java FFmpegFrameGrabber 流媒体实时播放问题

FrameGrabber grabber = new FFmpegFrameGrabber(cacheFile);
grabber.start();// 开启抓取器

报错：
org.bytedeco.javacv.FrameGrabber$Exception: avformat_open_input() error -1094995529: Could not open input "/tmp/D-DT0056-6". (Has setFormat() been called?)

怎么解决