[SOLVED] Video aspect ratio and scale

GPGAgent · 09-09-2020, 05:13 PM

Why is a 4:3 (1.3333) aspect ratio dvd have a scale of 720x576 (1.25)?

When I take this video and use ffmpeg to create images I have to specify scale=720:540 like this

Code:

ffmpeg    -i x.VOB   -vf "fps=1/3,scale=720:540"  IMAGES-%05d.png

If I don't the images are slightly incorrect and you can easily see this.

dugan · 09-09-2020, 06:20 PM

Short answer is that the video formats use nonsquare pixels.

Long answer is... rabbit hole. Here's one link.

http://www.miraizon.com/support/info_aspectratio.html

GPGAgent · 09-10-2020, 12:29 PM

Quote:

Originally Posted by dugan

Short answer is that the video formats use nonsquare pixels.

Long answer is... rabbit hole. Here's one link.

http://www.miraizon.com/support/info_aspectratio.html

Nice page and explanation - thanks