FFmpeg 在视频顶部叠加一张图片遮罩达到如下效果该怎么做？
https://pcsdata.baidu.com/thumbnail/23a3678a2v787f10ccc3b1ad711e6a13?fid=153660668-16051585-151080324294469&rt=pr&sign=FDTAER-yUdy3dSFZ0SVxtzShv1zcMqd-c%2F1xaZQQ%2B2Ga3zXPev4RMdO7Ap0%3D&expires=2h&chkv=0&chkbd=0&chkpc=&dp-logid=2570978775&dp-callid=0&time=1610722800&size=c1600_u1600&quality=100&vuk=-&ft=videohttps://pcsdata.baidu.com/thumbnail/dad21fcffkc12f077d24fcb6660a1c2c?fid=153660668-16051585-894504190942007&rt=pr&sign=FDTAER-yUdy3dSFZ0SVxtzShv1zcMqd-5oKGFsJ89zj7Pt%2FFAuIjElfOjw4%3D&expires=2h&chkv=0&chkbd=0&chkpc=&dp-logid=2570978775&dp-callid=0&time=1610722800&size=c1600_u1600&quality=100&vuk=-&ft=videohttps://pcsdata.baidu.com/thumbnail/b7aaa95f4je6b36c411a1fd48fc1b1fa?fid=153660668-16051585-967810086219818&rt=pr&sign=FDTAER-yUdy3dSFZ0SVxtzShv1zcMqd-lqwG3V6Wy3qr1mXEDVt%2FOE33Snc%3D&expires=2h&chkv=0&chkbd=0&chkpc=&dp-logid=2570978775&dp-callid=0&time=1610722800&size=c1600_u1600&quality=100&vuk=-&ft=video请教下ffmpeg ，我想在图1视频顶部叠加图2达到图3的效果，命令如何写，谢谢！
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