I found that question quite interesting. On YouTube I found some Vega Strike videos, but no commented tutorials.
I had a look how I could accomplish something like that, and here's a small "Howto create Vega Strike screencasts on Linux":
First you need software that can capture OpenGL, like glc.
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$ glc-capture -o vegastrike.glc vegastrike
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$ glc-play vegastrike.glc -y 1 -o vegastrike.y4m
$ glc-play vegastrike.glc -a 1 -o vegastrike.wav
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$ gvim commentary.txt
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$ espeak -w commentary.wav <commentary.txt
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$ sox -c2 commentary.wav commentary.sox.wav rate 44100 speed 0.5
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$ sweep vegastrike.wav
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$ mencoder -demuxer y4m vegastrike.y4m -ovc lavc -audiofile vegastrike-c.wav -oac mp3lame -o vegastrike-c.avi
http://www.youtube.com/watch?v=5Hf1KF4LH2g
For now I refrained from listing this screencast on YouTube - would it be alright to do so, and make it publically available?
And/or would you like me to add the above screencast howto to the wiki?
Cheers,
n.