diff options
| -rwxr-xr-x | youtube-dl | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/youtube-dl b/youtube-dl index 2e04c05b0..b0981da0d 100755 --- a/youtube-dl +++ b/youtube-dl @@ -2609,6 +2609,85 @@ class PostProcessor(object): """ return information # by default, do nothing +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 + ### MAIN PROGRAM ### if __name__ == '__main__': try: @@ -2733,6 +2812,13 @@ if __name__ == '__main__': help='do not use the Last-modified header to set the file modification time', default=True) parser.add_option_group(filesystem) + postproc = optparse.OptionGroup(parser, 'Post-processing Options') + postproc.add_option('--extract-audio', action='store_true', dest='extractaudio', default=False, + help='convert video files to audio-only files (requires ffmpeg and ffprobe)') + postproc.add_option('--audio-format', metavar='FORMAT', dest='audioformat', default='best', + help='"best", "aac" or "mp3"; best by default') + parser.add_option_group(postproc) + (opts, args) = parser.parse_args() # Open appropriate CookieJar @@ -2804,6 +2890,9 @@ if __name__ == '__main__': raise ValueError except (TypeError, ValueError), err: parser.error(u'invalid playlist end number specified') + if opts.extractaudio: + if opts.audioformat not in ['best', 'aac', 'mp3']: + parser.error(u'invalid audio format specified') # Information extractors youtube_ie = YoutubeIE() @@ -2876,6 +2965,10 @@ if __name__ == '__main__': # fallback if none of the others work fd.add_info_extractor(generic_ie) + # PostProcessors + if opts.extractaudio: + fd.add_post_processor(FFmpegExtractAudioPP(preferredcodec=opts.audioformat)) + # Update version if opts.update_self: update_self(fd, sys.argv[0]) |