[Asterisk-video] app_mp4 fixed video playback

[Klaus Darilion]

Sergio Garcia schrieb:
> 
> I think that the asterisk frame payload should be AMR TRP (rfc3267
> octecte-aligned mode)

That would mean:

   the Payload Header (1 byte with the CMR) +
   the Payload Table of Contents (x bytes with the frame type) +
   the speech data (x or less AMR frames)

Thus, it would allow to carry multiple AMR frames in a singe ast_frame.
Is this correct?

> that is the mode used in streaming.  Francesco did a great work on
> that, but I don't know what is he on latelly..
> 
> By the way, I think that an asterisk patch for AMR passthrough
> support is also needed, Olle do u think it could be committed into
> the main code if we make it?

What is needed for that? I think adding the AMR type and extending the 
RTP code to make RTP packets out of the AMR ast_frames (and vice versa) 
should be enough.

regards
klaus

> 
> 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, 31 Aug 2007
> 09:18:33 +0200
> 
>> btw: how is the format for AMR inside ast_frame?
>> 
>> like in RTP: 1 byte CMR + x bytes ToC (frame type) + AMR payloads
>> 
>> or like in AMR file: 1 byte header (frame type) + AMR frame
>> 
>> or something completely different?
>> 
>> IMO this should be defined and written down somewhere.
>> 
>> regards klaus
>> 
>> Sergio Garcia schrieb:
>>> Could anyone check which is the current suppor for amr in
>>> openwengo? It would be great to have some reference client for
>>> testing independently the app_h324m and app_mp4. I'll take a look
>>> also to it, but i have to study in depth the amr specsm, because
>>> i don't remmember anything.. :)
>>> 
>>> BR 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, 31 Aug 2007
>>> 08:45:37 +0200
>>> 
>>>> Klaus Darilion schrieb:
>>>>> Klaus Darilion schrieb:
>>>>>> Sergio Garcia schrieb:
>>>>>>> There was an error calculating the delay between frames,
>>>>>>> been always 0. Now the video should be smooth again.
>>>>>> Playing back the recorded video (from nokia 6630): with
>>>>>> VLC: no audio; video works
>>>>> I inspected the 3gp file (and an extracted AMR file) and the
>>>>> AMR frames mode 7 are only 15 bytes instead of 16 bytes. More
>>>>> debugging tomorrow.
>>>> uups - I meant 31 instead of 32 bytes.
>>>> 
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