[Asterisk-video] app_transcoder and videocalls

[João Serra]

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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