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How to stream video and audio from a Raspberry Pi with no latency

I have finally finished my last exams, so now I have more time to focus on some of my own projects. It has been a while since our Kickstarter campaign was successfully funded, but we are still working on making the experience better for the final users.

After the campaign ended we sent out a survey to all our backers with several questions about there address, profession and so on, but we also asked them if they had any suggestions for improvements or extra features they would like to see added to the Balanduino. A lot of people asked if we could enable wireless streaming for it.
I was personally very excited about that since I have been playing with the thought for quite a while, so when the official camera module for the Raspberry Pi became available I bought it straight away.

Raspberry Pi camera module

If you do not have much experience with the Raspberry Pi I recommend reading Thomas’s blog post he wrote a while ago: http://blog.tkjelectronics.dk/2012/09/raspberry-pi-gpio-control/ and also to viset the official homepage: http://www.raspberrypi.org/.

I really have not used my Raspberry Pi that much – it has been laying on my desk for quite some time, as I did not have any real use for it until now. I have tried some different approaches, but ended up using a something called gstreamer 1.0. Note that there is currently no official binaries for Windows, so you will have to compile them yourself, but it works great on both Mac OS X and Linux.

I am running Arch Linux on my Raspberry Pi since I do not need the desktop environment that comes with the official Raspbian “wheezy” image, but it should not make much of a difference.

I will not go into much detail on how to install gstreamer 1.0 on your computer, but instead I will refer to the page I originally got the commands from: http://pi.gbaman.info/?p=150.

Also check out the original forum post: http://www.raspberrypi.org/phpBB3/viewtopic.php?uid=56951&f=43&t=44987&start=0.

Video

To stream video from my Raspberry Pi I run the following command:

raspivid -t 999999 -w 1080 -h 720 -fps 25 -hf -b 2000000 -o - | \
gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 \
! gdppay ! tcpserversink host=serverIp port=5000

And to receive the video on my Mac I run the following command in the terminal:

gst-launch-1.0 -v tcpclientsrc host=serverIp port=5000 \
! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

Be sure to replace serverIp with the ip of your Raspberry Pi. You can get it by running the following command on the Raspberry Pi:

ifconfig

The video quality is really great and there is basically no latency at all.

Audio

To stream audio turned out to be a little harder to get working. There is no audio input on the Raspberry Pi, so I used an old Icemat USB Sound card I had laying around.

First of all type the following command into your Raspberry Pi:

lsusb

It should print out something like this:

Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. LAN9500 Ethernet 10/100 Adapter / SMSC9512/9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 004: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter

Note the last device is my USB sound card.

Btw I recommend using ssh to login to your device. In fact I never use the HDMI output, as I prefer using my laptop. For more information check out this guide by Adafruit: http://learn.adafruit.com/adafruits-raspberry-pi-lesson-6-using-ssh/.

If your audio device is not working properly, then I recommend googling your USB sound card, as somebody else have properly already written a guide on how to get it working.

After that you will need to install the following packages: ‘alsa-utils’, ‘alsa-firmware’, and ‘alsa-plugins’.

Since I run Arch Linux I do this by running:

pacman -S alsa-utils alsa-firmware alsa-plugins

After that reboot your device:

reboot

If you run Raspbian “wheezy”:

shutdown -r now

After that run the following command:

cat /proc/asound/cards

This should print out a list of your sound cards like so:

 0 [ALSA           ]: BRCM bcm2835 ALSbcm2835 ALSA - bcm2835 ALSA
                      bcm2835 ALSA
 1 [Set            ]: USB-Audio - C-Media USB Headphone Set
                      C-Media USB Headphone Set at usb-bcm2708_usb-1.2, full speed

Notice that the name of my device is ‘Set’ – we will use this later.

You can also see the name by running the following command:

asoundconf list

To get even more information run:

aplay -l

Now we want to set this sound card as the default. This is done by the following command:

asoundconf set-default-card cardname

Be sure to replace ‘cardname’ with the name of your sound card. In my case I replace it with ‘Set’ like so:

asoundconf set-default-card Set

Also add the following:

pcm.!default {
    type hw
    card Set
    device 0
}
ctl.!default {
    type hw
    card Set
    device 0
}

To: /etc/asound.conf:

nano /etc/asound.conf

Now reboot once more.

