add ffmpeg to docker image #63
                
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为docker镜像加入
ffmpeg文件,以便在nginx.conf中配置exec任务时使用。使用docker.io中的最大下载量的
jrottenberg/ffmpeg镜像为基础,增加ENTRYPOINT指令,修改CMD指令。docker-compose.yml文件中删除command项,直接使用镜像中的缺省命令即可。