Licode videoScreen recording of bad quality

Hi All,

I am implementing desktop video recording using licode and but VP8 is giving a bad quality of recorded mkv files.
Bad Quality I mean : suppoose in in a work file I am movingh around the page , onec I stop moving on a page , the text and picture is flickering for 2 secounds and than stays clear.

So I am planning to record against h264, I made changes in, rtp_media_config_default , but its not taking h264 and recording ?

Any where i am missing