= Audio Problem: Audio Drop-outs or Stutters =

[[TracNav(Sound_Problems/TOC)]]

== Symptoms ==

The audio is sounding like it's skipping some frames.

== Sample WAV File ==

See the attachment on the bottom of this page. You can hear the stutters at 2.5 second, 3.8 second, 8.8 second.

(audio file courtesy of Chen Huan <chenhuan at sict.ac.cn> who managed to convince his girlfriend to record the audio for testing :) ).


== Checklists ==
Here are the checklists related to stutters problem:
 1. [wiki:audio-check-loopback Check whether the symptom is observable when looping the microphone to the speaker locally].
 1. [wiki:audio-check-dangling-pbx-call Check that there is no dangling call in the PBX]. A dangling call is call that is left active in the PBX because previous (pjsua) application has crashed.
 1. [wiki:audio-check-packet-loss Check for network impairments of incoming RTP packets]
 1. [wiki:audio-check-cpu Check that CPU Utilization is not Too High]
 1. For Windows Mobile/WinCE, it may be necessary to set {{{PJMEDIA_SOUND_BUFFER_COUNT}}} to 32 in your {{{pj/config_site.h}}}. The default value is 16, which is fine for desktop applications. But be aware that enlarging this buffer may increase the audio delay (thanks Chen Huan for reporting this).
 1. [wiki:audio-check-underflow-overflow Check for audio underflows/overflows]