it takes longer time to generate thumbnail by gstreamer enginee than before

[donald]

On gstreamer-dbus-media-service v0.1.17, moblin media v0.36, enalbe thumbnail creating. it takes longer time to generate thumbnail by gstreamer enginee than before.

steps:
1. enalbe thumbnail creating, which is currently disabled by default.
2. enalbe gstreamer enginee and disable helix enginee
3. put video file under media/video
4. launch moblin media video application, waiting thumbnail shows for each videos

current result
 it takes about 3s to show a thumbnail, much longer than before.

root cause found, file this bug for tracking purpose, according to rusty's suggestion.

[donald (donald-wei)]

attach root cause,

At line 118 in function __seek_for_frame, should follow a "break", one frame is enough for thumbnail creating. Otherwise repeat 5 times.
--------------------------------------------
        for location in frame_locations:
            abs_location = int(location * duration)
            event = self._pipeline.seek(1.0, gst.FORMAT_TIME,
                                        gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_KEY_UNIT,
                                        gst.SEEK_TYPE_SET, abs_location,
                                        gst.SEEK_TYPE_NONE, 0)
            if not event:
              raise VideoFrameError("Not Seekable")

            if not self.set_state_blocking(self._pipeline, gst.STATE_PAUSED):
                raise VideoFrameError("Not Pausable")
            frame = self._sink.get_current_frame()
            img = Image.frombuffer("RGB", sink_size, frame, "raw", "RGB", 0, 1)
--------------------------------------------