ensure detection_start doesnt change values between conditions

Dockerfile

@@ -7,7 +7,7 @@ RUN apt -qq update && apt -qq install --no-install-recommends -y \
     software-properties-common \
     # apt-transport-https ca-certificates \
     build-essential \
-    gnupg wget unzip tzdata \
+    gnupg wget unzip \
     # libcap-dev \
     && add-apt-repository ppa:deadsnakes/ppa -y \
     && apt -qq install --no-install-recommends -y \

detect_objects.py

@@ -84,8 +84,6 @@ class CameraWatchdog(threading.Thread):
         while True:
             # wait a bit before checking
             time.sleep(10)
-
-            now = datetime.datetime.now().timestamp()
             
             # check the plasma process
             rc = self.plasma_process.poll()
@@ -96,7 +94,7 @@ class CameraWatchdog(threading.Thread):
             # check the detection process
             detection_start = self.tflite_process.detection_start.value
             if (detection_start > 0.0 and 
-                now - detection_start > 10):
+                datetime.datetime.now().timestamp() - detection_start > 10):
                 print("Detection appears to be stuck. Restarting detection process")
                 self.tflite_process.start_or_restart()
             elif not self.tflite_process.detect_process.is_alive():
@@ -129,17 +127,6 @@ class CameraWatchdog(threading.Thread):
                     camera_capture.start()
                     camera_process['ffmpeg_process'] = ffmpeg_process
                     camera_process['capture_thread'] = camera_capture
-                elif now - camera_process['capture_thread'].current_frame > 5:
-                    print(f"No frames received from {name} in 5 seconds. Exiting ffmpeg...")
-                    ffmpeg_process = camera_process['ffmpeg_process']
-                    ffmpeg_process.terminate()
-                    try:
-                        print("Waiting for ffmpeg to exit gracefully...")
-                        ffmpeg_process.communicate(timeout=30)
-                    except sp.TimeoutExpired:
-                        print("FFmpeg didnt exit. Force killing...")
-                        ffmpeg_process.kill()
-                        ffmpeg_process.communicate()
 
 def main():
     # connect to mqtt and setup last will