Technically, an M4S file contains a moof (Movie Fragment) box followed by an mdat (Media Data) box.
⚠️ Only download content you have permission to access (e.g., your own streams, DRM-free content, or publicly available DASH streams). Bypassing DRM or downloading copyrighted material without authorization may violate terms of service or laws. m4s downloader
print(f"Saved: output_file")