support reverse playback by negative rates such as -1,-2,-4??

[zwresh]

it seems that the gstreamer can't support to reverse playback by negative playback rates such as  -1,-2,-4.

The arguments I set in gst_element_seek are as below.
        gst_element_seek (pipeline,
                                        -2.0 ,
                                       GST_FORMAT_TIME,
                                       GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
                                       GST_SEEK_TYPE_SET,
                                       0,
                                       GST_SEEK_TYPE_SET,
                                       cur_pos);
-- cur_pos is the position from where i want to seek.

Can anybody help me ???

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