PreferenceSpecifiers Type PSToggleSwitchSpecifier Title Automatically start video Key start_video_preference DefaultValue Type PSToggleSwitchSpecifier Title Automatically accept video Key accept_video_preference DefaultValue Type PSToggleSwitchSpecifier Title Show self view Key self_video_preference Title Codecs Type PSGroupSpecifier DefaultValue Key mp4v-es_preference Title mpeg4 Type PSToggleSwitchSpecifier DefaultValue Key h264_preference Title h264 Type PSToggleSwitchSpecifier DefaultValue Key vp8_preference Title VP8 Type PSToggleSwitchSpecifier