ffmpeg命令参数详解
http://linux.51yip.com/search/ffmpeg
ffmpeg图片加滤镜效果
参考:https://cloud.tencent.com/developer/article/1413085
FFMPEG指令
参考:https://cloud.tencent.com/developer/article/1072264
https://www.jianshu.com/p/049d03705a81