[Asterisk-video] How to convert mp4save saved video
Sergio Garcia Murillo
sergio.garcia at fontventa.com
Mon Nov 3 15:40:41 CST 2008
Hi Borja,
I don't like the "mp4a" on the atom name, but as the MP4AddAudioTrack
creates automatically the rest of the atoms inside mp4a.. uuf.. I think
that it's the quickest way to solve it.
Perhaps the best way should be rewritting theMP4AddAudioTrack removing
the "mp4a" references and creating everythin under "alaw" or "ulaw" and
also setting the 4th property of the sound atom ("channels") to the
correct value.
Best regards
Sergio
Borja SIXTO escribió:
> Hi Sergio,
>
> I have found a partial work around by adding some track information (for
> the alaw is the same) :
>
> /* Create audio track */
> audio = MP4AddAudioTrack(mp4, 8000, 0,
> MP4_ULAW_AUDIO_TYPE);
> MP4SetTrackIntegerProperty(mp4, audio,
> "mdia.minf.stbl.stsd.mp4a.channels", 1);
> MP4SetTrackIntegerProperty(mp4, audio,
> "mdia.minf.stbl.stsd.mp4a.sampleSize", 8);
> /* Create audio hint track */
> hintAudio = MP4AddHintTrack(mp4, audio);
> /* Set payload type for hint track */
> type = 0;
> audio_payload = 0;
> MP4SetHintTrackRtpPayload(mp4, hintAudio, "PCMU",
> &type, 0, NULL, 1, 0);
>
> But you need to set -acodec pcm_mulaw before the -i ffmpeg option.
>
> Just an other pending modification.
> We can add some informations in the recorded file like that (I am adding
> this modification) :
> #ifndef i6net
> MP4SetMetadataTool(mp4, "app_mp4");
> MP4SetMetadataWriter(mp4,"Called service");
> MP4SetMetadataArtist(mp4,"Caller");
> MP4SetMetadataAlbum(mp4,"Album");
> MP4SetMetadataName(mp4,"13/10 13h40");
> MP4SetMetadataYear(mp4,"2008");
> #endif
>
> Regards,
>
>
> Borja
>
>
> Sergio Garcia Murillo a écrit :
>
>> That's the problem:
>>
>> Stream #0.0(eng): Audio: pcm_mulaw, 8000 Hz, *_stereo, 128 kb/s_*
>>
>> I'll check if we set it wrong to stereo or it's ffmpeg the one that's
>> it's decoding it worng.
>>
>> BR
>> Sergio
>>
>> Silvio Sisto escribió:
>>
>>> I was able to stream some video from x-lite to asterisk and save it
>>> using the mp4save application. Codecs used were g711 and h263.
>>> When I tried to convert the file to other formats using ffmpeg, the
>>> audio track had it's length reduced to a half. Sounds kinda like
>>> squirrels talking :)
>>> It seems that ffmpeg thinks the original file's audio track has 128
>>> kbps instead of 64 (as mp4info correctly recognizes it). I'm guessing
>>> ffmpeg doesn't support g711. Upon further investigation it seems that
>>> none of x-lite's codecs are supported by ffmpeg.
>>> Is there a way to make asterisk convert the audio stream to anther
>>> codec before mp4_save records it?
>>> Thanks,
>>> Silvio Sisto
>>>
>>> This is the content of the original (mp4save) file according to mp4info:
>>> ----------------------------------------------------------
>>> mp4info version 1.5.0.1 <http://1.5.0.1>
>>> test2.mp4:
>>> Track Type Info
>>> 1 audio G.711 uLaw, 11.120 secs, 64 kbps, 8000 Hz
>>> 2 hint Payload PCMU for track 1
>>> 3 video Unknown, 10.856 secs, 0 kbps, 0x0 @ 11.33 fps
>>> 4 hint Payload H263 for track 3
>>> mp4info: symbol lookup error: mp4info: undefined symbol:
>>> MP4GetMetadataGrouping
>>> ----------------------------------------------------------
>>>
>>> # ffmpeg -i test2.mp4 -f flv video2.flv
>>> OUTPUT:
>>> ----------------------------------------------------------
>>> FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2004 Fabrice Bellard
>>> configuration: --enable-gpl --enable-pp --enable-mp3lame
>>> --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb
>>> --enable-shared
>>> libavutil version: 49.0.0
>>> libavcodec version: 51.11.0
>>> libavformat version: 50.5.0
>>> built on Oct 10 2008 16:54:46, gcc: 4.1.2 20061115 (prerelease)
>>> (Debian 4.1.1-21)
>>>
>>> Seems that stream 2 comes from film source: 1000.00 (90000/90) ->
>>> 19.00 (19/1)
>>> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test2.mp4':
>>> Duration: 00:00:11.1, start: 0.000000, bitrate: 92 kb/s
>>> Stream #0.0(eng): Audio: pcm_mulaw, 8000 Hz, stereo, 128 kb/s
>>> Stream #0.1(eng): Data: rtp / 0x20707472
>>> Stream #0.2(eng): Video: h263, yuv420p, 176x144, 19.00 fps(r)
>>> Stream #0.3(eng): Data: rtp / 0x20707472
>>> Output #0, flv, to 'video2.flv':
>>> Stream #0.0: Video: flv, yuv420p, 176x144, q=2-31, 200 kb/s, 19.00
>>> fps(c)
>>> Stream #0.1: Audio: mp3, 8000 Hz, stereo, 64 kb/s
>>> Stream mapping:
>>> Stream #0.2 -> #0.0
>>> Stream #0.0 -> #0.1
>>> Press [q] to stop encoding
>>> [h263 @ 0xb7e00468]warning: first frame is no keyframe
>>> [mp3 @ 0xb7e00468]lame: output buffer too small (buffer index: 321,
>>> free bytes: 1983)
>>> frame= 206 q=2.0 Lsize= 87kB time=5.4 bitrate= 131.4kbits/s
>>> video:30kB audio:42kB global headers:0kB muxing overhead 20.380929%
>>> ----------------------------------------------------------
>>>
>>> ------------------------------------------------------------------------
>>>
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>> ------------------------------------------------------------------------
>>
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>
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