Enhance media API with video file validation and Docker configuration update

- Added a function to check if video files are complete and valid using ffprobe, preventing errors during thumbnail generation.
- Updated thumbnail generation logic to skip incomplete or corrupted files, improving robustness.
- Modified docker-compose.yml to include a restart policy for the camera management API service, ensuring better container reliability.

docker-compose.yml

@@ -5,6 +5,7 @@ services:
       context: ./camera-management-api
       dockerfile: Dockerfile
     working_dir: /app
+    restart: unless-stopped  # Automatically restart container if it fails or exits
     volumes:
       - ./camera-management-api:/app
       - /mnt/nfs_share:/mnt/nfs_share

media-api/main.py

@@ -138,13 +138,45 @@ def file_id_from_path(p: pathlib.Path) -> str:
 
 
 def path_from_file_id(fid: str) -> pathlib.Path:
-    rel = urllib.parse.unquote_plus(fid)
+    # Handle double-encoding: decode until no more changes
+    rel = fid
+    while True:
+        decoded = urllib.parse.unquote_plus(rel)
+        if decoded == rel:
+            break
+        rel = decoded
     p = (MEDIA_DIR / rel).resolve()
     if not p.is_file() or MEDIA_DIR not in p.parents:
         raise HTTPException(status_code=404, detail="Video not found")
     return p
 
 
+def is_video_file_complete(p: pathlib.Path) -> bool:
+    """
+    Check if video file is complete and valid using ffprobe.
+    Returns True if file is complete and can be processed, False otherwise.
+    """
+    try:
+        # Quick check: use ffprobe to verify file is valid
+        cmd = [
+            "ffprobe",
+            "-v", "error",
+            "-show_entries", "format=duration",
+            "-of", "default=noprint_wrappers=1:nokey=1",
+            str(p)
+        ]
+        result = subprocess.run(
+            cmd,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            timeout=5
+        )
+        # If ffprobe succeeds, file is valid
+        return result.returncode == 0
+    except (subprocess.TimeoutExpired, subprocess.CalledProcessError, Exception):
+        return False
+
+
 def generate_thumbnail_background(p: pathlib.Path, width: int = 320, height: int = 180) -> bool:
     """
     Generate thumbnail in background (non-blocking, doesn't raise exceptions).
@@ -188,13 +220,19 @@ def generate_thumbnail_background(p: pathlib.Path, width: int = 320, height: int
         except OSError:
             return False
     
+    # Check if video file is complete and valid before attempting thumbnail generation
+    # This prevents errors with incomplete/corrupted files
+    if not is_video_file_complete(p):
+        return False  # File is incomplete or corrupted, skip
+    
     # Try to generate thumbnail - try 1s first, then 0s if that fails
     for seek_time in [1.0, 0.0]:
         cmd = [
             "ffmpeg", "-y",
             "-ss", str(seek_time),
             "-i", str(p),
-            "-vframes", "1",
+            "-frames:v", "1",
+            "-update", "1",  # Required for single image output with image2 muxer
             "-vf", f"scale='min({width},iw)':-2,scale={width}:{height}:force_original_aspect_ratio=decrease,pad={width}:{height}:(ow-iw)/2:(oh-ih)/2",
             str(out)
         ]