ProcessOutput.write_frame() takes ndarray, not bytes

ovgenpy/outputs.py

@@ -93,7 +93,9 @@ class ProcessOutput(Output):
         # Python documentation discourages accessing popen.stdin. It's wrong.
         # https://stackoverflow.com/a/9886747
 
-    def write_frame(self, frame: bytes) -> None:
+    def write_frame(self, frame: 'np.ndarray') -> None:
+        # frame.tobytes() avoids PyCharm complaining about type mismatch,
+        # but results in slightly higher CPU consumption.
         self._stream.write(frame)
 
     def close(self):