In the rapidly evolving Internet of Things (IoT) landscape, seamless multimedia communication is vital for applications such as smart cities, wearables, transportation, and healthcare monitoring. However, the inherent heterogeneity and resource constraints of IoT devices, such as limited processing power, memory, and bandwidth, present significant challenges for reliable and efficient multimedia transmission. This work introduces an integrated cross-layer protocol designed to address these challenges, enhancing multimedia communication across IoT networks. The proposed protocol leverages an advanced mathematical model to optimize various aspects, including data packetization, adaptive modulation and coding, channel access mechanisms, and quality-of-service (QoS) provisioning. A cross-layer design coordinates the physical, data link, and application layers to ensure intelligent resource allocation and dynamic adaptability to changing network conditions. Extensive simulations under diverse IoT scenarios validate the protocol’s effectiveness, showing substantial improvements in throughput, latency, energy efficiency, and video quality compared to existing solutions. The protocol also demonstrates robustness and scalability, making it suitable for various IoT deployments. The integrated cross-layer protocol offers a promising solution to the challenges of IoT-based multimedia communication. By combining a comprehensive mathematical framework with rigorous performance analysis, this work sets a foundation for future advancements in IoT multimedia applications, enhancing user experience and enabling a truly interconnected IoT ecosystem.