fix: handle collaboratively authored videos in playlists and videos

endpoint
currently, the videos endpoint returns the video uploader name,
and not "author1, author2, author3" as is the case for videoRenderer
and playlistVideoRenderer - this might change in the future in order for
the endpoints to return the same data

ythdd_inv_tl.py

@@ -379,8 +379,8 @@ def videos(data):
 
 	main_results = wdata['ec2']['contents']['twoColumnWatchNextResults']
 	primary_results = safeTraverse(main_results, ['results', 'results', 'contents'])
-	# video_primary_renderer   = safeTraverse(primary_results, [0, 'videoPrimaryInfoRenderer'])
+	# video_primary_renderer   = safeTraverse(primary_results, [..., 'videoPrimaryInfoRenderer'])
-	video_secondary_renderer = safeTraverse(primary_results, [1, 'videoSecondaryInfoRenderer'])
+	video_secondary_renderer = safeTraverse(primary_results, [..., 'videoSecondaryInfoRenderer'])
 
 	video_details = safeTraverse(wdata, ['ec1', 'videoDetails'])
 	microformat   = safeTraverse(wdata, ['ec1', 'microformat', 'playerMicroformatRenderer'], default={})
@@ -454,11 +454,15 @@ def videos(data):
 	author             = safeTraverse(video_details, ['author'], default="Unknown Author")
 	ucid               = safeTraverse(video_details, ['channelId'], default="UNKNOWNCHANNELID")
 	subs               = ydata['channel_follower_count']
-	author_thumbnail   = ythdd_extractor.generateChannelAvatarsFromUrl(safeTraverse(video_secondary_renderer, ['owner', 'videoOwnerRenderer', 'thumbnail', 'thumbnails', 0, 'url'], default=DEFAULT_AVATAR))
+	author_thumbnail   = safeTraverse(video_secondary_renderer, ['owner', 'videoOwnerRenderer', 'thumbnail', 'thumbnails', 0, 'url'])
-
-	# so far it seems to be impossible to tell if a channel is verified or not, 
-	# that is - without making another request
 	author_verified    = ythdd_extractor.isVerified(safeTraverse(video_secondary_renderer, ['owner', 'videoOwnerRenderer', 'badges', 0], default=[]))
+	if author_thumbnail is None:
+		# there might be multiple authors (on a collaborative video)
+		# if so, then try to extract first channel's (uploader's) avatar
+		livm = safeTraverse(video_secondary_renderer, ["owner", "videoOwnerRenderer", "attributedTitle", "commandRuns", 0, "onTap", "innertubeCommand", "showDialogCommand", "panelLoadingStrategy", "inlineContent", "dialogViewModel", "customContent", "listViewModel", "listItems"], default=[])
+		author_thumbnail = safeTraverse(livm, [0, "listItemViewModel", "leadingAccessory", "avatarViewModel", "image", "sources", 0, "url"], default=DEFAULT_AVATAR)
+		author_verified  = author_verified or safeTraverse(livm, [0, "listItemViewModel", "title", "attachmentRuns", 0, "element", "type", "imageType", "image", "sources", 0, "clientResource", "imageName"]) in ("AUDIO_BADGE", "CHECK_CIRCLE_FILLED")
+	author_thumbnail = ythdd_extractor.generateChannelAvatarsFromUrl(author_thumbnail)
 
 	format_streams     = []
 	# adaptive_formats, format_streams = rebuildFormats(adaptive_formats)

ythdd_struct_parser.py

@@ -346,7 +346,7 @@ def parseRenderers(entry: dict, context: dict = {}) -> dict:
 
 			video_id       = safeTraverse(entry, ["playlistVideoRenderer", "videoId"], default="UnknownVideoId")
 			title          = safeTraverse(entry, ["playlistVideoRenderer", "title", "runs", 0, "text"], default="Unknown video title")
-			author_ucid    = safeTraverse(entry, ["playlistVideoRenderer", "shortBylineText", "runs", 0, "navigationEndpoint", "browseEndpoint", "browseId"], default="UNKNOWNCHANNELID")
+			author_ucid    = safeTraverse(entry, ["playlistVideoRenderer", "shortBylineText", "runs", 0, "navigationEndpoint", "browseEndpoint", "browseId"])
 			author_name    = safeTraverse(entry, ["playlistVideoRenderer", "shortBylineText", "runs", 0, "text"], default="Unknown author")
 			video_index    = int(safeTraverse(entry, ["playlistVideoRenderer", "index", "simpleText"], default="1")) - 1
 			length         = parseLengthFromTimeBadge(safeTraverse(entry, ["playlistVideoRenderer", "lengthText", "simpleText"], default="0:0"))
@@ -357,6 +357,20 @@ def parseRenderers(entry: dict, context: dict = {}) -> dict:
 			if not published_date:
 				published_date = "now"
 
+			if author_ucid is None:
+				# likely a collaborative video, let's try
+				# to fetch the uploader's ucid with that in mind
+				livm = safeTraverse(entry, ["playlistVideoRenderer", "shortBylineText", "runs", 0, "navigationEndpoint", "showDialogCommand", "panelLoadingStrategy", "inlineContent", "dialogViewModel", "customContent", "listViewModel", "listItems"], default=[])
+				# name extraction logic the same as in videoRenderer
+				all_authors = []
+				for collaborative_author in livm:
+					collaborative_author_name = safeTraverse(collaborative_author, ["listItemViewModel", "title", "content"])
+					if collaborative_author_name is not None:
+						all_authors.append(collaborative_author_name)
+				if all_authors != []:
+					author_name = ", ".join(all_authors)
+				author_ucid = safeTraverse(livm, [0, "listItemViewModel", "title", "commandRuns", 0, "onTap", "innertubeCommand", "browseEndpoint", "browseId"], default="UNKNOWNCHANNELID")
+
 			return {
 				"type": "video",
 				"title": title,