gstreamer failed with fdkaac

Hi everyone,
Today I try to test fdkaac gstreamer plugin on Jetson TX1 with
Encoder

gst-launch-1.0 audiotestsrc ! audioconvert ! 'audio/x-raw, format=(string)S16LE, rate=(int)48000, channels=(int)2' ! fdkaacenc ! mpegtsmux ! udpsink host=$CLIENT_IP port=5000

Decoder

gst-launch-1.0 udpsrc port=5000 ! tsdemux ! fdkaacdec ! audioconvert ! alsasink device=aux_plug -e

But I got the the error on decoder side

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
WARNING: from element /GstPipeline:pipeline0/GstTSDemux:tsdemux0: Delayed linking failed.
Additional debug info:
./grammar.y(510): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstTSDemux:tsdemux0:
failed delayed linking some pad of GstTSDemux named tsdemux0 to some pad of GstFdkAacDec named fdkaacdec0
ERROR: from element /GstPipeline:pipeline0/GstUDPSrc:udpsrc0: Internal data stream error.
Additional debug info:
gstbasesrc.c(2939): gst_base_src_loop (): /GstPipeline:pipeline0/GstUDPSrc:udpsrc0:
streaming stopped, reason not-linked (-1)
EOS on shutdown enabled -- waiting for EOS after Error
Waiting for EOS...

Are there any body got the same problem? Or some one can give me some suggestion?
Thank in advance.
P.S.: I tested with faac and faad, it works normally but not fdkaac

It is a pure gstreamer pipeline and no NVIDIA plugins are linked. Please post in http://gstreamer-devel.966125.n4.nabble.com/ to get further help. Experts there are more experienced in gstreamer frameworks.

Thank DaneLLL,
I will move this topic to other forums