youtube-dl/youtube_dl/PostProcessor.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
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from __future__ import absolute_import
import os
import subprocess
import sys
import time
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from .utils import *
class PostProcessor(object):
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"""Post Processor class.
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PostProcessor objects can be added to downloaders with their
add_post_processor() method. When the downloader has finished a
successful download, it will take its internal chain of PostProcessors
and start calling the run() method on each one of them, first with
an initial argument and then with the returned value of the previous
PostProcessor.
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The chain will be stopped if one of them ever returns None or the end
of the chain is reached.
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PostProcessor objects follow a "mutual registration" process similar
to InfoExtractor objects.
"""
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_downloader = None
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def __init__(self, downloader=None):
self._downloader = downloader
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def set_downloader(self, downloader):
"""Sets the downloader for this PP."""
self._downloader = downloader
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def run(self, information):
"""Run the PostProcessor.
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The "information" argument is a dictionary like the ones
composed by InfoExtractors. The only difference is that this
one has an extra field called "filepath" that points to the
downloaded file.
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This method returns a tuple, the first element of which describes
whether the original file should be kept (i.e. not deleted - None for
no preference), and the second of which is the updated information.
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In addition, this method may raise a PostProcessingError
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exception if post processing fails.
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"""
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return None, information # by default, keep file and do nothing
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class FFmpegPostProcessorError(PostProcessingError):
pass
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class AudioConversionError(PostProcessingError):
pass
class FFmpegPostProcessor(PostProcessor):
def __init__(self,downloader=None):
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PostProcessor.__init__(self, downloader)
self._exes = self.detect_executables()
@staticmethod
def detect_executables():
def executable(exe):
try:
subprocess.Popen([exe, '-version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
except OSError:
return False
return exe
programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
return dict((program, executable(program)) for program in programs)
def run_ffmpeg(self, path, out_path, opts):
if not self._exes['ffmpeg'] and not self._exes['avconv']:
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raise FFmpegPostProcessorError(u'ffmpeg or avconv not found. Please install one.')
cmd = ([self._exes['avconv'] or self._exes['ffmpeg'], '-y', '-i', encodeFilename(path)]
+ opts +
[encodeFilename(self._ffmpeg_filename_argument(out_path))])
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout,stderr = p.communicate()
if p.returncode != 0:
msg = stderr.strip().split('\n')[-1]
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raise FFmpegPostProcessorError(msg.decode('utf-8', 'replace'))
def _ffmpeg_filename_argument(self, fn):
# ffmpeg broke --, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details
if fn.startswith(u'-'):
return u'./' + fn
return fn
class FFmpegExtractAudioPP(FFmpegPostProcessor):
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def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
FFmpegPostProcessor.__init__(self, downloader)
if preferredcodec is None:
preferredcodec = 'best'
self._preferredcodec = preferredcodec
self._preferredquality = preferredquality
self._nopostoverwrites = nopostoverwrites
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def get_audio_codec(self, path):
if not self._exes['ffprobe'] and not self._exes['avprobe']: return None
try:
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cmd = [self._exes['avprobe'] or self._exes['ffprobe'], '-show_streams', encodeFilename(self._ffmpeg_filename_argument(path))]
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handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE)
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output = handle.communicate()[0]
if handle.wait() != 0:
return None
except (IOError, OSError):
return None
audio_codec = None
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for line in output.decode('ascii', 'ignore').split('\n'):
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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
def run_ffmpeg(self, path, out_path, codec, more_opts):
if not self._exes['ffmpeg'] and not self._exes['avconv']:
raise AudioConversionError('ffmpeg or avconv not found. Please install one.')
