Avoid infinite loop on corrupt stream recording (#96881)

* Avoid infinite loop on corrupt stream recording

* Update tests

homeassistant/components/stream/fmp4utils.py

@@ -151,7 +151,7 @@ def find_moov(mp4_io: BufferedIOBase) -> int:
     while 1:
         mp4_io.seek(index)
         box_header = mp4_io.read(8)
-        if len(box_header) != 8:
+        if len(box_header) != 8 or box_header[0:4] == b"\x00\x00\x00\x00":
             raise HomeAssistantError("moov atom not found")
         if box_header[4:8] == b"moov":
             return index

tests/components/stream/test_worker.py

@@ -245,7 +245,7 @@ class FakePyAvBuffer:
         # Forward to appropriate FakeStream
         packet.stream.mux(packet)
         # Make new init/part data available to the worker
-        self.memory_file.write(b"\x00\x00\x00\x00moov")
+        self.memory_file.write(b"\x00\x00\x00\x08moov")
 
     def close(self):
         """Close the buffer."""