RtpEndpint -> WebRtc using Hardware Encoder

[Matan Givoni]

Hi,

I am trying to broadcast a stream coming from Haivision Makito DVI. Makito is a hardware encoder which captures a FHD display using DVI cable, compresses using h.264 codec and streams in number of protocols (TS over UDP, TS over RTP, Direct RTP, Quicktime, RTMP).

• So far I have managed to play a RTSP stream from vlc to Kurento
• I have implemented a RtpEndpoint -> WebRtc example which is published in this repository.
• The encoder's `sdp` can be accessed here - SDP.
• 
  
• At first Kurento had crashed and throw an error saying "Could not join Multicast group: No such Device" which I solved using this post.
• 
  
• Now, my server side and client side are working and communicating perfectly but no video can be seen.

Currently I don't have a clue what is the problem.

This is the SDP answer generated by Kurento after using rtpEndpoint.processOffer():

v = 0

o =- 3718280759 3718280759 IN IP4 192.168.6.20

s = Kurento Media Server

c = IN IP4 192.168.6.20

t = 0 0

m = video 58116 RTP/AVP 96

a = fmtp: 96 packetisation-mode=1; sprop=parameter-sets=Z0IAKYxoB4ifl/8AAQABEAAAAMAQAAADyEAAAAAAA=,aM48gAAAAA=

a = ssrc:3106833799 cname:user3165393302@host-52028916

m = audio 34338 RTP/AVP

a = ssrc:396556932 cname:user3165393302@host-52028916

• Which of the above protocols does Kurento currently support?
• Do I place some commands in the wrong order?
• What am I doing wrong?

Please help,

Thanks

[Matan Givoni]

Update:

   I have managed to play a stream from the encoder using RTSP and PlayerEndpoint -> WebRTC pipeline.

   But the quality isn't the best (`ffmpeg` and `VLC` doing a much better job).

   I think `transcoding` and the lack of bandwidth control in `PlayerEndpoint` are the reason for low quality.

If VLC can play `QuickTime`, `TS over RTP` and `TS over UDP` streans so I bet `Kurento` can do that too.

• The encoder broadcasts QuickTime, TS, and Direct RTP using `Multicast` addresses, is that the reason why RtpEndpoint can't connect to the stream?

• Does `Kurento` even support `Multicast`?

• Can I disable transcoding and force a h.264 stream to WebRtc? 
  

[Matan Givoni]

Ok I finally managed to make it work.

The problem was a wrong udp port.

I had to take at the udp port described in the  sdp answer which is returned from rtpEndpoint.processOffer() and reconfigure Haivision Makito at runtime.

Thanks for the help :|

[Micael Gallego]

Glad to hear that. 

It would be great if you could share your code so others can take a look to it.

Best regards

Micael Gallego

Kurento / OpenVidu Project Lead

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[Matan Givoni]

I'll share every source code I can.

[phom...@gmail.com]

Thanks Matan!  That is what I call giving back!  Kurento is a great program that we'll keep alive by just that.

I'm not there yet, and I'm not a node.js guy so I'll need to reverse engineer things, but grabbing from a mpeg compression board and/or USB stick is on my todo list so this will help me!

Paul

On 11/11/17 3:33 AM, Matan Givoni wrote:

I'll share every source code I can.

On Monday, November 6, 2017 at 2:10:10 AM UTC+2, OpenVidu wrote:

Glad to hear that. 

It would be great if you could share your code so others can take a look to it.

Best regards

Micael Gallego

Kurento / OpenVidu Project Lead

On Mon, Nov 6, 2017 at 12:19 AM, Matan Givoni <matan...@gmail.com> wrote:

Ok I finally managed to make it work.

The problem was a wrong udp port.

I had to take at the udp port described in the  sdp answer which is returned from rtpEndpoint.processOffer() and reconfigure Haivision Makito at runtime.

Thanks for the help :|

Friday, November 3, 2017 at 5:26:40 PM UTC+2, Matan Givoni wrote:

Update:

   I have managed to play a stream from the encoder using RTSP and PlayerEndpoint -> WebRTC pipeline.

   But the quality isn't the best (`ffmpeg` and `VLC` doing a much better job).

   I think `transcoding` and the lack of bandwidth control in `PlayerEndpoint` are the reason for low quality.

If VLC can play `QuickTime`, `TS over RTP` and `TS over UDP` streans so I bet `Kurento` can do that too.

• The encoder broadcasts QuickTime, TS, and Direct RTP using `Multicast` addresses, is that the reason why RtpEndpoint can't connect to the stream?

• Does `Kurento` even support `Multicast`?

• Can I disable transcoding and force a h.264 stream to WebRtc? 
  

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[Matan Givoni]

UPDATE

The multicast problem was not solved using the post here https://stackoverflow.com/questions/38998344/could-not-join-multicast-group-no-such-device.

It was just a weird behavior caused by a bug in my ICE exchanging implementation.

I can now say that Kurento is able to connect a multicast channel, just make sure you have a proper SDP!