a. Install gtk-recordmydesktop
Record your first screen cast using this software
b. Install Audacity: To remove noise
Get a wav file to be used with Audacity
ffmpeg -i out.ogv out.wav
c. Merge the edited wav file with original video file(Also convert it to avi)
mencoder -audiofile out.wav -oac mp3lame -ovc xvid -xvidencopts fixed_quant=4 -o out.avi out.ogv
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