[ubuntu-uk] Screencast a presentation with Impress and webcam

[James Morrissey]

Hi all,

Having asked this question, i thought i'd just provide an account of how i
solved this in case anyone finds it useful.

In the end used a friend's Nikon camera with video capabilities and
captured a video of me giving the talk - i opted for the camera because my
webcam was too grainy although i could have done it using guvcview. I then
used ffmpeg to capture a screen cast of the impress presentation, running
in full screen mode on another workspace/ To do this i used the audio from
the Nikon video for the audio prompts so i knew when to do things like
start slide animations and change slides.

ffmpeg command:

ffmpeg -f x11grab -r 30 -s 1360x768 -i :0.0 -vcodec huffyuv -sameq
screencast.avi

I initially tried to generate the picture in picture effect using kdenlive (
http://www.kdenlive.org/tutorial/kdenlive-picture-picture-transition), but
was having rendering problems. I heard that this was a well known problem
and that a solution was to make your project in kdenlive and export it to
OpenShot, where you could then render it. Doing that i found out that open
shot also had picture in picture capabilities (
http://www.youtube.com/watch?v=4oZwOVoYsUI), and so i actually ended up
doing the whole project in that.

I even went so far as to add some effects, to change the size of the one
picture in the other at different points in the talk. This was done, by
splitting a clip and altering the size of the image at the start and the
end of the clip.

It was all a bit of a fiddle but it worked out in the end. Conference
happened last night in Australia and the video went off without a hitch.

Thanks for all the advice that different people gave me.

All the best,

James.


www.peliteracy.org
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