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  1. Help-Desk
  2. HELP-2850

FIWARE.Request.Tech.Data.Stream-oriented.Kurento_video_quality

    Details

    • Type: extRequest
    • Status: Closed
    • Resolution: Done
    • Fix Version/s: 2021
    • Component/s: FIWARE-TECH-HELP
    • Labels:
      None

      Description

      To the kind attention of Kurento experts,
      I would like to share the conversation with Luis Lopez about a video
      quality issue, in order to have your support through Jira as we have been
      told.

      Thank you

      ---------- Forwarded message ----------
      From: Luis L�pez Fern�ndez <luis.lopez@urjc.es>
      Date: 2015-04-21 20:38 GMT+02:00
      Subject: Re: Kurento > video quality
      To: Leonardo Galteri <leonardogalteri@gmail.com>

      Hi Leonardo,
      Today we have been informed that the FIWARE policies for providing support
      to Accelerator's participants need to be satisfied. Unfortunately this
      means that I can only provide support to you through the FIWARE Jira. I
      would appreciate if you could open a Jira issue for tracking this problem.
      Otherwise, the efforts we invest here shall be not covered by FIWARE, which
      is somehow a problem for us.

      Sorry for the inconveniences.

      Best.

      -----------------------------------------------------------
      Luis L�pez Fern�ndez
      Subdirector de Investigaci�n y Relaciones con la Empresa
      Escuela T�cnica Superior de Ingenieros de Telecomunicaci�n
      Universidad Rey Juan Carlos
      http://www.etsit.urjc.es
      e-mail: luis.lopez@urjc.es
      Tf1: +34 914 888 747
      Tf2: + 34 914 888 713

      El 21/04/2015, a las 20:30, Leonardo Galteri <leonardogalteri@gmail.com>
      escribi�:

      Hi Luis,
      thank you for your reply, unfortunately we haven't many choices because of
      the limitations of the video formats, but this could be a solution.
      Allowing a good quality streaming towards Wowza and let this server handle
      the distribution of the stream to iOS/Android users with HLS protocol. Is
      it a feasible solution in your opinion? How can I change the transcoding
      bitrate in Kurento, is there a configuration file, an API or is it a
      hardcoded parameter?

      Thank you again

      2015-04-20 16:37 GMT+02:00 Luis L�pez Fern�ndez <luis.lopez@urjc.es>:

      > Hi,
      > Indeed 300Kbps is the default configuration of KMS transcoders. This can
      > be changed, but only to a fixed value. In other words, you can improve the
      > quality but it will not be adaptive because RTMP don't support adaptive
      > quality. Is this what you are looking for?
      >
      > Best.
      >
      > -----------------------------------------------------------
      > Luis L�pez Fern�ndez
      > Subdirector de Investigaci�n y Relaciones con la Empresa
      > Escuela T�cnica Superior de Ingenieros de Telecomunicaci�n
      > Universidad Rey Juan Carlos
      > http://www.etsit.urjc.es
      > e-mail: luis.lopez@urjc.es
      > Tf1: +34 914 888 747
      > Tf2: + 34 914 888 713
      >
      >
      >
      >
      >
      >
      > El 20/04/2015, a las 16:33, Leonardo Galteri <leonardogalteri@gmail.com>
      > escribi�:
      >
      > Hello Luis,
      > the problem is that Wowza doesn't support VP8 format, so we have to use
      > the RtpEndpoint on Kurento to perform our stream with the standard h.264.
      > In this way, the bitrate is fixed to 300 kb/s, that is we have a bad
      > quality blocky video, whatever protocol we choose in Wowza in order to
      > stream to any mobile device.
      > Furthermore, even if we don't use Wowza, if we reproduce the RTP stream
      > obtained from Kurento with any other tool (VLC, ffplay, gst-play, etc) we
      > obtain exactly the same result, a fixed bitrate of 300 kb/s.
      >
      > Thank you
      >
      > 2015-04-20 16:16 GMT+02:00 Luis L�pez Fern�ndez <luis.lopez@urjc.es>:
      >
      >> Hi,
      >> Indeed RTMP don't support adaptive quality. This is one of the reasons
      >> why other protocols such as WebRTC or HLS were created. In principle, if
      >> latency is not an issue for you, you should be able to stream from Wowza
      >> using adaptive protocols such as HTS or MPEG-DASH, which are supported by
      >> Wowza off-the-shelf. However, this may also require specific players which
      >> are not always free.
      >>
      >> Best.
      >>
      >> L.
      >>
      >>
      >> El 20/04/2015, a las 15:00, Daniele Galiffa | GoalShouter.com
      >> <http://goalshouter.com/> <daniele@goalshouter.com> escribi�:
      >>
      >> Ciao Luis, how are you doing?
      >>
      >> I hope everything is great.
      >>
      >> We are continuing working on Kurento but we have some issues in streaming
      >> from Kurento to Wowza but it seems that RTMP stream has a fixed video
      >> quality.
      >>
      >> Is there any chance to change or set it?
      >>
      >> Leo is in cc to provide more tech-details about the issue we are trying
      >> to solve.
      >>
      >> Thanks,
      >> d.
      >>
      >>
      >> –
      >>
      >> [image: GoalShouter] <http://www.goalshouter.com/>Daniele Galiffa | CEO
      >> daniele@goalshouter.com <rafaele@goalshouter.com> | +39 335 57 53 078
      >> GoalShouter.com <http://www.goalshouter.com/> | [image: View my profile on LinkedIn] <http://linkedin.com/in/danielegaliffa> [image: Follow me on Twitter] <http://twitter.com/danielegaliffa> [image: Skype me] [image: Facebook Page] <https://www.facebook.com/GoalShouter> [image: Get iPhone App for free] <http://itunes.apple.com/app/goalshouter/id428932802?mt=8>
      >> [image: Startup Sauna] <http://startupsauna.com/>StartUp Sauna Spring Batch 2012
      >> StartUp Sauna Demo Day Winner | Helsinki, June 8th 2012
      >>
      >>
      >>
      >
      >

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      [Created via e-mail received from: Leonardo Galteri <leonardogalteri@gmail.com>]

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          • Assignee:
            llopez NaevaTeC Development Team
            Reporter:
            fw.ext.user FW External User
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            • Created:
              Updated:
              Resolved: