Watchdog enhancements (#20237)

* refactor get_video_properties and use json output from ffprobe

* add zmq topic

* publish valid segment data in recording maintainer

* check for valid video data

- restart separate record ffmpeg process if no video data has been received in 120s
- refactor datetime import

* listen to correct topic in embeddings maintainer

* refactor to move get_latest_segment_datetime logic to recordings maintainer

* debug logging

* cleanup

frigate/comms/recordings_updater.py

@@ -2,6 +2,7 @@
 
 import logging
 from enum import Enum
+from typing import Any
 
 from .zmq_proxy import Publisher, Subscriber
 
@@ -10,18 +11,21 @@ logger = logging.getLogger(__name__)
 
 class RecordingsDataTypeEnum(str, Enum):
     all = ""
-    recordings_available_through = "recordings_available_through"
+    saved = "saved"  # segment has been saved to db
+    latest = "latest"  # segment is in cache
+    valid = "valid"  # segment is valid
+    invalid = "invalid"  # segment is invalid
 
 
-class RecordingsDataPublisher(Publisher[tuple[str, float]]):
+class RecordingsDataPublisher(Publisher[Any]):
     """Publishes latest recording data."""
 
     topic_base = "recordings/"
 
-    def __init__(self, topic: RecordingsDataTypeEnum) -> None:
-        super().__init__(topic.value)
+    def __init__(self) -> None:
+        super().__init__()
 
-    def publish(self, payload: tuple[str, float], sub_topic: str = "") -> None:
+    def publish(self, payload: Any, sub_topic: str = "") -> None:
         super().publish(payload, sub_topic)
 
 
@@ -32,3 +36,11 @@ class RecordingsDataSubscriber(Subscriber):
 
     def __init__(self, topic: RecordingsDataTypeEnum) -> None:
         super().__init__(topic.value)
+
+    def _return_object(
+        self, topic: str, payload: tuple | None
+    ) -> tuple[str, Any] | tuple[None, None]:
+        if payload is None:
+            return (None, None)
+
+        return (topic, payload)