Now it is time to test if it is actually working. Run the following command:

speaker-test -c 2

You should hear noise in your headphones.

Okay now try to run the following command:

gst-launch-1.0 audiotestsrc ! alsasink

You should hear a high pitch tone.

Now for something a bit more interesting. Try to run the following command:

gst-launch-1.0 alsasrc device=plughw:Set ! alsasink

Be sure yo replace ‘Set’ with the name of your sound card.
Now the input from the microphone should be played out the audio output of the USB sound card.

To adjust your setting – like volume, microphone level etc. Use the following command:

alsamixer

And then to store your settings:

alsactl store

To make a 10 second audio recording at a samplerate of 16000 bit/s via the microphone run:

arecord -D plughw:Set -r 16000 test.wav -d 10

To play it back:

aplay -D plughw:Set test.wav

Now to the fun part!

To stream the audio run:

gst-launch-1.0 -v alsasrc device=plughw:Set \
! mulawenc ! rtppcmupay ! udpsink host=clientIp port=5001

Replace the clientIp with your computers ip address. Normally I just set the end to 255, so it can be received on every computer on the network, for instance I set mine to: 10.0.0.255.

To receive the audio on your computer:

gst-launch-1.0 -v udpsrc port=5001 caps="application/x-rtp" \
! queue ! rtppcmudepay ! mulawdec ! audioconvert ! autoaudiosink sync=false

If you experience dropouts you might want to add ‘num-buffers=1000’ just after ‘device=plughw:Set’ at the server side, but in my experience it actually works better by not using it.

In the end I decided to create two scripts. One at the streaming end (the Raspberry Pi) and another and the receiver – my computer. This will allow me to stream the video and audio simultaneously from the Raspberry Pi to my computer.

The streaming script:

#!/bin/bash -e

serverIp=$(ifconfig | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}')
clientIp=$(echo $serverIp | cut -d '.' -f 1-3).255 # Send to all

gst-launch-1.0 -v alsasrc device=plughw:Set \
! mulawenc ! rtppcmupay ! udpsink host=$clientIp port=5001 &

raspivid -t 999999 -w 1080 -h 720 -fps 25 -hf -b 2000000 -o - | \
gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 \
! gdppay ! tcpserversink host=$serverIp port=5000

kill $!

And the receiving script:

#!/bin/bash -e

serverIp=rpi.local

gst-launch-1.0 -v udpsrc port=5001 caps="application/x-rtp" \
! queue ! rtppcmudepay ! mulawdec ! audioconvert ! autoaudiosink sync=false &

gst-launch-1.0 -v tcpclientsrc host=$serverIp port=5000 \
! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

kill $!

Make sure to make the script executable:

chmod +x /path/to/your/script.sh

Note that I have setup Bonjour on the Raspberry Pi so I can simply refer to it as hostname.local – in my case rpi.local. More information can be found at the following site: http://gettingstartedwithraspberrypi.tumblr.com/post/24398167109/file-sharing-with-afp-and-auto-discovery-with-bonjour.

I am very satisfied with the performance. There is almost no latency at all both via a wired or a wireless connection.

Fell free to post any questions or comments below and I will answer as quickly as possible! ๐Ÿ™‚

  1. AdskiRemote
    July 17th, 2013 at 21:46 | #1

    Hi,

    thank you very much for the bash scripts. I tried them out, they work very well.

    But could you could help me?

    I’m trying to adjust your code for streaming video (rPi Camera module) and Audio (USB soundcard – hw:1,0) to utream or another of the online services.

    I tried ffmpeg and the delay is just too much and I can’t sync the audio, it moves in and out an in the end just lags behind more and more.

    So I looked at gstreamer and came across your post.

    Is there any advice you could give me?

    Many thanks

  2. July 18th, 2013 at 21:28 | #2

    @AdskiRemote
    Sorry I can’t help you with that. I think you would need to convert the stream on a computer and then send that stream to ustream. You might be able to set up a server to do that for you.

