How to start playing from the middle of a movie

[watanabe]

Dear all, 

I want to play a matroska movie file from the middle of the movie on
Android.
So I made a pipeline and tried to seek to the position I want to start just
after the state became GST_STATE_PLAYING.
But I have a problem that it seems to be shown the frame 0 (the first frame)
of the movie just before displaying the movie at position I want to start.
I tried to set show-preroll-frame property of sink to false, but it was not
worked.
Are there good ideas to avoid it?

My pipeline is:
filesrc ! matroskademux ! avdec_h264 ! tee name=t ! queue ! videoconvert !
autovideosink t. ! queue ! jpegenc ! appsink

I used a method below to seek:
gst_element_seek (pipeline, rate, GST_FORMAT_TIME,
                  (GstSeekFlags)(GST_SEEK_FLAG_FLUSH |
GST_SEEK_FLAG_ACCURATE),
                  GST_SEEK_TYPE_SET, seek_pos, GST_SEEK_TYPE_NONE,
GST_CLOCK_TIME_NONE);

Regards,




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