update descriptions & comments to frame metadta

Author: chenosaurus

examples/local_video/publisher.py

@@ -21,7 +21,7 @@
 
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
-        description="Publish a local camera track with optional packet-trailer metadata.",
+        description="Publish a local camera track with optional frame metadata.",
         formatter_class=argparse.ArgumentDefaultsHelpFormatter,
     )
     parser.add_argument("--camera-index", type=int, default=0, help="OpenCV camera index to use")

examples/local_video/subscriber.py

@@ -33,7 +33,7 @@ class SubscribedVideoTrack:
 
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
-        description="Subscribe to a LiveKit video track and optionally display packet metadata.",
+        description="Subscribe to a LiveKit video track and optionally display frame metadata.",
         formatter_class=argparse.ArgumentDefaultsHelpFormatter,
     )
     parser.add_argument("--room-name", default="video-room", help="LiveKit room name")

livekit-rtc/livekit/rtc/video_source.py

@@ -60,7 +60,7 @@ def capture_frame(
         rotation: proto_video.VideoRotation.ValueType = proto_video.VideoRotation.VIDEO_ROTATION_0,
         metadata: proto_video.FrameMetadata | None = None,
     ) -> None:
-        """Capture a frame, optionally attaching packet trailer metadata."""
+        """Capture a frame, optionally attaching frame metadata."""
         req = proto_ffi.FfiRequest()
         req.capture_video_frame.source_handle = self._ffi_handle.handle
         req.capture_video_frame.buffer.CopyFrom(frame._proto_info())