there's no sound when playing a wma via rtsp

I won't be able to tell the problem just from the build.out
and the
output of splay. But I can give you some things to look at
to determine the problem:

Are audio packets arriving at the client? You'll need to
look at
the RTSP conversation and see what transport is used (TCP
or UDP). Then you'll need to look at a Wireshark capture to
see if the packets are actually arriving at the client.

If you find that the transport is UDP, then I'm guessing
this
is probably a poke-port problem. The WM-RTSP code does
not include code to poke through the NAT. This needs to be
added.

One easy way to test if this is a poke-port problem is to
force the use of TCP. You can do this by changing the
URL scheme to be rtspt:// instead of rtsp:// (the
"t" forces
the use of TCP as opposed to UDP). If rtspt://xxx plays
back and rtsp://xxx won't, then it's most likely a
poke-port
problem.

Eric
=============================================
Eric Hyche (ehychereal.com)
Technical Lead
RealNetworks, Inc.  

> -----Original Message-----
> From: clientapps-dev-bounceshelixcommunity.org 
> [mailto:clientapps-dev-bounceshelixcommunity.org] On
Behalf Of ljun
> Sent: Tuesday, March 11, 2008 5:47 AM
> To: clientapps-devhelixcommunity.org
> Cc: wmcode-protocol-devlists.helixcommunity.org
> Subject: [clientapps-dev] there's no sound when playing
a wma via rtsp
> 
> Hi
> 
>  
> 
>      I have build splay_wm using vc7 and successfully.
But 
> when I tried to play a wma file via rtsp, there’s no
sound. 
> This file can be played and heard using realplayer 11
for 
> Windows and Windows media player. The attachment is my

> build.out and play log. What’s the problem?
> 
>  
> 
> Link:
rtsp://kt68kmssst.dosirak.com/QP/3/54749622/54749622_192K.wm
a 
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Best regards
> 
>  
> 
> Eric Li (李军)
> 
>  
> 
> www.realnetworks.com
> 
>  
> 
> 


_______________________________________________
Clientapps-dev mailing list
Clientapps-devhelixcommunity.org
http://lists.helixcommunity.org/mailman/listinfo/
clientapps-dev

It's a poke-port problem. After using rtspt:// instead of
rtsp://, the sound is
OK.

Many thanks, Eric. 

 
Best regards
 
Eric Li (李军)
 
www.realnetworks.com
> -----Original Message-----
> From: Eric Hyche [mailto:ehychereal.com]
> Sent: Tuesday, March 11, 2008 9:15 PM
> To: ljunreal.com; clientapps-devhelixcommunity.org
> Cc: wmcode-protocol-devlists.helixcommunity.org
> Subject: RE: [clientapps-dev] there's no sound when
playing a wma via rtsp
> 
> 
> I won't be able to tell the problem just from the
build.out and the
> output of splay. But I can give you some things to look
at
> to determine the problem:
> 
> Are audio packets arriving at the client? You'll need
to look at
> the RTSP conversation and see what transport is used
(TCP
> or UDP). Then you'll need to look at a Wireshark
capture to
> see if the packets are actually arriving at the
client.
> 
> If you find that the transport is UDP, then I'm
guessing this
> is probably a poke-port problem. The WM-RTSP code does
> not include code to poke through the NAT. This needs to
be
> added.
> 
> One easy way to test if this is a poke-port problem is
to
> force the use of TCP. You can do this by changing the
> URL scheme to be rtspt:// instead of rtsp:// (the
"t" forces
> the use of TCP as opposed to UDP). If rtspt://xxx
plays
> back and rtsp://xxx won't, then it's most likely a
poke-port
> problem.
> 
> Eric
> =============================================
> Eric Hyche (ehychereal.com)
> Technical Lead
> RealNetworks, Inc.
> 
> > -----Original Message-----
> > From: clientapps-dev-bounceshelixcommunity.org
> > [mailto:clientapps-dev-bounceshelixcommunity.org] On Behalf Of ljun
> > Sent: Tuesday, March 11, 2008 5:47 AM
> > To: clientapps-devhelixcommunity.org
> > Cc: wmcode-protocol-devlists.helixcommunity.org
> > Subject: [clientapps-dev] there's no sound when
playing a wma via rtsp
> >
> > Hi
> >
> >
> >
> >      I have build splay_wm using vc7 and
successfully. But
> > when I tried to play a wma file via rtsp, there’s
no sound.
> > This file can be played and heard using realplayer
11 for
> > Windows and Windows media player. The attachment
is my
> > build.out and play log. What’s the problem?
> >
> >
> >
> > Link:
rtsp://kt68kmssst.dosirak.com/QP/3/54749622/54749622_192K.wm
a
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Best regards
> >
> >
> >
> > Eric Li (李军)
> >
> >
> >
> > www.realnetworks.com
> >
> >
> >
> >


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