[Asterisk-video] h324m_loopback no audio problem

[Klaus Darilion]

QQ D wrote:
> Another 
> question
> is that what is the difference between h324m_loopback and the 
> video_loopback
> function?



video_loopback
==============
is a loopback function at AST_FRAME layer - just like Echo().

[h324m]
exten => 123,1,h324m_gw(1 at pseudo)

[pseudo]
exten => 1,1,Answer()
exten => 1,2,video_loopback()


The h324m_gw will translate the H324 frames into Asterisk frames. Then, 
this frames can be handled by any Asterisk application. Thus, 
video_loopback is similar to Echo() but handles only video.

The second difference to Echo() is that Echo() crashes Asterisk :-(




h324m_loopback
==============
is a function on H324M-frames layer:

[h324m]
exten => 123,1,Answer()
exten => 123,2,h324m_loopback(1 at pseudo)

It reads H.223 frames from the ZAP (or misdn) channel and feeds it into 
the H324-library. When the H324M library outputs video or voice frames 
(these frames are not comparable with AST_FRAMEs) they will be just sent 
back to the H324M-library. This will result in H223 frames output by the 
H324M-library which will be written to the ZAP channel.


@Sergio: please correct me if I'm wrong

regards
klaus