+class FFmpegExtractAudioPP(PostProcessor):
+
+ def __init__(self, downloader=None, preferredcodec=None):
+ PostProcessor.__init__(self, downloader)
+ if preferredcodec is None:
+ preferredcodec = 'best'
+ self._preferredcodec = preferredcodec
+
+ @staticmethod
+ def get_audio_codec(path):
+ handle = subprocess.Popen(['ffprobe', '-show_streams', path],
+ stderr=file(os.path.devnull, 'w'), stdout=subprocess.PIPE)
+ output = handle.communicate()[0]
+ if handle.wait() != 0:
+ return None
+ audio_codec = None
+ for line in output.split('\n'):
+ if line.startswith('codec_name='):
+ audio_codec = line.split('=')[1].strip()
+ elif line.strip() == 'codec_type=audio' and audio_codec is not None:
+ return audio_codec
+ return None
+
+ @staticmethod
+ def run_ffmpeg(path, out_path, codec, more_opts):
+ try:
+ ret = subprocess.call(['ffmpeg', '-y', '-i', path, '-vn', '-acodec', codec] + more_opts + [out_path],
+ stdout=file(os.path.devnull, 'w'), stderr=subprocess.STDOUT)
+ return (ret == 0)
+ except (IOError, OSError):
+ return False
+
+ def run(self, information):
+ path = information['filepath']
+
+ filecodec = self.get_audio_codec(path)
+ if filecodec is None:
+ self._downloader.to_stderr(u'WARNING: no audio codec found in file')
+ return None
+
+ more_opts = []
+ if self._preferredcodec == 'best' or self._preferredcodec == filecodec:
+ if filecodec == 'aac' or filecodec == 'mp3':
+ # Lossless if possible
+ acodec = 'copy'
+ extension = filecodec
+ if filecodec == 'aac':
+ more_opts = ['-f', 'adts']
+ else:
+ # MP3 otherwise.
+ acodec = 'libmp3lame'
+ extension = 'mp3'
+ more_opts = ['-ab', '128k']
+ else:
+ # We convert the audio (lossy)
+ acodec = {'mp3': 'libmp3lame', 'aac': 'aac'}[self._preferredcodec]
+ extension = self._preferredcodec
+ more_opts = ['-ab', '128k']
+ if self._preferredcodec == 'aac':
+ more_opts += ['-f', 'adts']
+
+ (prefix, ext) = os.path.splitext(path)
+ new_path = prefix + '.' + extension
+ self._downloader.to_screen(u'[ffmpeg] Destination: %s' % new_path)
+ status = self.run_ffmpeg(path, new_path, acodec, more_opts)
+
+ if not status:
+ self._downloader.to_stderr(u'WARNING: error running ffmpeg' % ret)
+ return None
+
+ try:
+ os.remove(path)
+ except (IOError, OSError):
+ self._downloader.to_stderr(u'WARNING: Unable to remove downloaded video file')
+ return None
+
+ information['filepath'] = new_path
+ return information
+