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SRT, typical examples

Justin Kim avatar

Justin Kim
February 20, 2018

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Following last week's blog post announcing SRT in GStreamer, I'd like to briefly discuss another way to use an SRT stream: with VLC 3.0!

Released earlier this month, the latest version of the free & open source multimedia player (which also uses the GStreamer framework) now contains SRT modules which had been in development in VLC's master branch. Let's take a look at what VLC says.

$ vlc --list | grep srt
VLC media player 3.0.0 Vetinari (revision 3.0.0-3-g7821ebf808)
  access_output_srt      SRT stream output
  access_srt             SRT input

These modules can be seen in VLC’s preferences menu if “Show All” is checked in the preferences window.

SRT in VLC's preference menu

As we can infer from the name, VLC has input/output SRT modules. The basic usage isn’t different from the case when using UDP or TCP-based stream. From Olivier's article, we got a typical example to stream via SRT, then let's create SRT stream.

gst-launch-1.0 v4l2src ! video/x-raw, height=1080, width=1920 \
    ! videoconvert ! x264enc tune=zerolatency ! video/x-h264, profile=high \
    ! mpegtsmux ! srtserversink uri=srt://:8888/

Then, now, VLC can play the SRT stream with the URL, "srt://ip_address:8888/".

SRT in VLC screenshot

Limitations

Yes, The current SRT modules in VLC is able to work as an SRT player and an SRT stream generator. However, there are some limitations because VLC released version took a part of SRT module patch set.

Stream Encryption

To encrypt and decrypt SRT stream, a passphrase is required. The passphrase property patches have already been merged into VLC master, but not yet released. We are looking forward that next version of VLC has this feature.

Connection modes

We have created 4 different elements for GStreamer, but the current VLC modules only support client mode. That means the current version of VLC can play only if an SRT stream generator runs in listener(server) mode. Supporting all modes in SRT modules of VLC would be next challenge for us.

Conclusion

Hopefully, SRT modules in VLC, also GStreamer SRT plugins will have helped you to build SRT applications. Let's discuss the details of SRT with VLC and GStreamer!

Update (Jan 2019):

In GStreamer 1.16, we've decided to merge the clientsrc and serversrc srt elements into a single source element, and the same for the server. So the example pipeline in 1.16 is:

  gst-launch-1.0 v4l2src ! video/x-raw, height=1080, width=1920 \
    ! videoconvert ! x264enc tune=zerolatency ! video/x-h264,
profile=high \
    ! mpegtsmux ! srtserversink uri=srt://:8888/

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Comments (14)

  1. svy:
    Mar 27, 2018 at 02:26 PM

    Hey, has SRT access module been removed? Its not showing in the Windows version of v3.0

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    1. Olivier Crête:
      Mar 27, 2018 at 06:39 PM

      I don't think it's in the Windows build yet, we're actively working on finalizing the Windows integration. There is a problem with the poll/select integration and Windows.

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        1. Hi-Angel:
          Mar 31, 2018 at 12:31 PM

          I'm pretty sure poll() is implemented on Windows with WSL. I imagine you gotta find the dll that provides the function, and use it.

          You can list dll exports on Windows with "rabin2 -s some.dll" (from Radare — a FOSS reverse-engineering framework).

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        2. Justin Kim:
          Apr 02, 2018 at 12:11 AM

          SRT for windows has been merged into upstream.
          The modules are ready to run in VLC 4.0.0 nightly build. :)

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  2. Tony:
    May 12, 2018 at 05:43 AM

    Do you know if SRT will be merged into the ios and Android versions?

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    1. Olivier Crête:
      May 14, 2018 at 03:17 PM

      Android definitely, I tried just enabling it and it works, so someone just needs to submit the patch.

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      1. rajesh:
        May 22, 2018 at 12:56 PM

        I have found SRT Pipeline examples for Linux platform and they are working.

        I would like to try out on Android, May i know is there any srtserversink, srtclientsrc examples pipeline for android platform ?

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        1. Olivier Crête:
          May 22, 2018 at 04:55 PM

          With GStreamer, the pipeline should be the same on all platforms, except for the audio and video video sinks and sources which are specific to a platform.

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          1. rajesh:
            May 23, 2018 at 01:38 PM

            i have tried srtserversink with udpsrc and its working as like below.

            #terminal.1
            gst-launch-1.0 -v udpsrc port=9001 ! rndbuffersize max=1316 min=1316 ! srtserversink

            #terminal.2
            gst-launch-1.0 -v srtclientsrc uri="srt://127.0.0.1:7001" ! udpsink host=127.0.0.1 port= 7010

            #terminal.3
            ffmpeg -re -i output.ts -c:v copy -c:a copy -f mpegts udp://127.0.0.1:9001

            #terminal.4
            ffplay udp://127.0.0.1:7010


            But when i tried with filesrc or videotestsrc, its not working as follows.

            how to create pipeline srtserversink with filesrc or videotestsrc?

            is srt supports filesrc instead of udp ?
            if yes, could you give me working pipeline with filesrc?

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  3. Samantha:
    Sep 17, 2018 at 02:38 PM

    I have not much knowledge when it comes to it but this is a detailed passage. I'm gonna keep this in mind. SRT really caught my attention so I will manage to study more of it. Thanks for this!

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    1. Olivier Crête:
      Sep 18, 2018 at 07:11 AM

      Thank you for the feedback! Please don't hesitate to reach out if you have any questions regarding SRT!

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  4. Itsme:
    Feb 18, 2019 at 03:05 AM

    "Supporting all modes in SRT modules of VLC would be next challenge for us."
    Is this done now? For every operating system?

    Or another question, is there like any srt client out for Android? Im thinking about using srt to stream some content but I don't know if clients are aviable. Maybe a oppensource demo apk which I could than extend for my requirements. Or vlc for Android also sounds good if that works.

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