Aspects include adding text captioning to a video conference. Multiple conferencing endpoints participate in a video conference. An endpoint locally captures an audio stream and transcribes human speech included in the audio stream into a caption stream. The endpoint can multiplex the caption stream with the audio stream and/or with a captured video stream into a transport stream. The endpoint sends the transport stream to the one or more other conferencing endpoints. To increase reliability and effectiveness, the conferencing endpoint can send the caption stream redundantly. A receiving endpoint can receive and demultiplex the transport stream. The receiving endpoint can coordinate output of the caption stream, the audio stream, and the video stream at corresponding output interfaces.