rescale with ffmpeg but keep the pixel density constant

Question

I have a 1280x720 video resolution After I resized the video output was blurred more than the original video How to output video is clearer

Answer 1

There is no pixel density for a media displayed on a electronic display.

The physical space occupied by a video depends on

• physical size of the display
• display's current resolution
• window size of the video player

A video when rescaled to a higher resolution will lose sharpness.