Update app.py

app.py

@@ -308,15 +308,41 @@ def generate_keyframe_image(
 # MoviePy lazy install/import
 # =========================
 def _ensure_moviepy():
+    """
+    Import MoviePy lazily. If unavailable, try a best-effort pip install.
+    If that still fails, raise a clear Gradio error telling the user to rebuild.
+    Also wires up the bundled ffmpeg from imageio-ffmpeg.
+    """
     try:
         from moviepy.editor import ImageClip, CompositeVideoClip, concatenate_videoclips
         from moviepy.video.io.VideoFileClip import VideoFileClip
         return ImageClip, CompositeVideoClip, concatenate_videoclips, VideoFileClip
     except Exception:
-        subprocess.check_call([sys.executable, "-m", "pip", "install", "moviepy", "imageio", "imageio-ffmpeg"])
+        pass  # will try to install below
+
+    # Try to install at runtime (some Spaces block this)
+    try:
+        import sys, subprocess
+        subprocess.check_call([sys.executable, "-m", "pip", "install", "-q",
+                               "moviepy==1.0.3", "imageio>=2.34.0", "imageio-ffmpeg>=0.4.9"])
+        # Point MoviePy to a known-good ffmpeg
+        try:
+            import imageio_ffmpeg, os as _os
+            _os.environ["IMAGEIO_FFMPEG_EXE"] = imageio_ffmpeg.get_ffmpeg_exe()
+        except Exception:
+            pass
+        # Try importing again
         from moviepy.editor import ImageClip, CompositeVideoClip, concatenate_videoclips
         from moviepy.video.io.VideoFileClip import VideoFileClip
         return ImageClip, CompositeVideoClip, concatenate_videoclips, VideoFileClip
+    except Exception as e:
+        # Final, friendly failure with next steps
+        import gradio as gr
+        raise gr.Error(
+            "MoviePy is not available. Add `moviepy==1.0.3`, `imageio>=2.34.0`, "
+            "`imageio-ffmpeg>=0.4.9` to requirements.txt and restart/rebuild the Space. "
+            f"(Runtime install failed with: {type(e).__name__}: {e})"
+        )
 
 # =========================
 # Video stitching (pairwise dissolve + final concat)