Move postprocessor into its own package

setup.py

@@ -71,7 +71,10 @@ setup(
     author_email='ytdl@yt-dl.org',
     maintainer='Philipp Hagemeister',
     maintainer_email='phihag@phihag.de',
-    packages=['youtube_dl', 'youtube_dl.extractor', 'youtube_dl.downloader'],
+    packages=[
+        'youtube_dl',
+        'youtube_dl.extractor', 'youtube_dl.downloader',
+        'youtube_dl.postprocessor'],
 
     # Provokes warning on most systems (why?!)
     # test_suite = 'nose.collector',

youtube_dl/YoutubeDL.py

@@ -55,7 +55,7 @@ from .utils import (
 )
 from .extractor import get_info_extractor, gen_extractors
 from .downloader import get_suitable_downloader
-from .PostProcessor import FFmpegMergerPP
+from .postprocessor import FFmpegMergerPP
 from .version import __version__
 
 

youtube_dl/__init__.py

@@ -75,7 +75,7 @@ from .FileDownloader import (
 from .extractor import gen_extractors
 from .version import __version__
 from .YoutubeDL import YoutubeDL
-from .PostProcessor import (
+from .postprocessor import (
     FFmpegMetadataPP,
     FFmpegVideoConvertor,
     FFmpegExtractAudioPP,