ffmpeg resize down larger video to fit desired size and add padding

Question

I\'m trying to resize a larger video to fit an area that I have. In order to achieve this I calculate first the dimensions of the resized video so That it fits my area, and

Answer 1

Try this:

-vf 'scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:x=(640-iw)/2:y=(480-ih)/2:color=black'

According to FFmpeg documentation, the force_original_aspect_ratio option is useful to keep the original aspect ratio when scaling:

   force_original_aspect_ratio
       Enable decreasing or increasing output video width or height if
       necessary to keep the original aspect ratio. Possible values:

       disable
           Scale the video as specified and disable this feature.

       decrease
           The output video dimensions will automatically be decreased if
           needed.

       increase
           The output video dimensions will automatically be increased if
           needed.