Error Can't open display :1

[cspaier]

Hi,
Trying your script I had the following error: Can't open display :1

Running xrandr would raise the exact same error.

I don't know much about all that but trying around I fixed it adding DISPLAY=:0.0 before the xrandr commands.

Just sharing in case someone face the same issue. Maybe there is a proper fix to be done.

Here is my script:

#!/bin/bash

# echo "Probing v4l2-loopback"
sudo rmmod v4l2loopback 2> /dev/null
sudo modprobe v4l2loopback video_nr=7 'card_label=myFakeCam'

DISPLAY=:0.0 xrandr --listactivemonitors
read -p "Which monitor you want to share: " MON_NUMBER

MON_PARSE=`DISPLAY=:0.0 xrandr --listactivemonitors | grep "$MON_NUMBER:" | cut -f4 -d' '`
MON_HEIGHT=`echo $MON_PARSE | cut -f2 -d'/' | cut -f2 -d'x'`
MON_WIDTH=`echo $MON_PARSE | cut -f1 -d'/'`
MON_X=`echo $MON_PARSE | cut -f2 -d'+'`
MON_Y=`echo $MON_PARSE | cut -f3 -d'+'`

# ffmpeg -f x11grab -r 20 -s 1920x1080 -i :0.0+0,0 -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video7
ffmpeg -f x11grab -r 20 -s "$MON_WIDTH"x"$MON_HEIGHT" -i :0.0+"$MON_X","$MON_Y" -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video7

[jeisoncp]

I had a similar error:

[x11grab @ 0x5570a782b2c0] Cannot open display :0.0+0,0, error 1.
:0.0+0,0: Input/output error

[cspaier]

I think you need to figure out what your display number is and add it like that DISPLAY=:x before the xrandr commands.

[mattiasghodsian]

Same issue here, didn't help adding DISPLAY=:

[JohnXLivingston]

Should be fixed by: #16