[Bug 680904] wavparse src can not link to audioconvert when using USB sound card

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=680904
  GStreamer | gstreamer (core) | 0.10.36

--- Comment #24 from soho123.2012 at gmail.com 2012-08-08 03:53:26 UTC ---
Hi Tim, 


from the log data, 

I can see the wavparse caps is :
riff-media.c, gst_riff_create_audio_caps, 1766, caps=0x47c420, len=1
wavparse src CAPS: audio/x-raw-int, endianness=(int)1234, channels=(int)2,
width=(int)16, depth=(int)16, signed=(boolean)true, rate=(int)48000

but when pavparse start to parse wav data, try to link to audioconvert sink, 
it can not find the suitable caps, 
the cause is "EMPTY", 

the reason of EMPTY:
caps1->flags & GST_CAPS_FLAGS_ANY==NULL
caps1->structs->len=0


I do not know why the caps found to link to wavparse:src is EMPTY?

Do you have idea?
As my understanding, 
the caps found to link to wavparse:src should include some data, 
like 
mime type,
endianness,
channels,etc.....
why it is empty?

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