How to segment seek in dynamic pipeline

[xmufzy]

If we can do 2 segment seek for the element


pipeline change  :
filesrc(backgroup.mp4) --> qtdemux --> h264dec --> queue --\
                                                                                         
--> mixer -->x264enc --> filesink
filesrc(fga.mp4) --> qtdemux --> h264dec -->queue ---------/

if I need mix fga.mp4 3~8s, and backgroup.mp4 9~14s, I try to use 2
gst_element_seek(SEGMENT)  for that, but failed




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