Digital broadcasting platforms increasingly require mechanisms capable of understanding audience reactions while content is being delivered. However, conventional audience measurement relies primarily on delayed ratings, aggregate engagement statistics, or isolated textual sentiment analysis, limiting broadcasters’ ability to adapt content responsively. This study proposes a real-time audience sentiment analytics framework that integrates textual comments, interaction behavior, and temporal engagement signals to support adaptive and personalized media broadcasting. The proposed architecture combines a transformer-based text encoder, a behavioral feature network, temporal attention, and a contextual bandit adaptation engine. A prototype evaluation was conducted using public sentiment resources and a simulated broadcasting stream containing 120,000 audience events. The system classified audience sentiment into positive, neutral, and negative categories and translated aggregated sentiment into controlled broadcasting actions, including recommendation adjustment, segment continuation, notification timing, and presentation-style adaptation. Experimental results indicate that the multimodal model achieved an accuracy of 89.6% and a macro-F1 score of 88.9%, outperforming text-only and conventional machine-learning baselines. The prototype maintained an average end-to-end latency of 184 ms and processed approximately 1,420 events per second. In the simulated adaptive broadcasting experiment, sentiment-aware personalization improved click-through rate by 15.9%, average viewing duration by 12.8%, and audience satisfaction by 10.6% compared with static broadcasting. Fairness constraints, confidence thresholds, human editorial oversight, and privacy-preserving aggregation were incorporated to reduce the risks of emotional manipulation, bias, and unstable content adaptation. The findings demonstrate that real-time sentiment analytics can provide a technically effective foundation for responsive broadcasting when deployed as a decision-support mechanism rather than an autonomous editorial authority.