关于gstreamer中pcapparse插件的用法问题

dlw2005

我用gstreamer分析一个已经抓下来的包，语句是

1. gst-launch-0.10 filesrc location="1.pcap" ! pcapparse src-port=80

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得到了如下的信息：

1. Setting pipeline to PAUSED ...
   
2. Pipeline is PREROLLED ...
   
3. ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data flow error.
   
4. Additional debug info:
   
5. gstbasesrc.c(2582): gst_base_src_loop (): /GstPipeline:pipeline0/GstFileSrc:filesrc0:
   
6. streaming task paused, reason not-negotiated (-4)
   
7. ERROR: pipeline doesn't want to preroll.
   
8. Setting pipeline to PAUSED ...
   
9. Setting pipeline to READY ...
   
10. Setting pipeline to NULL ...
    
11. Freeing pipeline ...

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是由于少装了文件，还是用法有问题，请各位大侠指点