Color conversion can be done directly by hwa742 chip. Would be nice to have more documentation about it though. I already wrote to email mentioned here
http://www.erd.epson.com/vdc/html/contents/S1D13742.htm but got no answer (no surprise :-).

Also I'm not sure but it looks like DSP doesn't send video to epson chip. It only draws it to shared framebuffer which is then send to the chip by kernel omapfb driver from videoplayer code. So if DSP doesn't decode mp4 video there is no reason to use it for other video steps since there is in fact nothing left to do.

DSP tools are free
http://www.gossamer-threads.com/list...pers/3938#3938

gstreamer is probably the right way to go (ffmpeg or other plugin using main cpu) but it doesn't mean patched mplayer is not useful. Currently it is not very clear how to display video with gstreamer on device (preferably also pixel doubled).