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dm8148 下Gstreamer 调试出现could not link v4l2src0 to XXXX，什么原因？

jim.chen
Prodigy 40 points


#gst-launch v4l2src device=/dev/video4 ! 'video/x-raw-yuv,fo
rmat=(fourcc)YUYV,width=320,height=240' ! filesink location=v4l2.yuv1

WARNING: erroneous pipeline: could not link v4l2src0 to filesink0

无论是v4l2src 采集存文件或通过HDMI显示，它总是有could not link v4l2src0 to XXXXX 的错误，请给个提示？这个错误是什么原因造成的？谢谢！