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我正在使用ffmpeg jni在android中的视频文件上添加水印,但我还没有找到任何解决方案。我正在使用这个命令 "ffmpeg -i alldone.mp4 -i cancel_bttn.png -filter_complex "overlay=main_w/2-overlay_w/2:main_h/2-overlay_h/2" record.mp4 " 但这不起作用。