[Asterisk-video] app_transcoder and videocalls

[João Serra]

But why needs asterisk itself modifications to support mjpeg ? And
where exactly?



On Thu, Sep 2, 2010 at 15:37, Sergio Garcia Murillo
<sergio.garcia at fontventa.com> wrote:
>  I am using x264 through ffmpeg so I cannot assure everything is set up
> exactly the same, but the latency is good anyway.
>
> In the MCU server I did integrate the x264 directly and set up the
> zerolatency and some other parameters directly.
>
> Best regards
> Sergio
>
> El 02/09/2010 16:22, João Serra escribió:
>> Hi Sergio, thanks for your reply.
>>
>> Why needs asterisk modifications? And Where exactly on the source?
>> In the case of h264 encoding, does app_transcoder use the new
>> real-time features/options present in new versions of
>> x264(http://x264dev.multimedia.cx/?p=249)
>>
>> Thanks.
>>
>>
>> On Thu, Sep 2, 2010 at 14:26, Sergio Garcia Murillo
>> <sergio.garcia at fontventa.com>  wrote:
>>>   El 21/08/2010 0:24, João Serra escribió:
>>>> Hi, currently playing with SofiaSIP library and i'm thinking in coding
>>>> a video capable(via gstreamer) SIP UA for a Linux STB connected to a
>>>> USB Webcam.
>>>> However, all consumer-level webcams output only MJPEG video and i
>>>> cannot afford to do any kind of video transcoding on the STB
>>>> itself(the STB has a 300mhz mips cpu)
>>>>
>>>> So, can i use Asterisk with app_transcoder to transcode mjpeg
>>>> videocalls to/from h263 or h264. Also, what delay will app_transcoder
>>>> introduce?
>>>>
>>>> Thanks.
>>>>
>>> Hi Joao,
>>>
>>> Currently app_transcoder does not support mjpeg decoder, it could
>>> support it easily, but you would also need to patch asterisk to support it.
>>> The delay introduced by the app_transcoder is minumun, jsut the cpu time
>>> needed to decode and re-encode the frame, so it varies depending on the
>>> video codec, cpu and size of the frame.
>>>
>>> Best regards
>>> Sergio
>>>
>>>
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>
>
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