ffmpeg 错误 real-time buffer [USB2.0 Camera] [video input] too full or near too full (101% of size: 30

利用ffmpeg 获取USB 或者本地摄像机视频，并将视频编码后保存本地文件或者发送到远端流媒体服务经常会出现 类似real-time buffer [USB2.0 Camera] ...