    The problem is that the Raspberrry Pi doesn’t have enough processing power to convert the stream and send it without major delay, as you saw with ffmpeg.

  3. mybox
    July 24th, 2013 at 00:46 | #3

    Hi,

    thank you for the useful guide.

    I need to clarify can gstreamer server in the Raspberry Pi stream out a video protocol that can be receive from another client application natively like using GUI VLC, GUI XBMC, console mplayer, console omxplayer etc.

    Does the gstreamer server support multiple client connection ?

    Thank you

  4. July 24th, 2013 at 11:41 | #4

    @mybox
    I have not figured out to do something like that without having a huge delay on the video feed. If you figure out to do so using gstreamer, please let me know.

    I believe so, simply just run the receiver script on another computer and see how it works.

  5. mybox
    July 24th, 2013 at 14:08 | #5

    I have tried using GUI VLC open network stream (Pi IP Addr is 192.168.0.136):-
    rtmp://192.168.0.136:5000
    rtsp://192.168.0.136:5000
    tcp://192.168.0.136:5000
    rtp://192.168.0.136:5000

    The script running at Pi is:-
    raspivid -t 999999 -h 720 -w 1080 -fps 25 -hf -b 2000000 -o – | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=192.168.0.136 port=5000

    There is error message display on VLC :- Your input can’t be opened:

    The network connection from my PC where VLC is running to the Pi is fine

    Any idea is it the parameter given to VLC is wrong ?

  6. mybox
    July 24th, 2013 at 14:12 | #6

    Pls also let me know the script to run in GUI XBMC, console mplayer & console omxplayer, or any others GUI or console video player application, I will try that out.

    Thanks

  7. mybox
    July 24th, 2013 at 14:44 | #7

    When I run the script on another Pi:-
    gst-launch-1.0 -v tcpclientsrc host=192.168.0.136 port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

    It gives below error:-
    WARNING: erroneous pipeline: no element “avdec_h264”

    Any advise ?

  8. July 24th, 2013 at 16:57 | #8

    @mybox
    You can’t open the stream in VLC. You need to have gstreamer installed on your computer and then run the receiver script I have provided. gstreamer is only available on Mac OS X and Linux, so you can’t use it in Windows.
    In order to see the stream VLC you properly have to convert the raw stream from gstreamer on a your computer or server and then watch the outgoing stream in VLC.

    I haven’t got two Pi’s, so I can’t test that, sorry.

  9. Ronin.si
    July 25th, 2013 at 09:02 | #9

    Thank you for this great guide.

    Would it be possible to save fullHD video and at the same time stream low quality video (320×240)? I managed to split video in two pipelines using gstreamer tee, but I can’t figure it out, how to properly reduce resolution. If I understand it correctly the video should be decoded, resized with videoconvert and encoded before using stream command.

    Thanks

  10. July 25th, 2013 at 19:15 | #10

    @Ronin.si
    Sorry, but I can’t help you with that. Please post your solution if you figure it out!

  11. July 27th, 2013 at 22:59 | #11

    Hey can you please contact me..
    I think I have a use for your set up mentioned above but for audio only..

    Hope to hear from you soon

  12. July 27th, 2013 at 23:01 | #12

    @simon
    Okay. Please elaborate.

  13. July 28th, 2013 at 06:05 | #13

    Hey
    Basically I would like to make a wireless microphone..
    Could you please email me, and I can give you the full idea?

    Thanks
    Simon

  14. July 28th, 2013 at 11:20 | #14

    @simon
    Okay. Check you inbox. I have just send you one.

  15. August 1st, 2013 at 08:32 | #15

    I have the same problem as @mybox: WARNING: erroneous pipeline: no element รข??avdec_h264รข?ยณ

    avdev_h264 doesn’t seem to be a gstreamer plugin according to http://gstreamer.freedesktop.org/documentation/plugins.html so I’m very confused!

  16. August 1st, 2013 at 09:44 | #16

    Oh `sudo pacman -S gst-libav` solved the problem on Archlinux. Thanks!

