Ya hice eso, sin embargo el ffmpeg no se donde pegarlo, no viene como tal como un instalador y me genera error

ffmpeg: Executable not found on machine.
Traceback (most recent call last):
File "c:\Python27\scripts\autosub_app.py", line 304, in <module>
sys.exit(main())
File "c:\Python27\scripts\autosub_app.py", line 230, in main
audio_filename, audio_rate = extract_audio(args.source_path)
File "c:\Python27\scripts\autosub_app.py", line 140, in extract_audio
raise Exception("Dependency not found: ffmpeg")
Exception: Dependency not found: ffmpeg