FFMPEG: How to move the video without stretching it?

问题

Please, I need help with the following ...

I want to move a video (portrait type), but without stretching it ... To create a 16: 9 video, with FFMPEG ... I have the following example ...

ffmpeg -i video.mpg -filter:v "crop=in_w-100:in_h-100:0:(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t)" -y out.mp4

回答1:

Wow, I do not know what I was thinking ... The answer was simple, indicate the HxW of the output video ...

ffmpeg -i video.mpg -filter:v "crop=1280:720:0:(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t)" -y out.mp4

But: How do I resize the background video, if I want to create a 640x360 video?

I tried to include "scale" and do some tests, but I still can NOT make the background video, also scale to 640x360. ffmpeg -i test.mp4 -filter:v "crop=640:360:0:(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t),scale=640:360" out.mp4.

Video output: https://youtu.be/TCOLbbereQU

来源：https://stackoverflow.com/questions/54526345/ffmpeg-how-to-move-the-video-without-stretching-it