CrunchBang Linux

Joe90

#! Junkie

Registered: 2013-10-10

Posts: 337

[SOLVED] Capture Video of Desktop on 2nd Screen

I have a nice command to capture a video of my desktop/s.  (ffmpeg is compiled with x11grab)

I have two screens, main to the left, secondary to the right, a continuation of main.

If I run:

ffmpeg -f x11grab -s `xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -r 25 -i :0.0 ./Desktop/mydesktop.mkv

I get a video of both screens as one, with a size of 3840x1080 

If I run

ffmpeg -f x11grab -s 1920x1080 -r 25 -i :0.0 ./Desktop/mydesktop1.mkv

I get my main screen

How would I do a screen video capture of my secondary screen only? (e.g from 1921-3840)

Last edited by Joe90 (2015-01-19 02:04:47)

Sector11

#!'er to BL'er

From: SR11 Cockpit

Registered: 2010-05-05

Posts: 15,667

Website

Re: [SOLVED] Capture Video of Desktop on 2nd Screen

A really wild guess on my part since I only have one screen and don't have ffmpeg is compiled with x11grab

ffmpeg -f x11grab -s 1921x3840 -r 25 -i :0.0 ./Desktop/mydesktop2.mkv

Let me know.

Edit: mydesktop2.mkv

Last edited by Sector11 (2015-01-18 23:20:21)

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Unia

#! Octo-portal-pussy

From: The Netherlands

Registered: 2010-07-17

Posts: 4,634

Website

Re: [SOLVED] Capture Video of Desktop on 2nd Screen

^ Probably want that to be "1921x1080" 

That's not going to work though, as you'll need offset of x-coördinate + 1920x1080. I'm not sure how to specify this. The offset should obviously be 1921, but again: not sure how to specify it.

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tknomanzr

#! Die Hard

From: Heavener, OK

Registered: 2014-12-09

Posts: 777

Re: [SOLVED] Capture Video of Desktop on 2nd Screen

this may help. The o.o specifies the display, +x,x specifies offset as below:

0.0 is display.screen number of your X11 server, same as the DISPLAY environment variable.

ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg

Link to manual

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Joe90

#! Junkie

Registered: 2013-10-10

Posts: 337

Re: [SOLVED] Capture Video of Desktop on 2nd Screen

Figured it out, in fact I appear to have answered something similar to this on another forum @ 3 years ago, must be my age!

The screen size is the same as in the second example: "-s 1920x1080", but as tknomanzr rightly points out, I needed an x coordinate after the display section:    :0.0+1920,0.

Full code for secondary screen capture:

ffmpeg -f x11grab -s 1920x1080 -r 25 -i :0.0+1920,0 ./Desktop/mydesktop1.mkv

Thanks for the help guys