fix: add explicit GPU memory cleanup between models to prevent OOM

app.py

@@ -196,6 +196,19 @@ def api_videos():
     return jsonify(videos)
 
 
+@app.route("/api/videos/<filename>", methods=["DELETE"])
+def api_delete_video(filename):
+    """Delete an uploaded video."""
+    safe = secure_filename(filename)
+    if not safe or not safe.lower().endswith(VIDEO_EXTENSIONS):
+        return jsonify({"error": "invalid filename"}), 400
+    file_path = os.path.join(UPLOAD_DIR, safe)
+    if not os.path.isfile(file_path):
+        return jsonify({"error": "not found"}), 404
+    os.remove(file_path)
+    return jsonify({"status": "deleted"})
+
+
 @app.route("/api/models")
 def api_models():
     groups = scan_model_groups(MODELS_DIR)

src/detection.py

@@ -28,6 +28,17 @@ class BaseDetector:
         self._conf = conf
         self._class_filter = set(class_filter) if class_filter else None
 
+    def cleanup(self) -> None:
+        """Release model resources and GPU memory."""
+        self._model = None
+        try:
+            import gc
+            gc.collect()
+            import torch
+            torch.cuda.empty_cache()
+        except Exception:
+            pass
+
     def detect(self, frame: np.ndarray) -> list[Detection]:
         results = self._model.predict(
             frame, conf=self._conf, verbose=False

src/job.py

@@ -181,6 +181,15 @@ class JobQueue:
                         )
                     )
 
+                # Force release GPU memory between models
+                import gc
+                gc.collect()
+                try:
+                    import torch
+                    torch.cuda.empty_cache()
+                except Exception:
+                    pass
+
             with self._lock:
                 if job.status != JobStatus.CANCELLED:
                     job.status = JobStatus.COMPLETED

src/pipeline.py

@@ -235,6 +235,14 @@ def run_pipeline(
         cap.release()
         if writer is not None:
             writer.finish()
+        # Force GPU memory release for TensorRT engines
+        import gc
+        gc.collect()
+        try:
+            import torch
+            torch.cuda.empty_cache()
+        except Exception:
+            pass
 
     duration = time.time() - start_time
     return PipelineResult(

static/app.js

@@ -132,6 +132,23 @@
     return m + ':' + (s < 10 ? '0' : '') + s;
   }
 
+  function formatRelativeTime(timestamp) {
+    var now = Math.floor(Date.now() / 1000);
+    var diff = now - timestamp;
+    if (diff < 0) diff = 0;
+    if (diff < 60) return 'just now';
+    if (diff < 3600) {
+      var mins = Math.floor(diff / 60);
+      return mins + (mins === 1 ? ' minute ago' : ' minutes ago');
+    }
+    if (diff < 86400) {
+      var hrs = Math.floor(diff / 3600);
+      return hrs + (hrs === 1 ? ' hour ago' : ' hours ago');
+    }
+    var days = Math.floor(diff / 86400);
+    return days + (days === 1 ? ' day ago' : ' days ago');
+  }
+
   /* ------------------------------------------------
      Model Cards — select/deselect, highlight
   ------------------------------------------------ */
@@ -205,11 +222,12 @@
           var item = document.createElement('label');
           item.className = 'video-item';
           item.innerHTML =
-            '<input type="radio" name="existing_video" class="video-item-radio" data-path="' + escapeHtml(v.path) + '" data-name="' + escapeHtml(v.name) + '" data-size="' + v.size + '">' +
+            '<input type="radio" name="existing_video" class="video-item-radio" data-path="' + escapeHtml(v.path) + '" data-name="' + escapeHtml(v.filename) + '" data-size="' + v.size + '">' +
             '<div class="video-item-info">' +
-            '<div class="video-item-name">' + escapeHtml(v.name) + '</div>' +
-            '<div class="video-item-meta">' + formatBytes(v.size) + '</div>' +
-            '</div>';
+            '<div class="video-item-name">' + escapeHtml(v.filename) + '</div>' +
+            '<div class="video-item-meta">' + formatBytes(v.size) + ' &middot; ' + formatRelativeTime(v.mtime) + '</div>' +
+            '</div>' +
+            '<button type="button" class="video-delete-btn" title="Delete video" data-filename="' + escapeHtml(v.filename) + '">&#128465;</button>';
           var radio = item.querySelector('input[type="radio"]');
           radio.addEventListener('change', function () {
             // Deselect all other items
@@ -221,7 +239,7 @@
               selectedExistingVideo = v.path;
               videoPathInput.value = v.path;
               // Show in file-info
-              fileName.textContent = v.name;
+              fileName.textContent = v.filename;
               fileSize.textContent = formatBytes(v.size);
               fileDuration.textContent = '—';
               fileInfo.classList.add('visible');
@@ -237,9 +255,28 @@
           });
           item.addEventListener('click', function (e) {
             if (e.target.tagName === 'INPUT') return;
+            if (e.target.classList.contains('video-delete-btn')) return;
             radio.checked = true;
             radio.dispatchEvent(new Event('change'));
           });
+          var deleteBtn = item.querySelector('.video-delete-btn');
+          if (deleteBtn) {
+            deleteBtn.addEventListener('click', function (e) {
+              e.preventDefault();
+              e.stopPropagation();
+              if (!confirm('Delete "' + v.filename + '"?')) return;
+              fetch('/api/videos/' + encodeURIComponent(v.filename), { method: 'DELETE' })
+                .then(function (res) { return res.json(); })
+                .then(function (data) {
+                  if (data.status === 'deleted') {
+                    item.remove();
+                    if (!videoList.querySelector('.video-item')) {
+                      existingSection.style.display = 'none';
+                    }
+                  }
+                });
+            });
+          }
           videoList.appendChild(item);
         });
       })

templates/index.html

@@ -256,6 +256,32 @@
     color: var(--color-neutral-500);
   }
   .empty-state p { margin-bottom: var(--space-2); }
+
+  /* Video delete button */
+  .video-delete-btn {
+    flex-shrink: 0;
+    width: 32px;
+    height: 32px;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    border: 1px solid var(--color-neutral-200);
+    border-radius: var(--radius-sm);
+    background: var(--color-neutral-50);
+    color: var(--color-neutral-400);
+    cursor: pointer;
+    font-size: var(--text-sm);
+    transition: all var(--transition-fast);
+    opacity: 0;
+  }
+  .video-item:hover .video-delete-btn {
+    opacity: 1;
+  }
+  .video-delete-btn:hover {
+    background: #FEE2E2;
+    color: #DC2626;
+    border-color: #FECACA;
+  }
 </style>
 {% endblock %}