I tried searching, but couldn't find what I was looking for. I'm looking for a way to know what the correct resolution to downscale is after cropping. For example I have a 1920x1080 bluray with the black bars cropped off it comes out as 1920x1036. How would I go about figuring out the correct/closest 720p resolution to downscale to as well as 480p.
+ Reply to Thread
Results 1 to 5 of 5
Thread: Cropped Downscale Resoltuion
It's just a matter of using the source video dimensions after cropping and the desired width after resizing to calculate the new height. Normally you'd use a width of 1280 for 720p and a width of 720 (or less) for 480p. So......
As an example, if you were take a 1920x1080 video, crop 4 pixels from the sides and a total of 80 pixels top and bottom, then re-size to a width of 1280, it'd be:
(1000/1916)*1280=668, giving you 1280x668
To convert your example to 480p using a width of 720:
(1036/1920)*720=388, giving you 720x388
Or if you want to play with the cropping and resizing to minimise any aspect ratio distortion, try using this calculator. It saves having to keep doing the math. http://www.mediafire.com/?09v9bldu9a6hm00
Thanks! that calculator does the job perfectly
Or scale first, crop second.