AI Video Generation Implementation

backend/services/story_writer/video_preflight.py

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+from __future__ import annotations
+
+from loguru import logger
+
+
+def log_video_stack_diagnostics() -> None:
+    try:
+        import sys
+        import platform
+        import importlib
+
+        mv = importlib.import_module("moviepy")
+        im = importlib.import_module("imageio")
+        try:
+            import imageio_ffmpeg as iff
+            ff = iff.get_ffmpeg_exe()
+        except Exception:
+            ff = "unresolved"
+        logger.info(
+            "[VideoStack] py={} plat={} moviepy={} imageio={} ffmpeg={}",
+            sys.executable,
+            platform.platform(),
+            getattr(mv, "__version__", "NA"),
+            getattr(im, "__version__", "NA"),
+            ff,
+        )
+    except Exception as e:
+        logger.error("[VideoStack] diagnostics failed: {}", e)
+
+
+def assert_supported_moviepy() -> None:
+    """Fail fast if MoviePy isn't version 2.x."""
+    try:
+        import pkg_resources as pr
+        mv = pr.get_distribution("moviepy").version
+        if not mv.startswith("2."):
+            raise RuntimeError(
+                f"Unsupported MoviePy version {mv}. Expected 2.x. "
+                "Please install with: pip install moviepy==2.1.2"
+            )
+    except Exception as e:
+        # Log and re-raise so startup fails clearly
+        logger.error("[VideoStack] version check failed: {}", e)
+        raise
+
+