ffmpeg resize and scale
ffmpeg缩小视频尺寸 | 楚盟博客 https://www.5yun.org/13126.html
ffmpeg -i test.mp4 -s 480×360 out.mp4
常用分辨率:
1080P=1920*1080
720p=1280×720
480p=720X480
360p=480×360
240p=320X240
ffmpeg-resize and scale - CSDN博客 https://blog.csdn.net/rootusers/article/details/41648297