Failed to unprotect SRTP / RTP packet

[Fernando Bernal]

Hi all,

I'm having a problem unprotecting the SRTP RTP streams, anyone knows something about this problem? Basically if I use VP8 codec I have no problem, but if I use H264 enconding I have a lot of traces showing this error. the video is delayed and it is decoded wrong.

Warning(srtpfilter.cc:576): Failed to unprotect SRTP packet, err=9

Error(channel.cc:642): Failed to unprotect video RTP packet: size=1149, seqnum=14794, SSRC=2664851050

is there any reason that the used codec can influence on this?

Thanks,

Fernando.

[Christoffer Jansson]

+Peter Boström +Henrik Boström do any of you have an idea of what this could be?

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[Marcello Vezzelli]

Il 21/12/2015 10:59, Fernando Bernal ha scritto:

Hi all,

I'm having a problem unprotecting the SRTP RTP streams, anyone knows something about this problem? Basically if I use VP8 codec I have no problem, but if I use H264 enconding I have a lot of traces showing this error. the video is delayed and it is decoded wrong.

Hi,
can you give more details about your environment? Are you testing with browsers or just WebRTC library?

regards
Marcello Vezzelli

[Fernando Bernal]

I'm using the C++ webrtc implementation, just testing the library and adding a H264 codec by myself. I'm no using browser just an application. The H264 codec have been implemented using Gstreamer.

[Peter Boström]

I'm not sure if repeat timestamps are enough to be considered a replay attack, but are you settings _timeStamp in the outgoing EncodedImage? Not sure what the implications of missing fields are, but you can compare to the MediaCodec implementation: https://chromium.googlesource.com/external/webrtc/+/9d3ab61325c5ed216ea52bc829f1d8c81347459b/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc#908

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[Fernando Bernal]

Yes, I'm setting the timestamp param and also the capture_time_ms_