PR: https://github.com/ytdl-org/youtube-dl/pull/29688Closes: #617, https://github.com/ytdl-org/youtube-dl/issues/29665
* Livestreams are untested
* If using ffmpeg as downloader, v4.3+ is needed since `-http_seekable` option is necessary
* Instead of making a seperate key for each arg that needs to be passed to ffmpeg, I made `_ffmpeg_args`
* This deprecates `_seekable`, but the option is kept for compatibility
Authored by: nchilada, pukkandan