I need help on api <gst_parse_launchv>

[Yang, Xiaotao (X.)]

Hi:
               I have a question on gstreamer api< gst_parse_launchv>,
Why I start gstreamer to play a mp4 file at the first time, the elapsed time for this interface is 500ms?
But at the following time I start it again(for the second time, third time, and so on) , the elapsed time is just less than 200ms, what's the reason?
                I 'll appreciate it very much if you could help me.
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