[Asterisk-video] H263 (NOT H263+) mp4 hinting

[Sergio Garcia]

This are the mappings between the media track codec name and the asterisk formats.

Audio:
"PCMU"->AST_FORMAT_ULAW;
"PCMA"->AST_FORMAT_ALAW;
"AMR"->AST_FORMAT_AMRNB;

Video:
"H263-1996"->AST_FORMAT_H263;
"H263-1998"->AST_FORMAT_H263_PLUS;
"H263-2000"->AST_FORMAT_H263_PLUS;
"H264"->AST_FORMAT_H264;


---------- Original Message ----------------------------------
From: Klaus Darilion <klaus.mailinglists at pernau.at>
Reply-To: Development discussion of video media support in Asterisk<asterisk-video at lists.digium.com>
Date:  Fri, 20 Jul 2007 09:21:47 +0200

>And what is supported by app_mp4?
>
>regards
>klaus
>
>Sergio Garcia wrote:
>> Ok, I'l try to explain it once again (h263 naming is a complete mess).
>> 
>> First, there is no such thing as h263/h263+/h253++ and h263-1996,h263-1998 and h263-2000 are just for rtp pacektization.
>> 
>> There is only one h263, but there has been three revisions of the standard, (1996,1998 and 200) and each revision has just added
>> anexes to it. So what it's usually called h263p is just h263 using some anexes (advanced intra coding, etc) at will.
>> 
>> Another different thing is rtp packetization, h263-1996 is rfc 2190, and h263-1998 and h263-2000 are rfc 2429.
>> 
>> Usually, for videoconferencing h263 is used without anexes. So the same base h263 stream can be pacektized as h263-1996 or
>> h263-1998. In fact converting from h263-1996 to h263-1998/2000 is almost trivial (not the other way round).
>> 
>> Hope it's a bit mor clear now.
>> 
>> Best regards
>> Sergio
>> 
>> 
>> 
>> ---------- Original Message ----------------------------------
>> From: Klaus Darilion <klaus.mailinglists at pernau.at>
>> Reply-To: Development discussion of video media support in Asterisk<asterisk-video at lists.digium.com>
>> Date:  Fri, 20 Jul 2007 01:00:28 +0200
>> 
>>> Manos Megagiannis wrote:
>>>> Mp4creator only generates h263-2000 hints.
>>>> Any similar programs for h263?
>>> To summarize this for beginners like me:
>>> AFAIK h263+ is the same as h263-2000. Correct?
>>> But what is h263? is it h263-1996 or h263-1998?
>>>
>>> AFAIK mp4play and needs hint tracks. Thus, h263 can not be used with 
>>> mp4play due to the lack of generating a h263 hint track?
>>>
>>> What about a h263 video track with a h263-2000 hint track? Is this 
>>> possible? will it work?
>>>
>>> thanks
>>> klaus
>>>
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>>  
>> 
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