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Without video, in linux and windows

(Igor) #1


I do not have video, I’ve already reviewed the hardware part. The settings that previously gave problems with regard to this.

I have the connection, everything works, I just do not have the video.
I already tried using QGC in Windows 10, and also in Linux Ubuntu 16.04

Can anyone help?

(Patrick José Pereira) #2

Hi Igor,

  1. Go to to access the companion terminal.
  2. Check the connected devices with: v4l2-ctl --list-devices or with ls /dev/video*
    If both commands fail, please check your camera USB connection.

(Igor) #3

Hi Patrick,

I got this,

/dev/video0 /dev/video1

(Igor) #4

I imagine having this return from the terminal, it recognized the usb camera connected …

(Patrick José Pereira) #5

The problem was a mismatch between the gstreamer configuration IP and the one used by the groundstation PC.
Setting the default gstreamer parameters fixed the issue.

(Igor) #6

Ok Patrick,


(Geraldo Figueiredo) #7

Hello Patrick,
I have the same problem with Igor.

I’m testing the ROV Outland 1000 umbilical (using sonar twisted pair) with 240 meters in length on BlueRov2.

I did another test with telephony cable, twisted pair with 30 meters in length and gave the same problem.

I get all the telemetry, but I can not video.

I have tested in all modes of QGC (normal, security and compatibility) and continue without video.

The version of QGC is 3.2.4 rev6

On this test you said to do, I do not know if I typed correctly, but returned “command not found”.

What can it be?

Best Regards,


(Geraldo Figueiredo) #8


I got to read at the terminal!

Appeared “/ dev / video0”

I think you recognized the camera.


(Geraldo Figueiredo) #9

How do I do that?


(Jacob) #10

@geraldof1975 was the video ever working before you made your modifications? You should not have to adjust anything on the ROV side. Please make sure you have followed the network setup, and try the troubleshooting instructions.

(Geraldo Figueiredo) #11

Hi Patrick,

We discovered the problem!

After several tests, the problem was the USB camera that we had changed and we had only tested by connecting directly to the notebook.

Placed the original camera, it returned to work.

Thank you for your help!


(Patrick José Pereira) #12

Hi Geraldo,

Thank you for the update, but just to remember:

H.264 is the only format that is used by default in companion. It’s necessary to use compression formats to stream video to the surface, this helps to send data without shrugging with variable bandwidth, high quality images and limited hardware.

So, if the camera does not provide a H.264 format, it’ll be not recognized by companion.