The Multimodal Information Based Speech Processing (MISP) 2025 Challenge: Audio-Visual Diarization and Recognition

Meetings are a valuable yet challenging scenario for speech applications due to complex acoustic conditions. This paper summarizes the outcomes of the MISP 2025 Challenge, hosted at Interspeech 2025, which focuses on multi-modal, multi-device meeting transcription by incorporating video modality alongside audio. The tasks include Audio-Visual Speaker Di-arization (A VSD), Audio-Visual Speech Recognition (A VSR), and Audio-Visual Diarization and Recognition (A VDR). We present the challenge's objectives, tasks, dataset, baseline systems, and solutions proposed by participants. The best-performing systems achieved significant improvements over the baseline: the top A VSD model achieved a Diarization Error Rate (DER) of 8.09%, improving by 7.43%; the top A VSR system achieved a Character Error Rate (CER) of 9.48%, improving by 10.62%; and the best A VDR system achieved a concatenated minimum-permutation Character Error Rate (cpCER) of 11.56%, improving by 72.49%.