[Fiware-robotics] R: Robot characteristics

[Bollano Gianmario]

Hi Luis,
I think the questions arisen from Roberto and Davide can be summarized as:

-          Assuming to use a chrome browser, do we need a specific "Kurento Client" code (e.g. a JS library for  Kurento APIs) to call a Kurento function and  transmit a video streaming to the media server?

-          Would it be possible to have a simple code snipped to try to transmit a video stream to Kurento and use it to check if it works immediately in our robot (equipped with chrome and linux)?

The point is not WebRTC, I think the different options for WebRTC clients are clear now, but instead identifying  the simplest code (Kurento client library, snippet code, etc) required to make a quick test and transmit a video stream from a Robot to a real  Kurento media server.
This will help to see if the Robot environment is sufficiently compliant with WebRTC and Kurento requirements, and the robot have enough resources (CPU, memory) to allow a realtime transmission of a video stream from a webcam.

Gianmario


Da: fiware-robotics-bounces at lists.fi-ware.org [mailto:fiware-robotics-bounces at lists.fi-ware.org] Per conto di Luis López Fernández
Inviato: martedì 17 febbraio 2015 16:20
A: Antonini Roberto
Cc: fiware-robotics at lists.fi-ware.org
Oggetto: Re: [Fiware-robotics] Robot characteristics

Hi Roberto,
Please, take into consideration the following information for having an understanding on how to use Kurento:

Kurento is:
- A server infrastructure (it receives streams from clients and "do things" with those streams such as transcoding, processing, recording, distributing, etc)
- A WebRTC capable server (it's capable of receiving WebRTC streams, among other types of streams)

Kurento is not:
- A WebRTC client (it cannot "open a webcam" and send the stream to a remote party)


Hence, in your architecture, you need two ingredients:
- A WebRTC client catching the stream from a Camera and sending the stream using WebRTC standard protocols
- A WebRTC server, for receiving the stream and "do things" with that stream.


The "WebRTC server" part is already solved by Kurento and you'll not need to do much for integrating with it.

The "WebRTC client" part is not solved by Kurento. You'll need to have your very own client and in my last e-mail I just provided different alternatives that you have. Kurento is not one of them because Kurento is not a client.

I hope this clarifies the issues.

Best.


El 17/02/2015, a las 16:12, Antonini Roberto <roberto1.antonini at telecomitalia.it<mailto:roberto1.antonini at telecomitalia.it>> escribió:


Hi Luis,
thanks for having promptly answered my e-mail .
Amongst the solutions you've proposed, it's not clear (at least to me) which of these are using KURENTO GE.
I figured out that you provided us with some code snippet (with apposite KURENTO API usage) to build a client and connect your GE from our robot, I guess these are only a test cases to validate WebRTC technology on the scenario we shared, so I suppose I miss the link between these tests and KURENTO.

Anyway, just to better clarify what we meant to do:
On our side, we would like to use KURENTO javascript clients (through Google Chrome) to connect to your KURENTO media server (using WebRTC technology), is it feasible?
Please, let us know which are the steps (and consequently the complexity) to integrate the components above in our scenario, if we understand well.

BR
Roberto and Davide

Da: Luis López Fernández [mailto:luis.lopez at urjc.es<http://urjc.es>]
Inviato: giovedì 12 febbraio 2015 16:29
A: Antonini Roberto
Cc: Garino Pierangelo; Colombatto Davide; fabio.dibenedetto at consoft.it<mailto:fabio.dibenedetto at consoft.it>; Bollano Gianmario; Angel Hernandez; Iñigo Gonzalez (igonzalez at ikergune.com<mailto:igonzalez at ikergune.com>); Jose Jaime Ariza (jjaime at ikergune.com<mailto:jjaime at ikergune.com>); Fernando Herranz (fherranz at ikergune.com<mailto:fherranz at ikergune.com>); fiware-robotics at lists.fi-ware.org<mailto:fiware-robotics at lists.fi-ware.org>
Oggetto: Re: Robot characteristics

Hi Roberto,

basing on the specifications you are providing, my recommendation is to integrate WebRTC support into the robot in a native way. For this, you have several options.

1. Use the WebRTC Google stack.
* This is the most mature WebRTC stack providing lots of advanced features
* It's the stack used by Chrome
* Can be compiled and used independently on the browser (with some work)
* Only supports VP8 codec. Supporting H264 requires some complex integrations
* Details of it can be found here: http://www.webrtc.org/

2. Use the WebRTC Ericsson Stack
* Less mature but also less heavy
* Supports natively H.264, which is a more performant codec for your use case.
* Details can be found here: http://www.openwebrtc.io/

Here, my choice would be option 1, but you may wish to perform a deeper analysis.


For validating that you webcam works correctly with WebRTC, do the following:

- Provide internet connectivity to the robot
- Install chrome on it
- Open this URL
-- https://talky.io/
- Fill a string in the form (e.g. "aaa") and press the button.
- Accept to share the webcam
- The video should appear
- Open another browser into another computer with Internet connectivity and a webcam
- Open the url https://talky.io/aaa (where "aaa" is the string you filled previously in the form)
- Accept to share the webcam
- You should have a video conference between the two browsers

Best.


-----------------------------------------------------------
Luis López Fernández
Subdirector de Investigación y Relaciones con la Empresa
Escuela Técnica Superior de Ingenieros de Telecomunicación
Universidad Rey Juan Carlos
http://www.etsit.urjc.es
e-mail: luis.lopez at urjc.es<mailto:luis.lopez at urjc.es>
Tf1: +34 914 888 747
Tf2: + 34 914 888 713






El 11/02/2015, a las 13:54, Antonini Roberto <roberto1.antonini at telecomitalia.it<mailto:roberto1.antonini at telecomitalia.it>> escribió:



Hi Luis
As agreed, we start sending to you the characteristics of the robot we have here, that's a turtlebot2  and the PC on board has Ubuntu 12.04 OS (more details available athttp://www.clearpathrobotics.com/turtlebot_2/tech-specs/))
The camera we intend to use is a Logitech c270 (more details available at http://www.logitech.com/it-it/product/hd-webcam-c270).

Let us know if this's enough, we wait for instructions on how to setup a WebRTC video streaming, in order to solve technical issues and test the end-to-end communication.
Thank you.
Davide and Roberto
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