Do not use format string "%0.3f" for RTSP Range field.

The format string was locale-depending.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libavformat/rtspdec.c

@@ -60,8 +60,9 @@ static int rtsp_read_play(AVFormatContext *s)
             cmd[0] = 0;
         } else {
             snprintf(cmd, sizeof(cmd),
-                     "Range: npt=%0.3f-\r\n",
-                     (double)rt->seek_timestamp / AV_TIME_BASE);
+                     "Range: npt=%"PRId64".%03"PRId64"-\r\n",
+                     rt->seek_timestamp / AV_TIME_BASE,
+                     rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
         }
         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
         if (reply->status_code != RTSP_STATUS_OK) {