Stream fixes (#22238)

* fix issues with out of order packets, and empty first packet on some IP camera models

* do not skip the first packet

homeassistant/components/stream/worker.py

@@ -63,21 +63,29 @@ def stream_worker(hass, stream, quit_event):
     first_packet = True
     sequence = 1
     audio_packets = {}
+    last_dts = None
 
     while not quit_event.is_set():
         try:
             packet = next(container.demux(video_stream))
             if packet.dts is None:
+                if first_packet:
+                    continue
                 # If we get a "flushing" packet, the stream is done
-                raise StopIteration
+                raise StopIteration("No dts in packet")
         except (av.AVError, StopIteration) as ex:
             # End of stream, clear listeners and stop thread
             for fmt, _ in outputs.items():
                 hass.loop.call_soon_threadsafe(
                     stream.outputs[fmt].put, None)
-            _LOGGER.error("Error demuxing stream: %s", ex)
+            _LOGGER.error("Error demuxing stream: %s", str(ex))
             break
 
+        # Skip non monotonically increasing dts in feed
+        if not first_packet and last_dts >= packet.dts:
+            continue
+        last_dts = packet.dts
+
         # Reset segment on every keyframe
         if packet.is_keyframe:
             # Save segment to outputs