The ffmpeg is cross-platform and very powerful software to handle video/audio or to stream it. On Linux ffmpeg can capture X11 screen with a command below:
ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpeg
But is it possible to grab Windows Desktop with ffmpeg?
-f x11grab is what actually tells FFmpeg to record your screen. You shouldn't change that. -i :0.0+0,0 is where you specify the x and y offset of the top left corner of the area that you want to record. For example, use :0.0+100,200 to have an x offset of 100 and an y offset of 200.
Use the built-in GDI screengrabber (no install needed) like this :
ffmpeg -f gdigrab -framerate 10 -i desktop [output]
This will capture ALL your displays as one big contiguous display.
If you want to limit to a region, and show the area being grabbed:
ffmpeg -f gdigrab -framerate ntsc -offset_x 10 -offset_y 20 -video_size 640x480 \ -show_region 1 -i desktop [output]
To grab the contents of the window named "Calculator":
ffmpeg -f gdigrab -framerate 25 -i title=Calculator [output]
I found that framerate 10 suits screen capture well (you can change it).
I have encoded to both files and streaming outputs and it works quite well.
This will help for capturing the working screen on windows :
ffmpeg -y -rtbufsize 100M -f gdigrab -t 00:00:30 -framerate 30 -probesize 10M -draw_mouse 1 -i desktop -c:v libx264 -r 30 -preset ultrafast -tune zerolatency -crf 25 -pix_fmt yuv420p c:/video_comapre2.mp4
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