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

[Torben Knerr]

On 12/12/05, PERET Pierre-Hugues <ph.peret at free.fr> 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....


one more guess:
1) is vlc able to successfully encode amr_wb to a file (instead of
streaming) ?
2) if so, can QTPlayer (or any other player) play this file ?
3) if so, then my guess is that vlc does not properly apply the amr_wb
(sawb) encoded content to the rtp stream. That was the reason for amr_nb
(samr) not working when I tried it about 4 months ago. VLC Developers told
me that the packetize_amr (in
https://trac.videolan.org/vlc/file/trunk/modules/stream_out/rtp.c) function
does not work properly. It is described in RFC3267 (
http://www.apps.ietf.org/rfc/rfc3267.html#sec-4) how to implement it. That's
where I gave up...

Maybe some VLC developer can help implement the amr packetizer for rtp?


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* <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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