[Asterisk-video] Cannot make h324m_gw and mp4save to work (properly)

[Francesco Emmi]

Hi Stefano,

you underlined some known mp4save issues. Essentially audio must be 
converted in amr mime format from if2 coming from mobile and video has 
timing issues due to rtp packetization.
Anyway we are working on, and I think that a new version will be 
committed on svn soon.

Ciao
Francesco

Stefano Lucetti wrote:
> Hello list,
> I have read a few month of list archive, but with no luck.
> As with the subject, I have some problems with making h324m_gw and
> mp4save working properly. Sorry for lengthy mail, but I'm including
> most info as possible...
> My setup is (all built from sources, gcc-4.1):
> * pwlib 1.10.3
> * libh324m from svn (check out revision 107)
>  (commenting out TIFF_bitreverse)
> * ffmpeg from svn (check out revision 9154)
> * mpeg4ip 1.5.0.1
> * Asterisk 1.4.4
> * app_mp4 & app_h324m (+ fixed ast_senddigit in app_h324m)
>
> ISDN card is misdn compatible, fully working in other configurations.
>
> I'm trying to record (using mp4save) 3g video calls from a Nokia 6680.
> Things are (almost) working, but saved mp4 files are messed up...
>
> Relevant part of extensions.conf:
>
> [in]
> exten => _X.,1,h324m_gw(record at mp4video)
>
> [mp4video]
> exten => record,1,Answer
> exten => record,2,mp4save(/tmp/test.mp4)
>
> Calling asterisk is fine: call is routed to h324m_gw, and then saved
> to /tmp/test.mp4
> Call is recognized as AMR audio and H.263+ video (added some printf()
> in mp4_save).
> Up to here, the successful story. The problem is that the test.mp4
> video is not recorded properly. Indeed, video is accelerated, and
> audio is present but not recognized by player (e.g. vlc)
>
> mp4info gives:
>
> test.mp4:
> Track   Type    Info
> 1       audio   AMR, 22.500 secs, 12 kbps, 8000 Hz
> 2       hint    Payload AMR for track 1
> 3       video   H.263, 7.455 secs, 114 kbps, 176x144 @ 23.071764 fps
> 4       hint    Payload H263-1998 for track 3
>
> Call duration was actually around 23 seconds, so timing of video is
> definitely wrong. Indeed,  playout of video is speeded up...
>
> To me, it seems to be some problem during encapsulation of mp4 file,
> since it is possible to correctly recover both audio and video from
> the raw data received (and dumped in /tmp by  ..? )
> As far as video is concerned, if I recode the raw h.263 track
> available in /tmp/media_xxxx.raw using mp4creator -timescale=90000,
> the resulting video is playable with the correct duration.
> The amr audio available in the other raw file in /tmp seems correct
> (amr-nb , IF2 mode) and can be decoded using command line decoder by
> 3gpp.
>
> Any help is greatly appreciated.
> Ciao
> Stefano
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-- 
____________________________________________
Francesco Emmi
A-Tono
Largo Paisiello 5 - 95124 Catania
Tel.: (+39) 095 7365312
http: www.a-tono.com

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