  17. August 1st, 2013 at 12:09 | #17

    @Kai Hendry (@kaihendry)
    Thanks for posting your solution ๐Ÿ˜‰

  18. David
    August 15th, 2013 at 08:44 | #18

    Hello.
    I have tried your code but i have error.
    —————————————-error mesages——————————–

    pi@raspberrypi:~$ gst-launch-1.0 -v alsasrc device=plughw:1 ! mulawenc ! rtppcmupay ! udpsink host=192.168.10.255 port=5001
    Setting pipeline to PAUSED …
    ERROR: Pipeline doesn’t want to pause.
    ERROR: from element /GstPipeline:pipeline0/GstUDPSink:udpsink0: GStreamer encountered a general resource error.
    Additional debug info:
    gstmultiudpsink.c(959): gst_multiudpsink_start (): /GstPipeline:pipeline0/GstUDPSink:udpsink0:
    Failed to bind socket: Unable to create socket: Address family not supported by protocol
    Setting pipeline to NULL …
    Freeing pipeline …

    —————————–end——————————
    Please Help me…

  19. August 16th, 2013 at 20:56 | #19

    @David
    I don’t know the answer to that, sorry!

  20. darius
    August 30th, 2013 at 07:26 | #20

    Hi there.
    I need for a scool project one kit based on raspberry-pi with:
    one Micro Load Cell (0-5kg), one webcam, one web interface where I can see the streaming of 1 or 2 webcamera, and values of applied force(compression force) on sensor distinct field, at intervals of 3 seconds.
    Can you help me with this project?

  21. August 30th, 2013 at 17:18 | #21

    @darius
    Check out this blog post: http://wolfpaulus.com/jounal/embedded/raspberrypi_webcam. I will get you started with creating a webpage where you can watch the camera feed ๐Ÿ˜‰

  22. RicS
    September 4th, 2013 at 18:07 | #22

    Hello. Your tutorial helped me a lot, I was trying to do some streaming but with a webcam and I used your tutorial for the audio, its all working well but I have a problem. ctrl+c only kills one of the processes, i wold like to know how to kill both.

  23. September 4th, 2013 at 20:23 | #23
  24. Vahik
    September 18th, 2013 at 07:55 | #24

    Hi there,
    I am a newbie and trying to do your commands, step by step, but in my Archlinux, there is i am typing “asoundconf list”, receiving the following error:
    -bash: asoundconf: command not found

    so what can i do?

  25. September 18th, 2013 at 13:34 | #25

    @Vahik
    You need to install it from AUR: https://aur.archlinux.org/packages/asoundconf/. I recommend install Yaourt: https://wiki.archlinux.org/index.php/Yaourt. This will allow you to install it just like you would with pacman.

  26. siraya
    September 22nd, 2013 at 12:29 | #26

    hi
    nice blog
    sorry for newbie
    can u help me i want to do the other way round
    my pc as a server for audio and raspberry as a receiver

    thanks

  27. September 22nd, 2013 at 20:30 | #27

    @siraya
    It is very similar. I would recommend using gstreamer as well. Do you only want to stream audio or video as well?

  28. RicS
    September 23rd, 2013 at 19:26 | #28

    Lauszus :
    @RicS
    You need to kill the process. See the following site: http://www.cyberciti.biz/faq/kill-process-in-linux-or-terminate-a-process-in-unix-or-linux-systems/.

    so waht does the “kill $!” does?

    maybe i create another script with the pkill comand

  29. September 23rd, 2013 at 19:33 | #29

    @RicS
    It kills the last process executed in the background. See: http://stackoverflow.com/a/1624713/2175837.
    Okay you can do that as well.

  30. ciompoco
    September 26th, 2013 at 08:57 | #30

    @Ronin.si
    can you tell me please how did you manage to see video stream at the same time with local storage? i also tried with tee, but didn’t succeed with the streaming part, i receive only some raw data, in chrome, a file starts downloading, raw data i guess. thanks!

  31. September 26th, 2013 at 09:59 | #31

    @ciompoco
    What do you mean? What are you using Chrome for anyway? You need to install gstreamer: http://gstreamer.freedesktop.org/download/ and then run the command that I have provided.

