SkyReels V4 is an AI video generation system built to produce cinematic clips with native synchronized audio. It combines a dual-stream MMDiT architecture with a shared text encoder to align visuals, speech, effects, and background music in one pipeline. The model supports five input modes: text, image, video clip, binary mask, and audio reference. It can generate 1080p video at 32 FPS, perform region-level inpainting, preserve character identity across shots, and create multilingual lip-sync. Beat-aware camera cuts make it especially useful for music-driven and short-form social content. The result is a production-oriented tool for fast, consistent, audio-rich AI video creation.