Remove '-r' flag from ffmpeg args

Remove the explicit "-r" option when assembling the ffmpeg command in RTSPVideoStreamWriter. This prevents forcing an output frame rate and allows ffmpeg to rely on frame timestamps (use_wallclock_as_timestamps) or avoid conflicting rate settings.

Author: openminddev

src/om1_vlm/anonymizationSys/face_recog_stream/rtsp_video_writer.py

@@ -189,8 +189,6 @@ def _build_ffmpeg_command(self, is_raw: bool = False):
             "bgr24",
             "-s",
             f"{self.width}x{self.height}",
-            "-r",
-            f"{self.current_fps:.3f}",
             "-use_wallclock_as_timestamps",
             "1",
             "-thread_queue_size",