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crop a dual monitor desktop screencast recording in Linux using mencoder

I used the Linux screencasting software RecordMyDesktop to make a screencast in a dual monitor environment.

Here's how I extracted out the relevant portion of the desktop screencast video.

How to crop a video using mencoder and Linux.

I could not enable RecordMyDesktop to record a screencast of set dimensions of 1900x1000 from 3840x1080 of the total desktop dimension.

I resolved this issue by post processing the resultant screencast video, 3840x1080, using the mencoder software tool.

I extracted the pertinent content dimensions of 1900x1000 at an offset of 1921x10 from the left and from the top or the display of a total size of 3840x1080.

Using mencoder to extract 1900x1000 from a video of dimensions of 3840x1080 from an offset position of 1921x10.

mencoder out-2.ogv -vf crop=1900:1000:1921:10,harddup -ovc xvid -xvidencopts bvhq=1:chroma_opt:quant_type=mpeg:bitrate=658:pass=2 -oac copy -o cropped.mp4

[ total screen size: 3840x1080 ]
The "crop=1900:1000:1921:10" argument to mencoder does the following:

1900:1000 resultant output video dimension will be 1900x1000.

1921:10 extract video from x pixels from the left and y pixels from the top

[ to install mencoder ]
sudo apt-get install mencoder


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