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

[Borja SIXTO]

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.

Regards,


Tech from i6net



Sven Brandau a écrit :
> Dear All,
>
> is anyone working on this issue? Or have a solution?
>
> Regards,
> Sven
>
>
> Jose M. Recio wrote:
>   
>> Hi, guys,
>>
>> I don't know if that's a known fact, I have discovered that, at least in my
>> systems, mp4save() creates mp4files with different lengths in audio and
>> video tracks (see examples at the end). This means that the audio track in
>> those files is almost useless, as it is totally out of synch with the video
>> ...
>>
>> I think this has something to do with the framesPerSample property in
>> mpeg4ip package, but after messing a bit with the MP4 library I have
>> surrended without fixing it. Have somebody tested or fixed this before?
>>
>> Can you check by yourself if this behaviour also happens in your system?.
>>
>> Thanks,
>> JM
>>
>>
>> ~$  mp4info /tmp/*.mp4
>> mp4info version 1.5.0.1
>> /tmp/save.clock.1.mp4:
>> Track   Type    Info
>> 1       audio   AMR, 6.780 secs, 12 kbps, 8000 Hz
>> 2       hint    Payload AMR for track 1
>> 3       video   H.263, 9.171 secs, 47 kbps, 176x144 @ 8.614110 fps
>> 4       hint    Payload H263-1998 for track 3
>> /tmp/save.clock.2.mp4:
>> Track   Type    Info
>> 1       audio   AMR, 52.460 secs, 12 kbps, 8000 Hz
>> 2       hint    Payload AMR for track 1
>> 3       video   H.263, 61.413 secs, 45 kbps, 176x144 @ 9.069741 fps
>> 4       hint    Payload H263-1998 for track 3
>> /tmp/save.clock.3.mp4:
>> Track   Type    Info
>> 1       audio   AMR, 2.900 secs, 10 kbps, 8000 Hz
>> 2       hint    Payload AMR for track 1
>> 3       video   H.263, 6.649 secs, 49 kbps, 176x144 @ 8.572718 fps
>> 4       hint    Payload H263-1998 for track 3
>> ~$  
>>
>>
>>
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