OpenEars is not advised to be run simultaneously with other AV objects that heavily override the audio session settings that it needs to function. It may not be possible. However, two things you can try are to change the order in which you start the two competing objects, and/or to stop the video capture before attempting to stop OEPocketsphinxController. I’m not aware of any audio objects with audio session requirements that can be run simultaneously with other objects that override their required settings, so although this is a common request for OpenEars it unfortunately isn’t really very closely aligned with the way that audio sessions for the iPhone were designed. Therefore, there is limited assistance I can give for issues of audio coexistence, since they don’t originate with this library, but those two suggestions may help.