im not arguing your point ive noticed a diffrence in information to,

via ES task manger app(free in google play store)>>click>>more>>about phone>>hardware>>screen res:-480x764 and pixel density:-120 Dpi

but most stuff i have playing on mine as long as its of decent quailty originally most plays fine on my gbook

without having to convert any of the videos ive played literally all play in fullscreen even in the default player and look pretty crisp

id also recommend vlc player and mx player if your having any issues (id stick with vlc no problems so far)

you can also get a video convertor via archos anova website but as stated not had much use for it ,,