[MPlayer-users] mpeg2 resolution

[Nico Sabbi]

Bret Hughes wrote:

>I am working with a company that is creating movies in after effects
>that will be played back on (among other things) mplayer on linux.  One
>of the scenarios is full screen playback on 30" lcds at 1280 x 768.  The
>graphics artist tells me that the largest screen res for a mpeg2 is
>720x480.  I have surfed a bunch of stuff and did find mention of the
>main dvd mpeg2 format being defined as that but nothing that says that
>mpeg2 itself being limited in that manner. 
>
>Does anyone know?  the movies are developed at 1280x768 and I would like
>to see mpeg2s at the native resolution. 
>

as far as know mpeg1/2 can use reolutions up to 4096x4096


> Perhaps it is a limitation of
>after effects?  He gave ma a monster mov file that is about 600M for 12
>seconds but I can't seem to get mplayer to read it.  and keep confusing
>myself as I try to read the mencoder stuff to try and figure out what I
>need to do to convert it.
>
>he gave me samples of the 720X480 movies to dink with.
>
>
>And when I tell mplayer to fullscreen the mpgs I see this:
>
>VDec: vo config request - 720 x 480 (preferred csp: Planar YV12)
>VDec: using Planar YV12 as output csp (no 0)
>Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
>VO: [sdl] 720x480 => 854x480 Planar YV12  [fs]
>
>
>so now I am really confused.  
>
>why 720X 480? 
>

original resolution

> this aspect ratio is 1.5 or 6 X 4 I thought tvs were 4x3
>and movies were 16 x 9
>  
>

not always

>
>The aspect ratio of the screen is 1280/768=1.6667 or 15 x 9  Hmm no help
>
>  
>

 use -monitoraspect 15/9

>at least the pre scaling makes some sense:  845X480 = 1.779 or about 16
>X 9
>
>I have not seen it on a 30" screen yet but on a 17" 4x3 aspect monitor
>running in x at 1280 x 768 there are black bars top an bottom.  this is
>interesting to me because a browser running a flash movie at 1280X768
>fills the screen ( albiet sort of scrunched up)
>
>anyway as you can see I am looking for some guidance here.  If mplayer
>is going to prescale before passing the video to xv can I tell it to
>prescale to a 15X 9? 
>

as above

> Should I have the developer create mpeg2s at that
>ratio?
>

not necessarily

>  Are the calculations to remain in ration going to make for
>better images?
>
>I have a headache.  Please help.
>
>Bret
>
>  
>