notemx

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生成的图片都是0kb

![1](https://user-images.githubusercontent.com/10363066/48668884-94ac1d80-eb32-11e8-9eef-41f71d3d653b.jpg) ![2](https://user-images.githubusercontent.com/10363066/48668885-94ac1d80-eb32-11e8-9bf3-ed67dca0c365.jpg)

生成的图片都是0kb

ffmpeg安装正确。php版本7.0 7.2都用过，system exec函数也开启了。重装了好几次生成的图片全是0kb啊 ![3](https://user-images.githubusercontent.com/10363066/48668910-0c7a4800-eb33-11e8-9643-a30f9c9c9b82.jpg)

生成的图片都是0kb

ffmpeg 2.5 3.4 4.1全部安装试过