# --external-downloader also works for youtube-dl
--external-downloader aria2c

# workaround youtube throttle
# mar 17 2022 if use this command download is very slow, not sure why
#--throttled-rate 100K
# player_client=android,web seems become default since 2021.07.21 version
#--extractor-args youtube:player_client=android

# manpage says yt-dlp use --sub-langs, youtube-dl use --sub-lang, but experiment shows yt-dlp also use --sub-lang
--sub-lang zh-Hans,zh-CN,zh-Hant,zh-SG,zh-TW,zh-HK,en,en-US,en-GB

# linux max filename length is 255 bytes, UTF-8 1 character max 4 byptes
# yt-dlp and aria2c will add about max 38 chars behind video name, for example: ' [EXF4g-2jOJo].f616.mp4.part.frag.urls'
# I choose a safety factor of 2 for max chars added
# (255-38*2)/4==44
--trim-filenames 44