[Asterisk-video] mp4save(): different audio and video lengths

[Sven Brandau]

Hi @All,

I'm working on a solution.

I've found that some mobile phones (Moto K3) sending out AMR No-Data
packets, instead of comfort noise frames (AMR-SID). So I replaced the
No-Data packets with the last received AMR-SID frame (file app_h324m.c /
function create_ast_frame). This solution worked fine for me.

The only thing is, that the recording for audio and video starts on a
different time - audio and video is already not synchronized, but only
a few milliseconds. It depends on the mp4save option /V - waiting for the
first I-frame.

I'm already working on this issue and will announce my solution here on the
mailing list.

Regards,
Sven

Low Yu Siang wrote:
> Hi,
> 
> May I know if anyone has solved the recording
> audio/video length problem?
> 
> Tech from i6net wrote :
>> Hi,
>>
>> I am going to work on it.
>>
>> But for the moment, I am qualifying the video 
>> transcoder and the h324m module.
>> The Gateway (SIP -> 3G or 3G -> SIP) configuration
> locks after some secondes or minutes if it use the
> transcoder.
>> 2 ways for the recording :
>> - Replace the silence by generating the AMR datas
> with a audio silence.
>> - Check if we can timestamps correctly the AMR
> packets in the MP4/3GP hinted file.
> 
> 
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Dipl. Ing. Sven Brandau                     Software Systems Architect

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