Hi,
Recently, lot of traffic about x11grab appeared in
commandlinefu(http://www.commandlinefu.com). People posted their
commandline variants to create screencast video.
For my purpose, I also created my own variant of x11grab, here is the
commandline.
-----
ffmpeg -f alsa -itsoffset 00:00:02.000 -ac 2 -i hw:0,0 -f x11grab -s
$(xwininfo -root | grep 'geometry' | awk '{print $2;}') -r 10 -i :0.0
-sameq -f mp4 -s wvga -y outputfile.mp4
-----
And to make it simple, I also wrote a small script
-----
#!/bin/sh
# simple command to capture your screen and mic input
OUTPUT="${1:?[usage] screencast.sh OUTPUTFILE}"
getgeometry()
{
xwininfo -root |
grep 'geometry' |
awk '{print $2;}'
}
captureX11()
{
ffmpeg -f alsa -itsoffset 00:00:02.000 -ac 2 -i hw:0,0 \
-f x11grab -s $(getgeometry) -r 10 -i :0.0 \
-sameq -f mp4 \
-s wvga \
-y "${OUTPUT}"
}
captureX11
-----
This script captured my desktop as well as voice from my laptop's
in-built front mic. I'm using Debian(Testing). I'm posting this script
to see how it works in other distros. If you understand and know how to
tweek this commandline, please post your modifications.
For newcomers, to run this script, you need to install ffmpeg and ALSA.
Ubuntu/Fedora are using pulse as their audio subsystem. I don't know how
to use pulse to capture mic input. Don't try if you don't know what you
are doing. You will endup breaking your sound.
This is the first screencast I created using this script,
http://www.youtube.com/watch?v=K3gOxtXN5wc
Lets play with ffmpeg :)
Cheers,
Mohan R.
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