  32. ciompoco
    September 26th, 2013 at 10:28 | #32

    also, i don’t have a stream even with the command mentioned here. chrome return “no data received”, but if i refresh the page several times, a file start to download and stop after a short period of time. i can’t see video at all. i would really apreciate some help here, i’m stucked.

  33. ciompoco
    September 26th, 2013 at 10:29 | #33

    can’t i see video stream on a web page with gstreamer?

  34. September 26th, 2013 at 16:13 | #34

    @ciompoco
    No you can’t use gstreamer in Chrome. You would need to write some kind of application that uses gstreamer to receive the stream. This post only shows how to use gstreamer from the command line and not implement it in any application, as I don’t need that, so I haven’t looked into it.

  35. ciompoco
    September 27th, 2013 at 07:10 | #35

    ok, i appreciate your support!

  36. September 28th, 2013 at 18:07 | #36

    @ciompoco
    You are welcome. If you are interrested in writing your own application using gstreamer you should check out there tutorials: http://docs.gstreamer.com/display/GstSDK/Tutorials ๐Ÿ˜‰

  37. pimlico
    October 7th, 2013 at 05:50 | #37

    Lauszus,

    Everything worked really well, thanks to your clear instructions. Very creative and much obliged.

    raspberry:

    gst-launch-1.0 -v tcpclientsrc host=xxx.xxx.xxx.xxx port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

    os x:

    gst-launch-1.0 -v tcpclientsrc host=10.0.1.16 port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  38. October 7th, 2013 at 14:01 | #38

    @pimlico
    Good to hear that you found it useful ๐Ÿ™‚

  39. carlos
    November 15th, 2013 at 15:11 | #39

    Hi, I am trying to stream audio from a raspberry pi to another, using your instructions. On the receiving end I get the message

    Cannot connect to server socker err= No such file or directory
    Cannot connect to server request channel
    jack server is not running or cannot be started

    Do you have any idea why this happens? also, is there any documentation to understand the commands you use?

  40. November 15th, 2013 at 15:13 | #40

    @carlos
    Are you sure that you are using the right IP address?

    Documentation is available here: http://gstreamer.freedesktop.org/documentation/.

  41. NikTheGreek
    November 21st, 2013 at 23:37 | #41

    Hi.
    Tested your camera streaming code for and working perfectly.
    What i want to do is to use UDP instead of TCP but seem that i can’t find how to do this.. ๐Ÿ™
    Can you please guide me on how to use UDP ?

    Thank you.

  42. November 26th, 2013 at 23:33 | #42

    @NikTheGreek
    No I can not, sorry. I haven’t used gstreamer for a while, but it is very similar to the approach above.

  43. JoostDutch
    January 25th, 2014 at 11:44 | #43

    Hi, i`m doing your method step by step but i got the error bash:asoundconf:command not found.
    I saw that someone earlier had the same problem but i`m running wheezy instead of arch linie.

    So what can i do?

  44. January 29th, 2014 at 19:47 | #44

    @JoostDutch
    Have you remembered to install all the packages needed?

  45. Alexander B.
    February 21st, 2014 at 09:25 | #45

    I tried streaming from pi to pi and from pi to windows but I was not able to get the latency as low as you described (I have a latency of almost half a second).

    You mentioned that you are using Arch Linux instead of Raspbian. Could that be the reason for the lower latency?

  46. February 24th, 2014 at 21:00 | #46

    @Alexander B.
    I can’t say for sure, but it would be interesting to see. Please post your findings if you ever try it ๐Ÿ˜‰

  47. May 5th, 2014 at 14:09 | #47

    Thanx, nice tutorial.
    [@Alexander B.] You probably should take care about your input buffering. The receiving application can have a large input buffer. Also the latency (in H.264-based apps) depends on the h.264 profile and level used by the encoder. The encoder can delay output because it can encode (when configured so) the next several frames using a reference frame.

  48. Fred
    May 12th, 2014 at 02:45 | #48

    I’m using gstreamer-0.10 in Ubuntu and this receiving code worked for me.

    gst-launch -v tcpclientsrc host=192.168.1.107 port=5000 ! gdpdepay ! rtph264depay ! ffdec_h264 ! ffmpegcolorspace ! autovideosink sync=false

    Transmitter code on the Pi is the one from this blog.

