[Asterisk-video] app transcoder

Mon Nov 2 22:48:25 CST 2009

Hi Sergio
Thanks for the reply. app transcoder only supports h263p. I have a small
doubt; please correct me if I am wrong.
Consider the following use case:

Xlite is configured with h263-1996
Linphone is configured with h263p.
Xlite is placing call to linphone.
So ; the codec between xlite and asterisk is h263-1996; and between asterisk
and linphone is h263p.
App transcoder will convert incoming h263-1996 packets into h263p.So i can
expect xlite will be able to send video to linphone.
Now my confusion is :
Will app transcoder also convert incoming h263 packets from linphone to
h263-1996?
Othewise it is not possible to send video from linphone to xlite.

Since app transcoder supports h263p; if i keep codecs in both the phones
h263p; video will appear in both the phone. But then. i do not really need
app transcoder; asterisk is capable of doing it without app transcoder.
It seems app_transcoder only supports oneway video; Because if we use
transcoding between h263p and other codecs ( say mpeg/h263/h261);
app_transcoder will be able to encode other codecs to h263p but it will not
be able to do the opposite; and we will only see one way video.

By the way ; what are the codecs are supported by libavcodec and asterisk?
I am interested in :
h261
h263
h263p
h264
mpeg-4

Thanks and regards
Anand

2009/11/3 Sergio Garcia Murillo <sergio.garcia at fontventa.com>

>  Hi anandapip,
>
> app_transcoder only supports encoding in h263-1998/2000 (h263p), not in
> h263-1996.
>
>
> Best regards
> Sergio
>
> anandadip mandal escribió:
>
> Hi Sergio
> Thanks for the reply.
> There was a problem in my ffmpeg (livavcodec) which was not buit with
> videocodec support.I have replaced it and now not getting the error.
> But a strange problem I am facing now.
> I have tried transcoding between h263 and h263+.I have used Xlite and
> linphone.
> I am calling from linphone which is using h263-1998 codec; App transcoder
> encodes the incoming h263-1998 to h263 and places call to xlite. It is
> also evident from the sip signalling traces that codec between asterisk and
> linphone is h263-1998 and between asterisk and xlite is h263.But if i
> configure xlite only for h263 ; no video is apperaing. But if i keep codec
> in xlite h263-1998 (i.e h263+) video appears.
> I am not sure if app_transcode module is really encoding in h263 format
> thogh log says it is encoding.
>
> Thanks and regards
> Anand
>
>
>
> On 02/11/2009, Sergio Garcia Murillo <sergio.garcia at fontventa.com> wrote:
>>
>> Hi anandadip
>>
>> Get the core dump and a back trace of asterisk when it seg faults
>>
>> Best regards
>> Sergio
>>
>> anandadip mandal escribió:
>>
>>  Hi
>> I want to make video call between two sip phone having different video
>> codecs using app_transcoder.
>> I have used the following dialplan
>> [default]
>> exten => 101,1,Answer
>> exten => 101,2,transcode(,102 at default,h263 at qcif
>> /fps=12/kb=52/qmin=4/qmax=12/gs=50)
>> exten => 102,1,Dial(SIP/101)
>>
>> the 102 ( having h263-1998 codec) extension is calling 101 (having h263
>> codec).
>> I can see the call between the two phone established but no video; also i
>> dont see any ack coming from 101 and within seconds asterisk gives a
>> segfault.
>> Without app transcoder, video call works fine when both phone use
>> h263-1998 codec.
>> I am using asterisk 1.4; the transcode module loads succesfully; even it
>> executes and places a call to the configured extension)
>>
>> Please help me if i am using the correct dialplan or am i missing
>> something.
>>
>> Any help will be much appreciated.
>>
>> Regards
>> Anand
>>
>>
>>
>> On 26/10/2009, anandadip mandal <anandadip at gmail.com> wrote:
>>>
>>> Hi
>>> I have successfully compiled and able to load the app_transcoder.so;
>>> I want to know the configuration of  extension.conf to put the
>>> app_transcoder in use.
>>> I have two sip soft phone(video capable) 3000, 3001 which are already
>>> registered to asterisk and I can make audio call  between them;
>>> Also please let me know if i have to add anything specific to
>>> extesion.conf and sip.conf  for enabling  video call.
>>> Any help will be very much appreciated.
>>> Thanks and regards
>>> Anand
>>>
>>>
>>> 2009/10/20 anandadip mandal <anandadip at gmail.com>
>>>
>>>> is there any document for compilation procedure of app transcoder?also
>>>> could someone point me how to integrate it with asterisk?
>>>> Thanks
>>>> Anand
>>>>
>>>>
>>>
>>>
>>> --
>>> Anandadip Mandal
>>>
>>
>>
>>
>> --
>> Anandadip Mandal
>>
>> ------------------------------
>>
>>
>> _______________________________________________
>> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>>
>> asterisk-video mailing list
>> To UNSUBSCRIBE or update options visit:
>>    http://lists.digium.com/mailman/listinfo/asterisk-video
>>
>>
>>
>>
>> _______________________________________________
>> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>>
>> asterisk-video mailing list
>> To UNSUBSCRIBE or update options visit:
>>   http://lists.digium.com/mailman/listinfo/asterisk-video
>>
>
>
>
> --
> Anandadip Mandal
>
> ------------------------------
>
> _______________________________________________
> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>
> asterisk-video mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-video
>
>
>
> _______________________________________________
> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>
> asterisk-video mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-video
>

-- 
Anandadip Mandal
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-video/attachments/20091103/c0bf4464/attachment-0001.htm 