[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 #25 from soho123.2012 at gmail.com 2012-08-08 09:22:36 UTC ---
Hi Tim,


I trace to in advance, 
the log
=========================================================================
gstutils.c, gst_element_get_compatible_pad, assign temp to intersection
gstutils.c, gst_element_get_compatible_pad, call gst_pad_get_caps_reffed
gstpad.c, gst_pad_get_caps_unlocked, dispatching to pad (audioconvert0:sink)
getcaps function
gstpad.c, gst_pad_get_caps_unlocked, dispatching to pad(alsasink0:sink) getcaps
function
gstbasesink.c, gst_base_sink_pad_getcaps, pad(alsasink0:sink), Returning caps
0x4a5760
gstbasesink.c, gst_base_sink_pad_getcaps, result CAPS:
>From gst_base_sink_pad_getcaps return: EMPTY
gstpad.c, gst_pad_get_caps_unlocked, pad(alsasink0:sink) getcaps returned
0x4a5760
gstpad.c, gst_pad_get_caps_unlocked, result CAPS:
>From gst_pad_get_caps_unlocked return: EMPTY
gstpad.c, gst_pad_get_caps_unlocked, pad(audioconvert0:sink) getcaps returned
0x4a5660
gstpad.c, gst_pad_get_caps_unlocked, result CAPS:
>From gst_pad_get_caps_unlocked return: EMPTY
===========================================================================
from gst_base_sink_pad_getcaps() return the caps is EMPTY for 
both alsasink0:sink and audioconvert0:sink
such that the caps is EMPTY.

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