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Error when parsing SDP answer

See original GitHub issue

After upgrading to version 0.9.14, I am getting the following error when parsing the recieved SDP answer:

Traceback (most recent call last):
  File "error.py", line 45, in <module>
    loop.run_until_complete(error())
  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/base_events.py", line 573, in run_until_complete
    return future.result()
  File "error.py", line 41, in error
    await pc.setRemoteDescription(RTCSessionDescription(sdp=sdp, type="answer"))
  File "/Users/tobiasfriden/airpelago/dmc-webrtc/lib/python3.7/site-packages/aiortc/rtcpeerconnection.py", line 528, in setRemoteDescription
    ssrc=media.ssrc[0].ssrc,
IndexError: list index out of range

Reverting back go 0.9.13 everything works fine. Minimal example code to reproduce:

import asyncio
from aiortc import RTCPeerConnection, RTCSessionDescription
from aiortc.contrib.media import MediaPlayer

# Received SDP
sdp = """v=0
o=- 3754725498 3754725498 IN IP4 3.121.248.224
s=VideoRoom 1234
t=0 0
a=group:BUNDLE 0
a=msid-semantic: WMS janus
m=video 9 UDP/TLS/RTP/SAVPF 96
c=IN IP4 3.121.248.224
a=recvonly
a=mid:0
a=rtcp-mux
a=ice-ufrag:Mfwz
a=ice-pwd:sPfYombZXNeZn1c5gpHZ27
a=ice-options:trickle
a=fingerprint:sha-256 D2:B9:31:8F:DF:24:D8:0E:ED:D2:EF:25:9E:AF:6F:B8:34:AE:53:9C:E6:F3:8F:F2:64:15:FA:E8:7F:53:2D:38
a=setup:active
a=rtpmap:96 VP8/90000
a=rtcp-fb:96 ccm fir
a=rtcp-fb:96 nack
a=rtcp-fb:96 nack pli
a=rtcp-fb:96 goog-remb
a=rtcp-fb:96 transport-cc
a=candidate:1 1 udp 2013266431 3.121.248.224 10174 typ host
a=candidate:2 1 udp 1677722111 3.121.248.224 10174 typ srflx raddr 172.18.0.2 rport 10174
a=end-of-candidates
"""

async def error():
    player = MediaPlayer("video.m4v")
    track = player.video

    pc = RTCPeerConnection()
    pc.addTrack(track)
    await pc.setLocalDescription(await pc.createOffer())

    await pc.setRemoteDescription(RTCSessionDescription(sdp=sdp, type="answer"))

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(error())

Issue Analytics

State:
Created 5 years ago
Comments:8

Top GitHub Comments

1reaction

jlainecommented, Dec 25, 2018

I have pushed out aiortc 0.9.15 which contains both fixes

0reactions

jlainecommented, Dec 25, 2018

You’re welcome, it’s good to have actionable issues which clearly describe the usecase + problem + the relevant SDP.

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