ffmpeg x11grab a single window
Solution 1
AFAIK it's not possible to capture a specific window with ffmpeg, the x11grab entry in the manual only refers to screens https://www.ffmpeg.org/ffmpeg-devices.html#x11grab and it suggests that the region you specify is static (if you move the window ffmpeg does not follow it):
However GStreamer offers some more flexibility in this case:
gst-launch-1.0 ximagesrc xid=0x04000007 ! videoconvert ! autovideosink
This works with out-of focus windows and you can even move them but it does NOT work with minimized windows.
As you may know, you can get the window id with wmctrl -l
.
You can see the options supported by GStreamer elements using the gst-inspect-1.0
program, e.g.:
gst-inspect-1.0 ximagesrc
Solution 2
I do not know if it was possible when this question was asked long time ago, but for the sake of completeness I had now success with:
ffmpeg -f x11grab -framerate 25 $(slop -D -f '-video_size %wx%h -i +%x,%y') out.mp4
Having slop
installed makes this much easier, but the coordinates can also entered by hand of cause. It is then something like -video_size 640x480 -i +0,100
to capture a 640x480
sized video with the topper left corner in position x=0 and y=100 (screen coordinates). The -i [X],[Y]
syntax is not really intuitive.
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Updated on September 18, 2022Comments
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Admin almost 2 years
Is it possible with ffmpeg grab a window that is minimized or that not has the focus (there is another window over but ffmpeg records only the window which is below)?
With a command like
ffmpeg -f x11grab -r 30 -i :0.0+x,y -f flv rtmp://url
? -
larsks over 3 yearsThis appears to be capturing a specific area of the screen, rather than a particular window (meaning if you move the window, you'll now be recording whatever was behind the window).
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user298427 over 3 yearsI have improved my answer and added the -D flag to slop. It allows a double click on a window and was introduced nine month ago in github.com/naelstrof/slop/commit/…
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rkachach almost 3 yearsThis answer assumes that you have graphics env which could not be always the case.