DM365 rtsp/test-launch audio lost

Hi, I tried the gst-rtsp-0.10.7/examples on DM365-evm 

./test-launch "( alsasrc ! TIAudenc1 codecName=aaclcenc engineName=codecServer ! rtpmp4apay name=pay0 pt=96 v4l2src  input-src=composite ! video/x-raw-yuv,format=(fourcc)NV12,width=352,height=240 ! TIVidenc1 codecName=h264enc engineName=codecServer ! rtph264pay name=pay1 pt=97 )"

then use VLC rtsp://<IP>:8554/test   which worked for a while then audio buffers lost

sometimes printed out "davinci_mmc davinci_mmc.0: powerup timeout"

if I stream audio only, no lost buffers

so I guest streaming audio and video at the same time cause CPU overload and it somehow lost audio

how can I fix it?

please help, thanks