[Asterisk-video] Videomixing in MeetMe

[Lorenzo Miniero]

Hi Klaus,

first of all thanks for giving the videomixer a try!

libortp4 must be really updated, since the latest version of oRTP is 
0.13.1, which is the one I'm using. In case you don't find a deb 
package, you can get the source here:

	http://download.savannah.nongnu.org/releases/linphone/ortp/sources/

About FFmpeg, the LIBS variable is probably missing a -lavutil. Try 
adding it after -lavformat. Let me know if it fixes the problem and I'll 
correct it in the package too.

Cheers,
Lorenzo


Klaus Darilion ha scritto:
> Hi Lorenzo!
> 
> I have problems when linking the videomixer:
> 
> cvm_session.o(.text+0x93b): In function `cvm_peer_new':
> /export/darilion/confiance/confiance_videomixer-0.1/cvm_session.c:315: 
> undefined reference to `rtp_session_set_connected_mode'
> /usr/local/lib/libavformat.a(utils.o)(.text+0x2947): In function 
> `av_find_stream_info':
> /export/darilion/confiance/confiance_videomixer-0.1/ffmpeg/libavformat/utils.c:1908: 
> undefined reference to `avcodec_pix_fmt_to_codec_tag'
> /usr/local/lib/libavformat.a(allformats.o)(.text+0x21): In function 
> `av_register_all':
> 
> I use libort4 (from backports.org for debian woody) and
> ffmpeg self-installed from todays SVN trunk.
> 
> Which version of ortp do you use.
> 
> regards
> klaus
> 
> 
> 
> Lorenzo Miniero wrote:
>> Klaus Darilion ha scritto:
>>> Hi Lorenzo!
>>>
>>> How can the VideoMixer be used with Asterisk?
>>>
>>> regards
>>> klaus
>>
>> Hi Klaus,
>>
>> both the videomixers are external elements, which receive commands 
>> through dedicated protocols. The patch which you can get on 
>> http://confiance.sf.net/ enables MeetMe to talk this protocols, and to 
>> bridge the video RTP connections between the users and the active 
>> videomixer.
>>
>> Regards,
>> Lorenzo
>>
>>
>>> Lorenzo Miniero wrote:
>>>> Hi all,
>>>>
>>>> I just uploaded on the CONFIANCE webpage, http://confiance.sf.net/, 
>>>> the patch to enable videomixing and continuous presence in MeetMe. 
>>>> The patch enables such functionality both for our enhanced MeetMe 
>>>> (i.e. video sources are enabled/disabled through BFCP moderation) and 
>>>> for basic MeetMe rooms (the videoswitch console command I uploaded 
>>>> some time ago is used to enable/disable video sources). All the 
>>>> instructions needed to build and configure it are attached with the 
>>>> patch.
>>>>
>>>> To provide such a feature MeetMe can make use of two videomixers:
>>>>
>>>>     * the CONFIANCE VideoMixer we're writing (available on 
>>>> http://confiance.sf.net/);
>>>>     * the VideoMixer Sergio Garcia Murillo is writing (available via 
>>>> svn, svn co http://sip.fontventa.com/svn/mcu, needs xmlrpc-c 1.1).
>>>>
>>>> You can choose which one to use by setting a value in the 
>>>> configuration file. You can even disable them both and still rely on 
>>>> basic videoswitching, if you're not interested in videomixing...
>>>>
>>>> All is work in progress, so both Sergio and I would really appreciate 
>>>> any kind of feedback you'll be able to provide us.
>>>>
>>>> I'll spend two words on my work, and I'll let Sergio speak of his own 
>>>> since I couldn't do it better than him. The CONFIANCE VideoMixer 
>>>> currently provides:
>>>>
>>>>     * adaptive layouts according to how many active video sources are 
>>>> feeding the mix;
>>>>     * continuous presence for up to 8 users (this can be easily 
>>>> enhanced by adding new layouts in the code; if you look at the code, 
>>>> you'll see that creating and modifying layouts is really simple);
>>>>     * a static logo when no video sources are active;
>>>>     * support for H.261, H.263 and H.263+ (QCIF only for the moment).
>>>>
>>>> Currently, only one global layout is available for all users in the 
>>>> same conference, but this will be changed in the future.
>>>>
>>>> We tested it with many softphones, as:
>>>>
>>>>     * Minisip, one the softphone we're enhancing to add XCON support, 
>>>> and which makes use of H.263+ as codec;
>>>>     * another custom client we're writing, making use of H.263 (JMF);
>>>>     * X-Lite 3.0, H.263;
>>>>     * Ekiga stable 2.0.x (H.261).
>>>>
>>>> All work quite fine except Ekiga, since H.261 support in our 
>>>> videomixer is still quite buggy (probaby related to how we handle the 
>>>> H,261 payload header), and sometimes makes Ekiga crash. Any feedback 
>>>> upon this will be more than welcome!
>>>>
>>>>
>>>> If you're interested in knowing something more about the 
>>>> implementation details and/or how the videomixers have been 
>>>> integrated in MeetMe, feel absolutely free to ask.
>>>>
>>>>
>>>> Hope to hear you soon, regards,
>>>> Lorenzo
>>>>
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-- 
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Università degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero at unina.it