videoanalysis: prevent snapshot throttling when its only a single camera

plugins/objectdetector/package-lock.json

@@ -1,12 +1,12 @@
 {
    "name": "@scrypted/objectdetector",
-   "version": "0.0.141",
+   "version": "0.0.142",
    "lockfileVersion": 2,
    "requires": true,
    "packages": {
       "": {
          "name": "@scrypted/objectdetector",
-         "version": "0.0.141",
+         "version": "0.0.142",
          "license": "Apache-2.0",
          "dependencies": {
             "@scrypted/common": "file:../../common",

plugins/objectdetector/package.json

@@ -1,6 +1,6 @@
 {
    "name": "@scrypted/objectdetector",
-   "version": "0.0.141",
+   "version": "0.0.142",
    "description": "Scrypted Video Analysis Plugin. Installed alongside a detection service like OpenCV or TensorFlow.",
    "author": "Scrypted",
    "license": "Apache-2.0",

plugins/objectdetector/src/main.ts

@@ -991,6 +991,10 @@ class ObjectDetectionPlugin extends AutoenableMixinProvider implements Settings,
   shouldUseSnapshotPipeline() {
     this.pruneOldStatistics();
 
+    // never use snapshot mode if its a single camera.
+    if (this.statsSnapshotConcurrent < 2)
+      return false;
+
     // find any concurrent cameras with as many or more that had passable results
     for (const [k, v] of this.objectDetectionStatistics.entries()) {
       if (v.dps > 2 && k >= this.statsSnapshotConcurrent)