[streaming] Re: Streaming mp4+AAC to mobile phones

[PERET Pierre-Hugues]

>
>...because the mobile tries to load the stream (instead of telling you 
>that this type of stream is not supported), right? So maybe it is an sdp 
>issue...
>One thing to test if aac is supported at all might be:
>1) encode a video with mp4/aac using vlc
>2) hint the encoded file with mp4box and put it in DSS' streaming dir
>3) access the encoded file directly without using an sdp file (e.g. 
><rtsp://server:port/myfile.mp4>rtsp://server:port/myfile.mp4) to see if 
>aac sound works.
>==> If it does not work, i bet it's the phone not soppurting aac. Then we 
>are sure that there's nothing wrong with the sdp (because it's not 
>involved here) and it's also not the fault of VLC's mp4a packetizer 
>(because this one is not involved when VLC encodes to file)
>==> On the other hand, if it works, then there must be something wrong 
>with either the sdp or the packetize_mp4a method -- or something 
>completely different :-/

I encoded a mp4/aac file, and hinted it with mp4creator , and sound is not 
working. For this one, i think its a DSS issue, because the 
sample_100kbit.mp4 (with aac) doesn't work either with DSS.
I'm trying to find a streaming server that can stream mp4/aac to mobile phones.

>>when playing with the sdp file,i can make my mobile phone loading my aac 
>>stream, but not playing it (player stuck at the end of loading).
>
>Unfortunately I can't test the stream right now, because my current 
>provider does not allow any other traffic than http :(
>
>>looking at the code of the rtp module, i noticed amr / mpa4 sections 
>>seems inappropriate for mobile streaming (looks normal). unfortunatly i'm 
>>not able to implement such thing. Maybe i'm completely wrong ...
>>correct me in this case.
>
>
>
>
>>At 17:48 12/12/2005 +0100, you wrote:
>>>Well,
>>>back again !
>>>streaming amr_wb is the same as amr_nb.. it doesn't play in QTplayer 
>>>because it doesn't have the codecs, but the mobile player seems to 
>>>accept it, but no sound is coming.
>>>switch back to amr_nb and play with the sdp file....
>>>
>>>
>>>At 11:55 12/12/2005 +0100, you wrote:
>>>>I came to the same conclusion as you .
>>>>For now, i'm working on the sdp stuff which i think is the problem. Or 
>>>>it might be the reflector module of DSS (in this case i doubt i could 
>>>>do anything for it).
>>>>
>>>>At 17:02 11/12/2005 -0800, Torben Knerr wrote:
>>>>
>>>>
>>>>>On 12/11/05, PERET Pierre-Hugues 
>>>>><<mailto:ph.peret at free.fr>ph.peret at free.fr> wrote:
>>>>>>Didn't tried with ffmpeg's amr_wb.
>>>>>>trying with http allways make my operator says wrong url, putting the 
>>>>>>full path or not.
>>>>>>
>>>>>>I talked on irc with some guys, and it seems that it's not very 
>>>>>>possible to do what i want , and someone oriented me to helix mobile 
>>>>>>server and mobile encoder, but it's far too expensive....
>>>>>>
>>>>>>as i want to take an already running stream and transcode it to 3gp , 
>>>>>>i think i cannot do that with opensource or free software.
>>>>>
>>>>>I think it is possible with vlc+dss, as soon as the sound issue is 
>>>>>solved. Even though the stream might not be 100% 3gp spec compliant, 
>>>>>it worked (at least with video only).
>>>>>
>>>>>>I noticed that DSS is not able to stream mp4+aac to mobile phone -> 
>>>>>>nokia 6630 , sound is not working, even with the sample which comes 
>>>>>>with the server. Making aac streaming working on the mobile would be 
>>>>>>the solution.(amr is not my preference).
>>>>>
>>>>>I think that's not possible with the 6630, because it can not play aac 
>>>>>streams :(
>>>>>On the other hand DSS _is able_ to stream mp4+aac (as you can see the 
>>>>>stream with different players, such as QT), so imho it is definitely 
>>>>>the mobile, which is _not able_ to play rtsp-streamed aac.
>>>>>But you are right, amr_nb is no solution because it is too crappy... 
>>>>>amr_wb might be okay, even though not as good as aac.
>>>>>
>>>>>>if you know a streaming server that can do that.. pls tell me.
>>>>>>maybe tomorrow i will try amr_wb . i will keep you informed.
>>>>>>
>>>>>>NB : 3gp or mp4 generated by vlc doesn't play on the mobile phone on 
>>>>>>local playback (possibly beacause of the lack of hinted tracks)
>>>>>
>>>>>Right, for local playback you need to hint the files. I used mp4box 
>>>>>for hinting and got it work to play locally with mp4+aac and mp4+amr 
>>>>>(both encoded with vlc). Don't remember if it worked with h263 video 
>>>>>too, but i guess so.
>>>>>
>>>>>Good luck with the amr_wb stuff!
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