4k-vfx Maps a video-to-video VFX move onto the Pika MCP's Seedance 4K reference-to-video . The user hands you a clip + the change they want; you read EVERY frame (locally extracted with ffmpeg and tiled into contact sheets) and understand the audio (speech + music + SFX + ambience), author a Seedance-faithful prompt that locks the original (face, gestures, camera move) and time-codes the change to the right beat, then re-render the same shot in 4K with the VFX baked in. One run produces one 4K clip for one requested change. How it works — why reading EVERY frame (and the audio) is the mechani…