorials I was able to rewrite the OpenAudioChannel, so I was able to transmit wav file. I hoped it will be equally "easy" for the video. Unfortunately, for MyPhone application, execution did not even entered the OpenVideoChannel method. So I looked at the capabilities of my end point and there are no video codecs. So, I'd like to ask you: Are the missing video codes my only problem ? (e.g. do I understand it correctly, that I only need to rewrite OpenVideoChannel in order to read from a file/stream ?) Are video codecs in h323plus represented as plugins only or there should be some internal ones which works ? Could ffmpeg plugin for h323 help me ? I tried to compile ffmpeg plugin and use it. Compilation went fine (I get the dll and 2 header files), so I tried to use it. Unfortunately due to lack of documentation (other than code itself) I was able to find only classes as OpalDynaCodecDLL from dynacodec.h which seemed to do the job (to allow me to add h.263 capability and add video codec). However there is dllcodec.h file missing in whole h323plus project (I was able to trace it down in openh323 which is obsolete afaik) and also some classes were missing (such as OpalDLLCodecInfo). I tried to download the OPAL project source codes, but I was not able to find dllcodec.h. any hint will be appreciated. Best regards, Vladimir

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Facility transportedInformation vs empty
by Mark Fawcett 06 Jan '11

06 Jan '11

All, When running h323plus against various endpoints, h323plus always seems to use the Facility + empty h323-message-body method of sending messages (such as an H245 MSD) as opposed to the transportedInformation Facility method. (At least according to Wireshark.) I'm running h323plus reporting a protocol identifier of 0.0.8.2250.0.6 (Version 6). I've tested against endpoints running V4 (so I would potentially expect a drop down to the older style of working) and ones reporting themselves as V6. Question: Is there a way in h323plus to make use of the transportedInformation style of facility message indication? I've dug around the source code and can see the enum type declared but can't see anywhere that necessarily makes use of it (not to say the late night is causing brain fade). Cheers Mark Mark Fawcett Managing Director +44 (0)7976 240171 (M) +44 (0)8454 336886 (x1001) (L) www.noakesltd.co.uk Noakes Limited, Registration #06920566 (England & Wales), 2 Berkeley Close, Northampton, NN1 5BJ

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GNU Gatekeeper release 2.3.4
by Jan Willamowius 04 Jan '11

04 Jan '11

Hi all, the GNU Gatekeeper version 2.3.4 has been released. http://www.gnugk.org/gnugk-2-3-4.html This is mainly a bugfix release for proxy mode selection, H.460.18/.19 and bandwidth management. Regards, Jan -- Jan Willamowius, Founder of the GNU Gatekeeper Project EMail : jan(a)willamowius.de Website: http://www.gnugk.org Support: http://www.willamowius.de/gnugk-support.html Changes from 2.3.3 to 2.3.4 =========================== - BUGFIX(Toolkit.cxx) fix handling of ModeSelection rules (sponsored by Charite, Berlin) - BUGFIX(RasSrv.cxx) fix handling of BRQs reducing the bandwidth - BUGFIX(ProxyChannel.cxx) fix H.239 from H.460.19 client (sponsored by Nanjing Southern Telecom) - BUGFIX(ProxyChannel.cxx) fix H.245 IP in H.460.18 call - BUGFIX(ProxyChannel.cxx) sourceCallSignalAddr rewrite and RemoveH235Call= were ignored when calling endpoint who uses H.460.18 - BUGFIX(gksql_mysql.cxx) set MySQL connect timeout to 10 seconds (was 10000 seconds) - BUGFIX(RasTbl.cxx) add NULL pointer checks when searching for endpoints - BUGFIX(yasocket.cxx) fix crash on Windows service shutdown - BUGFIX rewrite memory mangement for routeToAlias - BUGFIX(RasSrv.cxx) allow calls with zero bandwidth - BUGFIX(ProxyChannel.cxx) fix crash when call being retried is deleted by another thread - BUGFIX(ProxyChannel.cxx) fix crash in RTCP handling - new switch: [Proxy]EnableRTCPStats=, must be enabled to send RTCP stats to Radius server - new switch: [EP::...]AdditionalDestinationAlias= - new switch: [RoutedMode]AlwaysRewriteSourceCallSignalAddress=, defaults to 2.3.2 behavior - convert 2nd CallProceeding even if the first was sent through the status port

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Re: [h323plus] enabling DirectShow video input
by Alessandro Angeli 05 Dec '10

