encode_intro_segment_core.py

def encode_intro_segment_core(
    video_file_path: str,
    duration: float = 300.0,  # 5 minutes
    video_height: int = 120,   # Low resolution
    video_crf: int = 28,       # Quality setting
    video_fps: int = 5,        # Reduced frame rate
) -> Optional[str]:
    """Extract and encode the first 5 minutes of the video."""
    
    # Build optimized ffmpeg command
    cmd = [
        "ffmpeg", "-y", "-i", str(input_path),
        "-t", str(duration),
        "-vf", f"scale=trunc(oh*a/2)*2:{video_height},format=gray",
        "-c:v", "libx264", "-crf", str(video_crf),
        "-preset", "fast", "-r", str(video_fps),
        "-an",  # Remove audio entirely