[Asterisk-video] app transcoder

Tue Nov 10 01:44:34 CST 2009

Hi Sergio

I am using app_rtsp, app_transcoder,linphone and vlc .

My dialplan is
[default]
exten => 101,1,Answer
exten => 101,2,transcode(,s at camera,h263 at qcif
/fps=12/kb=52/qmin=4/qmax=12/gs=50)
[camera]
exten => s,1,Answer
exten => s,2,rtsp(rtsp://192.168.1.3:1234/stream.sdp)
exten => s,3,Hangup

I have opened the rtsp stream using vlc.
I can play the stream using vlc client.

I am dialing 101 from linphone and app_rtsp properly connects to vlc server.
I can see the describe, setup, play messages in ethereal.
Now the problem is, app_transcoder is unable to decode the incoming h264 or
mpeg4 stream from vlc server.
I have gone through the traces; it says app_transcoder is able to find the
decoder; but it fails while decoding the frames.
app_transcoder is throwing the message while exceuting
avcodec_decode_video();
In case of h264; it is "no frame"
In case of mpeg4 ; it is "invalid picture size".

I am feeding transcoded frames using vlc server.
i.e the picture captured from camera is transcoded in h264 or mpeg4.
I have even tried with mpg files. but same result.

Is It related to the libavcodec library i am using?
But the library is able to open the decoders.

Regards
Anand

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

> Hi anand
>
> As I said before, app transcoder can only currently encode in h263p, so you
> are not going to be able to do it.
> The application main pourpose was as a complment to the h324m library (to
> adjust the video bitrate from the videophone) and to use the video from a
> network camera in asterisk with app_rtsp.
>
>
> Best regards
> Sergio
>
> anandadip mandal escribió:
>
> 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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>>
>>
>>
>> --
>> Anandadip Mandal
>>
>
>
>
> --
> Anandadip Mandal
>
> ------------------------------
>
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-- 
Anandadip Mandal
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