human
Solve the following python programming problem given the following code:
def demux(self) : 
    if set_ffmpeg_timecodes._write_chapters : 
        with open (self._chapters_output_path, 'w') as output_file : 
            output_file.write (chapters.format_ogm_chapters (self.chapters)) 
if self._make_keyframes : 
        SCXviD.make_keyframes (self._path, self._keyframes_output_path) 
ffargs = { 
        
} 
    if self._demux_audio : 
        ffargs ['audio_stream'] = self._audio_stream.id 
        ffargs ['audio_path'] = self._audio_output_path 
        ffargs ['audio_rate'] = self._audio_sample_rate 
if self._demux_subs : 
        ffargs ['script_stream'] = self._script_stream.id 
        ffargs ['script_path'] = self._script_output_path 
if self._make_timecodes : 
        def set_ffmpeg_timecodes() : 
            ffargs ['video_stream'] = self._mi.video [0].id 
            ffargs ['timecodes_path'] = self._timecodes_output_path 
if (get_extension (self._path).lower () == '.mkv') : 
            try : 
                MkvToolnix.extract_timecodes (self._path, stream_idx = self._mi.video [0].id, output_path = self._timecodes_output_path) 
except OSError as e : 
                if (e.errno == 2) : 
                    set_ffmpeg_timecodes () 
else : 
                    raise 
else : 
            set_ffmpeg_timecodes () 
if ffargs : 
        FFmpeg.demux_file (self._path, ** ffargs) 

    
    

    Fix the buggy line: if set_ffmpeg_timecodes._write_chapters :
assistant
#Here is Python code to fix the buggy line: if set_ffmpeg_timecodes.

if self._write_chapters :