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CLI tools, scheduled jobs, filesystem tasks, and glue scripts that save time.

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Automation & scripting easy

How to Mock FFmpeg subprocess Calls in Python

Compress a video with ffmpeg while mocking subprocess.run to test the command construction without executing the actual encoder.

subprocess mocking ffmpeg
Python 
import subprocess
from unittest.mock import Mock, patch


def compress_video(input_path: str, output_path: str, crf: int = 23) -> None:
    """Compress a video using ffmpeg with a given CRF (quality) value."""
    command = [
        "ffmpeg",
        "-i", input_path,
        "-c:v", "libx264",
        "-crf", str(cr…
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