[MPlayer-users] DVD aspect ratio confusion

[whyohwhyohwhyoh]

On Fri, 2009-05-15 at 10:17 +0200, Nico Sabbi wrote:
> On Friday 15 May 2009 04:44:49 whyohwhyohwhyoh wrote:
> > hello,
> >
> > i'm looking for suggestions about what's causing the following and
> > what the solution might be.  the problem isn't directly related to
> > mplayer but i'm hoping that the solution might be or at least the
> > people on this list might know the answer or where else to look.
> >
> > i'm transferring some DVDs onto files so that i can stream them to
> > my PS3.
> >
> > for most DVDs, just doing...
> >
> > mencoder -oac copy -ovc copy -of mpeg -mpegopts format=dvd:lsaf
> > ....
> >
> > works fine.
> >
> > however, when i try that on my UK PAL "Spirited Away" DVD the
> > result plays stretched very wide - approx 2.3:1 - on the PS3.
> >
> > the file plays with the correct aspect ratio in mplayer.
> >
> > if plays with the stretched aspect ratio in totem (using gstreamer)
> > which gets the correct aspect ratio if it plays the film straight
> > from the DVD.
> >
> > even taking the data from the disc using tccat produces a file
> > which plays correctly in mplayer but too wide elsewhere.
> >
> > i don't even know where to look next.  if i switch on verbose
> > output in mplayer is there something i can look for in amongst all
> > that data that would give a clue?
> >
> > tia
> >
> > PS huge, massive thanks for mplayer and mencoder - richly deserving
> > of all its awards.  i've been a very happy user for many, many
> > years.  :-D
> >
> 
> some dvds have an incorrect A/R indication in the video stream itself, 
> some (recent ones) even have a pan_scan indication that is completely 
> broken. 
> You can fix that using -mpegopts :vaspect and maybe patching :vpswidth 
> and :vpsheight to 0

hi Nico, big thanks for the suggestions.

yes, i'd thought along the same lines and had tried
setting :vaspect=16/9 but it didn't make any difference.

i've just tried setting :vpswidth=0 and :vpsheight=0 but mencoder
complains that they both have to be >= 1.

thinking further about your suggestions and looking at the result, which
is a little bit more than 2.11:1 ... suppose it's 2.225:1?  that would
be the 16:9 i put in the header * 4:3 in the stream.  so if i put 4:3 in
the header the result will be 4:3 * 4:3 = 16:9 ... which is what i need.

so i put :vaspect=4/3 and it works!  output that's 16:9!

mplayer plays the resulting file 4:3 now but that's okay - i can
manually override that if i want to play it in mplayer.

do you think it's the PS3 (and totem/gstreamer) or mplayer that's being
the most technically 'correct' here?  should mplayer be playing at the
same A/R as the other things?  (and default to putting :vaspect=4/3 in
the mpegopts in this case?)

and is there a way to find out the A/R in the header and the A/R in the
stream separately to confirm what's going on?

anyway, thank you!!  now i don't have to re-encode this film!
awesome.  :-D

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