求助3520sample_audio

3520 的板子，运行sample_audio会出现这个，有没有同样遇到这个问题的解答一下
#
#
# ./sample_audio

func(SAMPLE_CX26828_SetSmprate) line(313): set cx26828 sample rate(8000) ok
func(SAMPLE_CX26828_SetFormat) line(259): set CX26828 audio format(1) ok!
func(SAMPLE_CX26828_SetBitwidth) line(357): set cx26828 bit width(1) ok
func(SAMPLE_CX26828_SetChnNum) line(386): set cx26828 chn num(2) ok
AEC_Init error framelen(320)
[Func]:MPI_AI_AecInit [Line]:369 [Info]:aec open fail.
AEC_Init error framelen(320)
[Func]:MPI_AI_AecInit [Line]:369 [Info]:aec open fail.
Ai(0,0) bind to AencChn:0 ok!
open stream file:"audio_chn0.g711u" for aenc ok
bind adec:0 to ao(0,0) ok

please press twice ENTER to exit this sample
SAMPLE_COMM_AUDIO_AencProc: get aenc stream select time out