05 Dec '10

From: "Alessandro Angeli" <packetizer.com(a)riseoftheants.com> Date: Tuesday 02 November 2010 18:26 > It seems to (almost) work now. Both endpoints see the webcams and both > load the Vic H.261 plugin (but not the ffmpeg H.263 one). However, the > server side (-n -l) only receives the video while the client side (-n > <host>) neither sends not receives. Audio and text are fine. I figured it out. The value of CLSID_SampleGrabber in vidinput_directx2.cxx is wrong (copied&pasted from CLSID_NullRenderer): Data1 should be 0xC1F400A0 and not 0xC1F400A4. -- Alessandro

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Bandwidth Control during conference
by kc ooi 26 Nov '10

26 Nov '10

Dear all h323plus member, Is there any function that allow for bandwidth changing during conference undergoing? For example, if I initial a conference with bandwidth 768kbits, I want to limit my bandwidth to 512kbits during conference. How I can do this? Thanks.

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Transfer call
by Igor Pavlov 14 Nov '10

14 Nov '10

Hi, I am using H323Connection::TransferCall() and capture network packets with Wireshark, so when transfering the call in wireshark I see Malformed Packet ( CS : empty [Malformed Packet] ) The problem in these strings (in h450pdu.cxx in function H450ServiceAPDU::BuildCallTransferInitiate()) invoke.IncludeOptionalField(X880_Invoke::e_argument); invoke.m_argument.EncodeSubType(argument); If I comment these strings then I see just CS : Empty. And of course have no transfer of call. I have some questions : 1. Who is wrong ? h323plus or Wireshark 2. How do deternine if remote h323 client support transfering call ? Because I have Tandberg T-1000 wich is not reacting on my transfer call response, maybe because of malformed packet or because it does not support it at all Thank you, Igor Pavlov.

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Re: [h323plus] enabling DirectShow video input
by Alessandro Angeli 02 Nov '10

02 Nov '10

From: "Robert Jongbloed" <robert.jongbloed(a)bigpond.com> Date: Tuesday 02 November 2010 19:17 >> The "Linker/General/Output File" of "SVN Get Revision" is now set to >> >> $(SolutionDir)/svn_getrev.exe >> >> which creates a invalid path: the / should be removed or at least >> replaced with a \. > > While I find it strange that this has worked for me for I do not know > how long, I never had this problem before either, but it makes sense: $(SolutionDir) ends in \ and that path would use a \/ sequence. The filesystem (at least on Win7/x64) is able to cope with /, \\ or // beside the correct \, but not (understandably) \/ or /\. -- Alessandro

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enabling DirectShow video input
by Alessandro Angeli 02 Nov '10

02 Nov '10

I successfully built the debug configurations of ptlib 2.4.5 (static), h323plus 1.21.0 and simpleplus 1.21.0 in VS2008SP1 + WinSDK 7.1 on Win7/x64. Audio and text work fine. However, video does not work: "No Video Grabber available Disabling Video Support!". DirectShow support in vidinput_directx.cxx is compiled successfully and the DirectShow branches in simpleplus/main.cxx are active, since P_DIRECTSHOW is #define'd as 1 in ptbuildopts.h. I tried #define'ing P_DSHOW to 1 as well in simpleplus, without any difference. As far as I can tell, the problem is that the DirectShow service is never registered on startup. I expanded the PCREATE_VIDINPUT_PLUGIN(DirectShow) macro in vidinput_directx.cxx to put a breakpoint in PPlugin_PVideoInputDevice_DirectShow_Registration::<ctor>() and that code is compiled but never executed. Actually, it appears to never be mapped into memory at all, which should imply that the linker is removing it from the final EXE, but adding /OPT:NOREF in the build config of simpleplus does not make a difference. However FakeVideo is registered and it also uses the PCREATE_VIDINPUT_PLUGIN() macro, and I can not spot any difference between the way FakeVideo and DirectShow are compiled and linked. The only reference to a similar issue I could find is from over one year ago: http://lists.packetizer.com/pipermail/h323plus/2009-August/001165.html But the current code already uses PCREATE_VIDINPUT_PLUGIN() and, as I said, FakeVideo uses the same macro but is correctly registered. -- Alessandro

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calling the OpenVideoChannel function
by Isaac Kazadi 31 Oct '10

31 Oct '10

Hi all, I know there have been a few questions regarding this matter and i've looked throught the mailing list and didn't quite find the answer for it unless i missed it. I've downloaded and compiled ptlib 2.8.1 and the latest h323plus cvs and simpleh323, all seems to work fine except i've noticed that the every overriden functions from h323Endpoint are being called but the OpenVideoChannel/ OpenExtendedVideoChannel functions aren't getting called at all. I've checked and can confirm that H323_VIDEO is already defined, and i've tried tracing where the functions are being referenced, but didn't notice anything wrong. You help/suggestions will be greatly appreciated. Thanks Zhack

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