* 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
* Added `PP+exe:args` syntax
If `PP+exe:args` is specifically given, only it used.
Otherwise, `PP:args` and `exe:args` are combined.
If none of the `PP`, `exe` or `PP+exe` args are given, `default` is used
`Default` is purposely left undocumented since it exists only for backward compatibility
* Also added proper handling of args in `EmbedThumbnail`
Related: https://github.com/ytdl-org/youtube-dl/pull/27723
* Added options: --video-multistreams, --no-video-multistreams, --audio-multistreams, --no-audio-multistreams
* New format selectors: best*, worst*, bestvideo*, bestaudio*, worstvideo*, worstaudio*
* Added b,w,v,a as alias for best, worst, video and audio respectively in format selection
* Changed video format sorting to show video only files and video+audio files together.