Null caps is returned by id3demux when query caps from it.

Submitted by zma..@..il.com

Link to original bug (#728312)

Description

Created attachment 274414
the log file that query caps.

Hi:

I have an mpeg2 file which has some id3_v1 data in the end of file, when i tried to play the file with playbin, an id3demux was created ahead of my demux. as no caps event was send from id3demux, i tried to query the caps from the peer pad of sink pad in my demux to load library for particular file type. however, Null caps is returned from id3demux.  
I have checked the gst_tag_demux_pad_query() in gsttagdemux.c and I wonder why it does not handle GST_QUERY_CAPS and return the caps of sink pad.  

Here is my log and the command line is   

gst-launch-1.0 playbin uri=file:///home/root/temp/TestSource/10Mbps/Demo1.MPG

Look forward to your reply.  

Ming,

Attachment 274414, "the log file that query caps.":
log.txt

Version: 1.2.3