#31 Features from animelover1984/youtube-dl

* Add `--get-comments`
* [youtube] Extract comments
* [billibilli] Added BiliBiliSearchIE, BilibiliChannelIE
* [billibilli] Extract comments
* [billibilli] Better video extraction
* Write playlist data to infojson
* [FFmpegMetadata] Embed infojson inside the video
* [EmbedThumbnail] Try embedding in mp4 using ffprobe and `-disposition`
* [EmbedThumbnail] Treat mka like mkv and mov like mp4
* [EmbedThumbnail] Embed in ogg/opus
* [VideoRemuxer] Conditionally remux video
* [VideoRemuxer] Add `-movflags +faststart` when remuxing from mp4
* [ffmpeg] Print entire stderr in verbose when there is error
* [EmbedSubtitle] Warn when embedding ass in mp4
* [avanto] Use NFLTokenGenerator if possible

youtube_dlc/YoutubeDL.py

@@ -202,6 +202,8 @@ class YoutubeDL(object):
     logtostderr:       Log messages to stderr instead of stdout.
     writedescription:  Write the video description to a .description file
     writeinfojson:     Write the video description to a .info.json file
+    writecomments:     Extract video comments. This will not be written to disk
+                       unless writeinfojson is also given
     writeannotations:  Write the video annotations to a .annotations.xml file
     writethumbnail:    Write the thumbnail image to a file
     write_all_thumbnails:  Write all thumbnail formats to files
@@ -930,9 +932,7 @@ class YoutubeDL(object):
                 self.to_screen("[%s] %s: has already been recorded in archive" % (
                                ie_key, temp_id))
                 break
-
             return self.__extract_info(url, ie, download, extra_info, process, info_dict)
-
         else:
             self.report_error('no suitable InfoExtractor for URL %s' % url)
 
@@ -1101,6 +1101,21 @@ class YoutubeDL(object):
         playlist = ie_result.get('title') or ie_result.get('id')
         self.to_screen('[download] Downloading playlist: %s' % playlist)
 
+        if self.params.get('writeinfojson', False):
+            infofn = replace_extension(
+                self.prepare_filepath(self.prepare_filename(ie_result), 'infojson'),
+                'info.json', ie_result.get('ext'))
+            if self.params.get('overwrites', True) and os.path.exists(encodeFilename(infofn)):
+                self.to_screen('[info] Playlist description metadata is already present')
+            else:
+                self.to_screen('[info] Writing description playlist metadata as JSON to: ' + infofn)
+                playlist_info = dict(ie_result)
+                playlist_info.pop('entries')
+                try:
+                    write_json_file(self.filter_requested_info(playlist_info), infofn)
+                except (OSError, IOError):
+                    self.report_error('Cannot write playlist description metadata to JSON file ' + infofn)
+
         playlist_results = []
 
         playliststart = self.params.get('playliststart', 1) - 1
@@ -2105,6 +2120,7 @@ class YoutubeDL(object):
                 except (OSError, IOError):
                     self.report_error('Cannot write metadata to JSON file ' + infofn)
                     return
+            info_dict['__infojson_filepath'] = infofn
 
         thumbdir = os.path.dirname(self.prepare_filepath(filename, 'thumbnail'))
         for thumbfn in self._write_thumbnails(info_dict, temp_filename):