rendering problem

Hi all

i have a video that i make it with GTK-recordMyDesktop and the quality of it is very good.
I'd like to render it with size 800x600 so i make a custom setting for it

format=mpeg video_rc_min_rate=0 video_bit_rate=12000000 audio_bit_rate=384000 frequency=48000 size=800x600 progressive=1

OR

format=avi vcodec=rle video_rc_min_rate=0 video_bit_rate=4000000 audio_bit_rate=384000 frequency=48000 size=800x600 progressive=1

but unfortunately the result is very bad in quality in both custom setting above and display shake badly.
is there any extra setting to make shakes off.

Thanks

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