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Pri: 3
Type: Bug



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SDP audio RED cannot be parsed
Project Member Reported by minyue@webrtc.org, Sep 30 2014 Back to list
What steps will reproduce the problem?

1. Running chrome with logging enabled:
chrome --enable-logging --v=1 --vmodule=*libjingle/source/talk/*=3

2. Visit http://googlechrome.github.io/webrtc/samples/web/content/munge-sdp/
then 
Get media -> Create peer connection -> Create offer

3. Add the following lines to the SDP and click on Set Offer
a=rtpmap:127 red/8000
a=fmtp:127 103/103

What is the expected result?
One should be able to go on with create answer and go on to make a call.

What do you see instead?
Cannot make call. Can find

[44:44:0930/155638:VERBOSE1:webrtcsdp.cc(359)] Failed to parse: "". Reason: Failed to parse audio codecs correctly.

in the log.

According to https://tools.ietf.org/html/draft-ietf-mmusic-sdp-media-capabilities-17

such SDP should be valid.

webrtcvoicengine.cc is also ready to accept parameter="" to set RED codecs.

But it seems that libjingle SDP parser does not accept it.

What version of the product are you using? On what operating system?
Tested with Chrome 37, tot, can be other versions.

 
Comment 1 by vrk@webrtc.org, Oct 14 2014
Labels: Area-Network
Comment 2 by vrk@webrtc.org, Oct 28 2014
Cc: pthatcher@webrtc.org
Labels: -Pri-2 Pri-3 EngTriaged IceBox
minyue@, let us know if this is blocking you on something. Otherwise we're treating this as P3.
Comment 3 by vrk@webrtc.org, Oct 28 2014
Labels: -Area-Network Area-PeerConnection
Comment 4 by minyue@google.com, Oct 29 2014
This has been like so for a while. I don't know if anyone else reported it too.

This is related to another issue: https://code.google.com/p/webrtc/issues/detail?id=3619

I cannot use our tool 
http://googlechrome.github.io/webrtc/samples/web/content/munge-sdp/
to debug it due to this SDP parsing error.
Project Member Comment 5 by tnakamura@webrtc.org, Nov 4 2015
This bug hasn't been modified for more than a year, but it still repros for me with 48.0.2553.1. Note that the munge SDP test page has since moved to https://webrtc.github.io/samples/src/content/peerconnection/munge-sdp/.
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