[Asterisk-video] app transcoder

Tue Nov 3 09:47:10 CST 2009

Hi sergio

I am not sure if i am using correct dialplan.
I want to transcode between two sip phone ; one is using mpeg4 and the other
one h263p.
my 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)

102(mpeg4)  is calling 101(h263p).

Do i need to use any other module say app_rtsp?
Please suggest the correct dialplan.

Regards
Anand

On 03/11/2009, anandadip mandal <anandadip at gmail.com> wrote:
>
> 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
>>>
>>> ------------------------------
>>>
>>>
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>>
>>
>>
>> --
>> Anandadip Mandal
>>
>> ------------------------------
>>
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>>
>> _______________________________________________
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>
>
>
> --
> Anandadip Mandal
>

-- 
Anandadip Mandal
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