[mythtv-users] Calculating aspect ratios for DVDs

Scott Alfter scott at alfter.us
Fri Jan 8 21:00:32 UTC 2010


On 7 Jan 10 09:24, Yan Seiner wrote:
> So to get the proper aspect, one would have to:
>
> Take the DVD size, either 720x480 or 720x576, and figure out the crop box.
>
> Take the reported DVD aspect ratio, divide by 1.33, multiply the width of
> the crop box and divide the result by the height of the crop box.
>
> This seems weirdly byzantine and possibly inaccurate.  Is there some
> simple way to use mplayer, lsdvd, or dvdscan to get this information?

mplayer -vf cropdetect usually does a pretty good job finding 
letterbox/pillarbox dimensions.  The numbers it produces can be fed back into 
mplayer or mencoder (-vf crop=...) or can be fed into other software for 
playback or transcoding.

Scott Alfter
scott at alfter.us


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