Start of a "keyframe" walk. This is a special case of "normal" walk so is called in addition to the handle normal walk. Reimplemented in Impala::Core::VideoSet::BlackFrameDetect, Impala::Core::VideoSet::ExportKeyframes, Impala::Core::VideoSet::ImportAudioConcepts, Impala::Core::VideoSet::IndexAnnotation, Impala::Core::VideoSet::IndexFeatures, Impala::Core::VideoSet::IndexFeaturesSubset, and Impala::Core::VideoSet::InterestPointProc. Definition at line 58 of file Listener.h.
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