great, thanks. and I figured out how to play what I want: 480x640 full screen landscape on 6k. I'm slow please bear with me if you've already known this.
This might/should be 6k specific
Advanced options
options for maplyer: -vf rotate=1,scale=480:640
gives me the desired result
selecting "scale to screen" = passing "-fs" to the mplayer, vedio playback is still 320x240 or 240x320
btw, mplayer_1.0.1-1 is available on atty.jp , haven't benchmarked against 1.0.0-1 myself.