FFMPEG Command to Resize & Scale Video to (640×480) (1920×1080) Without Losing Aspect Ratio (16:9) on Command Line

 

 

For example:

1920×1080 aspect ratio 16:9 => 640×480 aspect 4:3:

aspect ratio 16:9 , size width 640pixel => height 360pixel:
With final output size 640×480, and pad 60pixel black image (top and bottom):

 

 

 

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