downstream can't keep up and is consuming samples too slowly

I have successfully integrate NativeDemo for IOS. but while running i was faced following issue. so my video is not running smooth. Here i get warning like below.

I have Tested App on iPod 5( IOS 8.3) and iPhone 5S (IOS 8.3)

==== Warning message start ====
Warning in element audio-source.
Warning: Can't record audio fast enough
Debugging info: gstaudiobasesrc.c(866): GstFlowReturn gst_audio_base_src_create(GstBaseSrc _, guint64, guint, GstBuffer *_) (): /GstPipeline:local-audio-capture-source-bin-1/GstOsxAudioSrc:audio-source:
Dropped 5733 samples. This is most likely because downstream can't keep up and is consuming samples too slowly.
==== Warning message stop ====

Can any one help me