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if codec is None:
acodec_opts = []
else:
acodec_opts = ['-acodec', codec]
opts = ['-vn'] + acodec_opts + more_opts
try:
FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
except FFmpegPostProcessorError as err:
raise AudioConversionError(err.message)
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def run(self, information):
path = information['filepath']
filecodec = self.get_audio_codec(path)
if filecodec is None:
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raise PostProcessingError(u'WARNING: unable to obtain file audio codec with ffprobe')
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more_opts = []
if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
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if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
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# Lossless, but in another container
acodec = 'copy'
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extension = 'm4a'
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more_opts = [self._exes['avconv'] and '-bsf:a' or '-absf', 'aac_adtstoasc']
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elif filecodec in ['aac', 'mp3', 'vorbis', 'opus']:
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# Lossless if possible
acodec = 'copy'
extension = filecodec
if filecodec == 'aac':
more_opts = ['-f', 'adts']
if filecodec == 'vorbis':
extension = 'ogg'
else:
# MP3 otherwise.
acodec = 'libmp3lame'
extension = 'mp3'
more_opts = []
if self._preferredquality is not None:
if int(self._preferredquality) < 10:
more_opts += [self._exes['avconv'] and '-q:a' or '-aq', self._preferredquality]
else:
more_opts += [self._exes['avconv'] and '-b:a' or '-ab', self._preferredquality + 'k']
else:
# We convert the audio (lossy)
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acodec = {'mp3': 'libmp3lame', 'aac': 'aac', 'm4a': 'aac', 'opus': 'opus', 'vorbis': 'libvorbis', 'wav': None}[self._preferredcodec]
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extension = self._preferredcodec
more_opts = []
if self._preferredquality is not None:
if int(self._preferredquality) < 10:
more_opts += [self._exes['avconv'] and '-q:a' or '-aq', self._preferredquality]
else:
more_opts += [self._exes['avconv'] and '-b:a' or '-ab', self._preferredquality + 'k']
if self._preferredcodec == 'aac':
more_opts += ['-f', 'adts']
if self._preferredcodec == 'm4a':
more_opts += [self._exes['avconv'] and '-bsf:a' or '-absf', 'aac_adtstoasc']
if self._preferredcodec == 'vorbis':
extension = 'ogg'
if self._preferredcodec == 'wav':
extension = 'wav'
more_opts += ['-f', 'wav']
prefix, sep, ext = path.rpartition(u'.') # not os.path.splitext, since the latter does not work on unicode in all setups
new_path = prefix + sep + extension
# If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
if new_path == path:
self._nopostoverwrites = True
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try:
if self._nopostoverwrites and os.path.exists(encodeFilename(new_path)):
self._downloader.to_screen(u'[youtube] Post-process file %s exists, skipping' % new_path)
else:
self._downloader.to_screen(u'[' + (self._exes['avconv'] and 'avconv' or 'ffmpeg') + '] Destination: ' + new_path)
self.run_ffmpeg(path, new_path, acodec, more_opts)
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except:
etype,e,tb = sys.exc_info()
if isinstance(e, AudioConversionError):
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msg = u'audio conversion failed: ' + e.message
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else:
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msg = u'error running ' + (self._exes['avconv'] and 'avconv' or 'ffmpeg')
raise PostProcessingError(msg)
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# Try to update the date time for extracted audio file.
if information.get('filetime') is not None:
try:
os.utime(encodeFilename(new_path), (time.time(), information['filetime']))
except:
self._downloader.to_stderr(u'WARNING: Cannot update utime of audio file')
information['filepath'] = new_path
return self._nopostoverwrites,information
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class FFmpegVideoConvertor(FFmpegPostProcessor):
def __init__(self, downloader=None,preferedformat=None):
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super(FFmpegVideoConvertor, self).__init__(downloader)
self._preferedformat=preferedformat
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def run(self, information):
path = information['filepath']
prefix, sep, ext = path.rpartition(u'.')
outpath = prefix + sep + self._preferedformat
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if information['ext'] == self._preferedformat:
self._downloader.to_screen(u'[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
return True,information
self._downloader.to_screen(u'['+'ffmpeg'+'] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) +outpath)
self.run_ffmpeg(path, outpath, [])
information['filepath'] = outpath
information['format'] = self._preferedformat
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information['ext'] = self._preferedformat
return False,information