Update app.py

app.py

@@ -297,23 +297,27 @@ def video_webm():
 
 @app.route('/video/mp4')
 def video_mp4():
-    """MP4 streaming endpoint"""
+    """GPU-accelerated MP4 streaming using NVENC"""
     cmd = [
         'ffmpeg',
+        '-hwaccel', 'cuda',                    # Use GPU for decoding
+        '-hwaccel_output_format', 'cuda',       # Keep data on GPU
         '-f', 'rawvideo',
         '-pix_fmt', 'rgb24',
         '-s', f'{VIDEO_WIDTH}x{VIDEO_HEIGHT}',
-        '-r', str(VIDEO_FPS),
+        '-r', '30',
         '-i', '-',
-        '-c:v', 'libx264',
-        '-preset', 'ultrafast',
-        '-tune', 'zerolatency',
+        '-c:v', 'h264_nvenc',                    # NVIDIA's GPU encoder
+        '-preset', 'p4',                          # p1-p7, p4 is good balance
+        '-tune', 'll',                            # Low latency tuning
         '-b:v', '2M',
+        '-bufsize', '4M',
         '-f', 'mp4',
         '-movflags', 'frag_keyframe+empty_moov',
         '-'
     ]
     
+    
     process = subprocess.Popen(
         cmd,
         stdin=subprocess.PIPE,