Systems, methods and programmed products for using visual information in a video stream of a recording streaming teleconference among a plurality of participants to diarize speech, involving obtaining respective components of the teleconference including a respective audio component, a respective video component, respective teleconference metadata, and transcription data, parsing components into speech segments, tagging speech segments with source feeds, and diarizing the teleconference so as to label the speech segments based on neural network or heuristic analysis of visual information.