  49. May 12th, 2014 at 18:20 | #49

    @Fred
    Thanks for sharing ๐Ÿ˜‰

  50. SB YIM
    June 18th, 2014 at 06:55 | #50

    Hi,

    About Your solution,,,
    Can I receive stream using Safari,Chrome,FireFox,Explorer on Windows?

    And using Android Phone?

    How about the IP CAM VIEWER of android App? Can I?

    Thanks,
    SB,YIM

  51. June 20th, 2014 at 16:50 | #51

    @SB YIM
    No you can not view it in a browser, but you will be able to write a dedicated Android app that. Please take a look at the following site for more information: http://www.gstreamer.com/.

  52. Damien
    August 10th, 2014 at 11:42 | #52

    Hello, Thank you very much for the scripts.
    Can you you tell me how to save the stream locally (video + audio) in an unique avi file or in other extension ?

  53. Damien
    August 10th, 2014 at 13:21 | #53

    Hello,
    With your streaming video script i have an error :

    ERROR: from element /GstPipeline:pipeline0/GstH264Parse:h264parse0: No valid frames found before end of stream
    Additional debug info:
    gstbaseparse.c(1066): gst_base_parse_sink_default (): /GstPipeline:pipeline0/GstH264Parse:h264parse0
    ERROR: pipeline doesn’t want to preroll.

    Do you have an idea why ?
    Thank you

  54. August 12th, 2014 at 17:43 | #54

    @Damien
    I haven’t used this for a while and haven’t got time to look into it right now, sorry.

  55. Damien
    August 13th, 2014 at 18:36 | #55

    For the preroll error, it was just a permission issue : just do that :
    sudo chmod a+rw /dev/vchiq

    and the stream start correctly, received is ok too.
    Thank you !

  56. kimSanghuck
    December 29th, 2015 at 13:46 | #56

    @Lauszus
    How do real-time video or audio is sent in real time to your Android phone?

  57. January 1st, 2016 at 13:33 | #57
  58. February 8th, 2016 at 19:34 | #58

    ?Would be perfect combined with the free open source software Datahrei/Restreamer to get a 24 FPS HLS streaming camera for your website. https://datarhei.github.io/restreamer

  59. funkedelic_bob
    April 2nd, 2016 at 07:48 | #59

    @Kristian Sloth Lauszus

    Hey Lauszus,

    I used these instructions about a year ago and they worked without a hitch! Well… for a linux noob like me it took some tinkering (and i was using Debian not Arch) but I got my audio streaming!

    I decided to revisit this project but things really aren’t working this time. Doing
    sudo apt-get install alsa-firmware alsa-plugins
    just gives back:
    E: Unable to locate package alsa-firmware
    E: Unable to locate package alsa-plugins

    And asoundconf returns:
    asoundconf: command not found
    Some initial googling makes it seem like it’s deprecated or not in use anymore for Pulse?

    Anyway I’d really appreciate any guidance you can give. I really can’t seem to find anyone else or guides that provide latency free audio streaming.

    Cheers

  60. April 14th, 2016 at 23:09 | #60

    @funkedelic_bob
    Unfortunately I have not played with this for a long time, so unfortunately I can’t be of much help.

  61. Jonas Grossenbacher
    June 9th, 2016 at 06:17 | #61

    Is there an possibilizy to change the sample rate of the audio with this method(gst-launch -1.0 -v alsasrc device=plughw:1,0 rate= 16000… for example) I have the problem, that if i want to save and stream at the same time the raspberry can’t read the audio input fast enought with sample rate on 44100. Thanks for help.

  62. GuyS
    August 30th, 2017 at 10:26 | #62

    Hi there, getting this massage and couldn’t find solution on the web,
    any idea? Thanks

    ** (gst-launch-1.0:8492): CRITICAL **: gst_gl_window_get_context: assertion ‘GST_IS_GL_WINDOW (window)’ failed
    Caught SIGSEGV
    exec gdb failed: No such file or directory
    Spinning. Please run ‘gdb gst-launch-1.0 8492’ to continue debugging, Ctrl-C to quit, or Ctrl-\ to dump core.

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