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dm368用gstreamer的命令行进行音视频编码时错误



使用命令行如下:

gst-launch -v v4l2src ! TIVidenc1 ! queue ! muxer.alsa
src ! TIAudenc1 ! queue ! avimux ! filesink location=out.avi

打印错误如下  
WARNING: erroneous pipeline: link without source element

请问是什么原因呢   是命令行的格式不对吗