SDK中sample下的audio和vdec不能同时运行

SDK中sample vdec和audio单独能正确运行
同时运行有错误，先运行audio 再运行 vdec 错误如下：
[Func]:MPI_AO_UpdateCircleBufferReadPtr [Line]:775 [Info]:Get AO(0) pub attr failed.
[Func]:MPI_AO_QueryCircleBufferReadData [Line]:709 [Info]:Get AO(0) pub attr failed
e!
[Func]:HI_MPI_AO_SendFrame [Line]:1781 [Info]:can't get aodev0's attribute!
[Func]:HI_MPI_AO_SendFrame [Line]:1781 [Info]:can't get aodev0's attribute!
[Func]:HI_MPI_AO_SendFrame [Line]:1781 [Info]:can't get aodev0's attribute!
[Func]:HI_MPI_AO_SendFrame [Line]:1781 [Info]:can't get aodev0's attribute!
EVENT: HPD
HDMI start success.
wy x = 0,y = 0,W = 1920,H = 1080
get sink caps success!
SAMPLE_TEST: stop to receive stream and  instant to enable user pic now!
SAMPLE_TEST: Disable user pic and  start to receive stream now!
SAMPLE_TEST: stop to receive stream and  delay to enable user pic now!
SAMPLE_TEST: Disable user pic and  start to receive stream now!

为什么audio会出现异常，声音消失，视频正常。为什么音频不正常呢？