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dm368+tvp5150一直出中断

Other Parts Discussed in Thread: TVP5150, TVP5151

现在用5150采集pal视频,使用sdk的encode例程,接入摄像头可以正常工作,压缩后的文件可以正常播放。但是不接摄像头时,vpfe_capture也一直出中断,串口打印信息也是显示每秒25帧,每秒5k的数据量,我看了一下数据,应该是每帧数据添加的帧格式信息。如果我用ctrl+c关闭encode,再重新运行encode,这样就没有中断了,帧率也是0了,请问是什么原因呀?