RTP-SDP: WebRTC -> RTP -> ffmpeg -> HLS

[Pony Hugger]

Hi!

I'd like to publish a WebRTC-Stream via HLS. This is how the current "pipeline" looks like:

WebRTC -> RTP -> ffmpeg -> HLS

Unfortunately i am not able to receive the stream via ffmpeg or VLC.

I've already tried to generate an SDP file using rtpEndpoint.generateOffer() and rtpEndpoint.processOffer(viewerSDP), while "viewerSDP" was:

v=0

o=- 0 0 IN IP4 <<CLIENT-IP>>

s=

c=IN IP4 <<CLIENT-IP>>

t=0 0

m=video 26540 RTP/AVP 100

a=rtpmap:100 H264/90000

a=recvonly

(inspired by this thread: https://groups.google.com/forum/#!topic/kurento/I8Jr-Lfa7Qo)

or

v=0

c=IN IP4 <<CLIENT-IP>>

m=video 51000 RTP/AVP 96

a=rtpmap:96 H264/90000

m=audio 51002 RTP/AVP 97

a=rtpmap:97 mpeg4-generic/128

a=fmtp:97 streamType=5;profile-level-id=44;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3

Any ideas?

Thanks!

[Paulo R. Lanzarin]

You should use rtpEndpoint.processAnswer instead of processOffer if Kurento is the offeree in your case.
Otherwise it won't work at all.
If you've done that, please share both Kurento and ffmpeg (with -loglevel trace) so I can take a look at it.

s,

Paulo.

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[Pony Hugger]

Hi Paulo,

thanks for your offer! Before hassling with RTP again, i'll try to make use of the GStreamerFilter, to generate all necessary HLS files.

Cheers!  

[Pony Hugger]

GStreamerFilter won't work, as the filter needs sink AND source...

... so i am working again on the RTP-Connection.
This is what is happening, when i try to connect via VLC:

OFFER:

v=0

o=BOB 0 0 IN IP4 <<CLIENT-IP>>

s=-

c=IN IP4 <<CLIENT-IP>>

t=0 0

m=audio 9000 RTP/AVPF 96 0 97

a=rtpmap:97 AMR/8000

a=recvonly

m=video 9010 RTP/AVP 100

a=rtpmap:100 H264/90000

a=recvonly

ANSWER:

v=0

o=- 3738565098 3738565098 IN IP4 << KURENTO-IP >>

s=Kurento Media Server

c=IN IP4 << KURENTO-IP >>

t=0 0

m=audio 48280 RTP/AVPF 0 97

a=rtpmap:97 AMR/8000

a=sendonly

a=ssrc:3160412076 cname:user1674515572@host-329b04f9

m=video 40412 RTP/AVP 100

a=rtpmap:100 H264/90000

a=sendonly

a=ssrc:2508676416 cname:user1674515572@host-329b04f9

Events fired by Kurento:

RtpEndpoint > IN AUDIO

RtpEndpoint > IN VIDEO

RtpEndpoint > MediaStateChanged:

{ newState: 'CONNECTED',

  oldState: 'DISCONNECTED',

  source: '8d0d74c0-321c-41d5-b568-813e1baed9bc_kurento.MediaPipeline/efaa75c8-0997-4c91-9d5a-3f7c46e21123_kurento.RtpEndpoint',

  tags: [],

  timestamp: '1529576323',

  type: 'MediaStateChanged' }

RtpEndpoint > MediaStateChanged:

{ newState: 'DISCONNECTED',

  oldState: 'CONNECTED',

  source: '8d0d74c0-321c-41d5-b568-813e1baed9bc_kurento.MediaPipeline/efaa75c8-0997-4c91-9d5a-3f7c46e21123_kurento.RtpEndpoint',

  tags: [],

  timestamp: '1529576331',

  type: 'MediaStateChanged' }

VLC-Log: 

live555 demux error: no data received in 10s, aborting

That's confusing, as Kurento is noticing the attempt to connect.

[Pony Hugger]

This is some additional information from the Kurento logs:

2018-06-21 14:57:35,174571 4091 [0x00007fdae09f3700]    info kmsrtpconnection          kmsrtpconnection.c:91 kms_rtp_connection_set_remote_info() <KmsRtpConnection@0x7fdad822d060>  Set remote host: << CLIENT-IP >>, RTP: 9010, RTCP: 9011

2018-06-21 14:57:35,689208 4091 [0x00007fdabf189700] warning dtlssrtpdemux             gstdtlssrtpdemux.c:137 sink_chain() <dtls-srtp-demux>  received invalid buffer: 1

2018-06-21 14:57:36,354189 4091 [0x00007fdab67fc700]    info kmsutils                  kmsutils.c:1440 kms_utils_depayloader_monitor_pts_out() <rtpopusdepay53>  Add probe: Adjust depayloader PTS out

2018-06-21 14:57:36,680400 4091 [0x00007fdabf189700] warning srtpdec                   gstsrtpdec.c:1149 gst_srtp_dec_decode_buffer() <srtp-decoder:rtp_sink>  Unable to unprotect buffer (unprotect failed code 9)

2018-06-21 14:57:36,680519 4091 [0x00007fdabf189700] warning srtpdec                   gstsrtpdec.c:1178 gst_srtp_dec_decode_buffer() <srtp-decoder>  Other error, dropping

2018-06-21 14:57:36,892705 4091 [0x00007fdab7fff700]    info kmsutils                  kmsutils.c:1440 kms_utils_depayloader_monitor_pts_out() <rtph264depay50>  Add probe: Adjust depayloader PTS out

2018-06-21 14:58:00,177743 4091 [0x00007fdabf189700] warning dtlssrtpdemux             gstdtlssrtpdemux.c:137 sink_chain() <dtls-srtp-demux>  received invalid buffer: 1