Some codes are borrowed from #7968, which is by @jlhg Closes #7968
Apparently Niconico now blocks playing without an account Closes #11170
- Eliminate _transform_rtmp_url * Generalize triforce mgid extraction + [cmt] Add support for full-episodes (closes #11623)
Just a minor fix for openload
- remove check for requires_subscription - extract more formats - extract subtitles
method attribute may not be present
These methods are used across codebase with old number of arguments
Seen on video with id 1t24XAntNCY
Individual egghead videos are already handled by the generic/Wistia extractors.