inference_example.py

import os

from inference.models.utils import get_roboflow_model
from tqdm import tqdm

import supervision as sv


def main(
    source_video_path: str,
    target_video_path: str,
    roboflow_api_key: str,
    model_id: str = "yolov8x-1280",
    confidence_threshold: float = 0.3,
    iou_threshold: float = 0.7,
) -> None:
    """
    Video Processing with Inference and ByteTrack.

    Args:
        source_video_path: Path to the source video file
        target_video_path: Path to the target video file (output)
        roboflow_api_key: Roboflow API key
        model_id: Roboflow model ID
        confidence_threshold: Confidence threshold for the model
        iou_threshold: IOU threshold for the model
    """
    api_key = os.environ.get("ROBOFLOW_API_KEY", roboflow_api_key)
    if api_key is None:
        raise ValueError(
            "Roboflow API key is missing. Please provide it as an argument or set the "
            "ROBOFLOW_API_KEY environment variable."
        )

    model = get_roboflow_model(model_id=model_id, api_key=api_key)

    tracker = sv.ByteTrack()
    box_annotator = sv.BoxAnnotator()
    label_annotator = sv.LabelAnnotator()
    frame_generator = sv.get_video_frames_generator(source_path=source_video_path)
    video_info = sv.VideoInfo.from_video_path(video_path=source_video_path)

    with sv.VideoSink(target_path=target_video_path, video_info=video_info) as sink:
        for frame in tqdm(frame_generator, total=video_info.total_frames):
            results = model.infer(
                frame, confidence=confidence_threshold, iou_threshold=iou_threshold
            )[0]
            detections = sv.Detections.from_inference(results)
            detections = tracker.update_with_detections(detections)

            annotated_frame = box_annotator.annotate(
                scene=frame.copy(), detections=detections
            )

            annotated_labeled_frame = label_annotator.annotate(
                scene=annotated_frame, detections=detections
            )

            sink.write_frame(frame=annotated_labeled_frame)


if __name__ == "__main__":
    from jsonargparse import auto_cli, set_parsing_settings

    set_parsing_settings(parse_optionals_as_positionals=True)
    auto_cli(main, as_positional=False)