[MPlayer-users] how to evaluate ripped dvd size

[D Richard Felker III]

On Fri, Sep 13, 2002 at 07:15:17PM +0100, Chris Phillips wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > If you're really going to use this rather than manually figuring out
> > the options for each encode, you should integrate automatic crop
> > detect and cropping. Otherwise you will waste lots of bits on failed
> > motion estimation and sharp discontinuities at the image->black
> > transition lines, greatly reducing the quality. Also you should make
> > sure that the image dimensions after cropping remain multiples of 16,
> > or at least of 8.
> 
> Maybe they've added some clever auto aspect feature by now, i've not 
> really looked, last time i did i couldn't get the output to automatically 
> be the right aspect. This does seem very odd though, seeing as this 
> information is clearly used to play the dvd's in the first place. Again 
> it's a case of finding out how to get any information back out of mencoder 
> about cropping sizes if i still do need to scale it... am i meant to just 
> play the first 2 seconds to get info and then go round again?

Yeah, basically, using -vop cropdetect. Also, -vop scale can
automatically handle aspect for you if you use -1 or -2 or something
for the height, but I don't know if there's a way to make it round to
nice sizes.

Rich