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Old 12-07-2006, 03:34 PM   #1
MikeyCarter
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mencoder to convert 16:9 -> 4:3 letterbox


I got fancy and recorded widescreen with my digital camera. But trying to get it to work right on the DVD player is proving to be a challenge.

Is there a way to get mencoder to convert the 16:9 -> 4:3 (letterbox I'm assuming is the one with the black bars on top and bottom) That way it works with all the other 4:3 videos?

I've tried transcode and ffmpeg. I get all sorts of weird things going on. My favorite is when the colour is out of sync with the object... (ie my daughter moves and her red shirt follows a second later)

mencoder seems to be converting the video the best so is there a way to drop from widescreen to fullscreen?

Michael
 
Old 12-07-2006, 04:32 PM   #2
acid_kewpie
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certainly possible, depends how you want the final image to look like as to how it's done though. if you wish to add black bands and preserve the original content completely, check the -vf expand= option in the documentation, this will allow you to increase the size of the bounding box of the image, up to a 4:3 ratio. one thing to note here is that (from what i'm aware of) image sizes should always be in multiples of 16 bits, so exactly scaling to a 4:3 ratio may break that, but a little distortion when strictly playing back to 4:3 isn't going to hurt (e.g. 4:3.12 is as good as dammit yeah?)

if you're looking to crop the sides of the image, then it's a -vf crop= operation, and you could also do a combination of both, so crop half the width down, and then expand the remaining image up to a 4:£ image, from say the resulting 14:9 image.
 
  


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