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    def play(self):        conf = self.conf        prev_time = 100000        while True:            row = None            try:                self.cur.execute("SELECT * FROM playlist_clips WHERE start_at > ? ORDER BY start_at LIMIT 1",                                 (prev_time,))                row = self.cur.fetchone()                if not row:                    self.cur.execute("SELECT count(start_at) AS count FROM playlist_clips")                    row = self.cur.fetchone()                    if row['count'] > 0:                        prev_time = util.hhmmss_to_seconds(time.localtime(time.time())[3:6]) - 1                        continue                else:                    prev_time = row['start_at']            except:                pass            if not row:                time.sleep(1)                continue            curr_time = util.hhmmss_to_seconds(time.localtime(time.time())[3:6])            vobj = {                'url': os.path.join(conf.media_dir, row['file']),                'start': row['seek_start'],                'end': row['seek_length'],                }