[Live-devel] playSIP - creates empty file

[Markus Schumann]

How can I fix this?

Thanks
Markus.

From: live-devel-bounces at ns.live555.com [mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: Thursday, May 02, 2013 2:49 PM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] playSIP - creates empty file

I am trying to record the audio from a Polycom Telepresence m100 SIP software client.

On 10.0.71.24 I run a software VTC client configure to use SIP (Polycom Telepresence m100).
The URI is sip:10.0.71.24 at 10.0.71.24

On 10.0.71.109 I run the live555 command line tool playSIP calling 10.0.71.24.

playSIP creates only a zero length file named: audio-PCMU-1

Any advice?

The problem here is that our SDP parsing code currently only notes the first RTP payload format number in a SDP "m=" line (because our RTP processing code currently doesn't handle more than one RTP payload format code being used in a RTP stream).  Your server's SDP "m=" line is
            m=audio 8000 RTP/AVP 118 115 114 113 99 98 97 102 101 103 9 15 0 8 119
which is legal, but our code would be able to handle it if the "0" (i.e., PCMU) payload format code were first - e.g.
            m=audio 8000 RTP/AVP 0 118 115 114 113 99 98 97 102 101 103 9 15 8 119
because "0" (i.e., PCMU) RTP payload format happens to be the only RTP payload format that's used in this stream.

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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