PROMPT = (
    "Analyze the video and produce a structured annotation for perceptual quality, visual complexity, and basic scene context. "
    "Focus primarily on observable visual properties such as motion, texture, color, and quality. Prefer accurate and stable labels over detailed but uncertain descriptions. "
    "Keep semantic description minimal and only include clearly visible information. "
    "Return ONLY valid JSON (no markdown, no code fences, no extra text) with exactly these keys and value types:\n"
    "{\n"
    ' "summary": string,'
' "dense_caption": string,'
' "motion_level": string,'
' "motion_variability": string,'
' "texture_complexity": string,'
' "edge_density": string,'
' "color_richness": string,'
' "saturation_level": string,'
' "brightness_level": string,'
' "contrast_level": string,'
' "sharpness_level": string,'
' "noise_level": string,'
' "compression_artifacts": string,'
' "color_banding": string,'
' "overall_quality": integer,'
' "aesthetic_quality": integer,'
' "scene_complexity": string,'
' "camera_motion": string,'
' "spatial_scale": string,'
' "content_difficulty": string,'
' "environment": string,'
' "location_type": string,'
' "video_theme": string,'
' "visual_style": string,'
' "camera_viewpoint": string,'
' "scene_change": boolean,'
' "main_objects": array of strings,'
' "main_objects_count": string,'
' "contains_people": boolean,'
' "people_count": string,'
' "contains_text_overlay": boolean'
    "\n}\n"

"Field requirements:\n"
"- summary: one concise sentence, maximum 30 words; include the main action, scene, key objects, and camera viewpoint only if clearly visible.\n"
"- dense_caption: 1 to 3 short sentences describing the visible scene and main event; do not repeat unnecessary details.\n"

"- motion_level: one of [low, medium, high].\n"
"- motion_variability: one of [consistent, varying, chaotic].\n"

"- texture_complexity: one of [low, medium, high].\n"
"- edge_density: one of [low, medium, high].\n"
"- scene_complexity: one of [simple, moderate, complex].\n"

"- color_richness: one of [low, medium, high].\n"
"- saturation_level: one of [low, medium, high].\n"
"- brightness_level: one of [dark, normal, bright].\n"
"- contrast_level: one of [low, medium, high].\n"

"- sharpness_level: one of [blurry, moderate, sharp].\n"
"- noise_level: one of [low, medium, high].\n"
"- compression_artifacts: one of [none, mild, noticeable, severe].\n"
"- color_banding: one of [none, mild, noticeable, severe].\n"

"- overall_quality: integer from 1 (very poor) to 5 (excellent).\n"
"- aesthetic_quality: integer from 1 (very low) to 5 (very high).\n"

"- camera_motion: one of [static, low, moderate, high, unstable].\n"
"- spatial_scale: one of [close, medium, wide].\n"

"- content_difficulty: one of [low, medium, high].\n"

"- environment: one of [indoor, outdoor, mixed, \"\"].\n"
"- location_type: short noun phrase (e.g., kitchen, street, beach, office); \"\" if unclear.\n"
"- video_theme: short label (e.g., sports, travel, pets, urban, nature); \"\" if unclear.\n"
"- visual_style: short phrase (e.g., natural color, low-light, cinematic, high saturation); \"\" if unclear.\n"

"- camera_viewpoint: one of [eye-level, overhead, close, wide, \"\"].\n"
"- scene_change: true if a scene cut occurs, else false.\n"

"- main_objects: array of visible objects; [] if unclear.\n"
"- main_objects_count: string integer matching length of main_objects.\n"

"- contains_people: true or false.\n"
"- people_count: one of [0, 1, 2, few, many, \"\"].\n"

"- contains_text_overlay: true if visible text (subtitles, watermark, UI), else false.\n"

    "Important rules:\n"
    "- Use only the provided categories.\n"
    "- Do NOT use the string 'unknown', 'unclear', or null.\n"
    "- Do NOT add explanations.\n"
    "- Do NOT output extra text.\n"
    "- Use empty string \"\" only where explicitly allowed.\n"
    "- If a string field is unclear, return an empty string \"\".\n"
    "- If main_objects is unclear, return [].\n"
    "- If a boolean field is unclear, choose false.\n"
    "- Keep labels consistent and simple.\n"
    "- Output must be strict valid JSON with exactly the listed keys and no additional keys.""
)