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"""
Extract a single frame from a video file
"""
import cv2
from pathlib import Path
from typing import Tuple, Optional
def extract_frame(
video_path: str,
frame_id: int,
output_path: Optional[str] = None
) -> Tuple[str, int, int]:
"""
Extract a single frame from video
Args:
video_path: Path to video file
frame_id: Frame number to extract (0-indexed)
output_path: Optional output path. If None, generates from video path
Returns:
Tuple of (output_image_path, width, height)
"""
# Open video
cap = cv2.VideoCapture(video_path)
if not cap.isOpened():
raise ValueError(f"Could not open video: {video_path}")
# Get video properties
total_frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
if frame_id >= total_frames:
cap.release()
raise ValueError(f"Frame {frame_id} out of range (total: {total_frames})")
# Seek to frame
cap.set(cv2.CAP_PROP_POS_FRAMES, frame_id)
# Read frame
ret, frame = cap.read()
cap.release()
if not ret:
raise ValueError(f"Could not read frame {frame_id} from video")
# Generate output path if not provided
if output_path is None:
video_stem = Path(video_path).stem
output_dir = Path(video_path).parent / "temp_frames"
output_dir.mkdir(exist_ok=True)
output_path = str(output_dir / f"{video_stem}_frame_{frame_id:06d}.jpg")
# Ensure output directory exists
output_path_obj = Path(output_path)
output_path_obj.parent.mkdir(parents=True, exist_ok=True)
# Save frame
cv2.imwrite(output_path, frame)
return (output_path, width, height)
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