[Asterisk-video] about h324m codec negotiate

[Ethan Liu]

Hi Sergio,

 

I'm sorry to trouble you, but I have some question about h324m protocol.

 

The SIP phone cannot get video when I use h.263 codec bridged SIP and 3G calls.

 

And I checked the problem that it seems “create_ast_frame” function only use h.263plus codec by default.

 

“send->subclass = AST_FORMAT_H263_PLUS | mark;”

 

I try modify that codec to h.263 only, but it’s failed. There are two question:

 

1.    Can I use libh324m negotiate codec with 3G phone use h.263 only? 

I saw that it seems can negotiate h.263 or h.263 version 3(h.263++/h.263 2000), but how to negotiate h.263 1996 or h.263 plus(h.263 1998)?

2.    How can I translate from h.263 plus to h.263 ? it seems only has different heard, right?

 

Wait for your suggestion. Thank you.

 

Ethan

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