commit 3072fab115b3c89322edc906a8f88f997e46dedd
parent 87cbd21323195cacb0febc7898a7fdc74ed97f9b
Author: Ricardo Garcia <sarbalap+freshmeat@gmail.com>
Date: Fri, 25 Feb 2011 19:06:58 +0100
Add an audio extracting PostProcessor using ffmpeg (closes #2)
Diffstat:
| M | youtube-dl | | | 93 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 93 insertions(+), 0 deletions(-)
diff --git 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])
