A youtube-dl config-file that adds use of aria2 and ffmpeg-normazlie by default.

youtube-dl.conf

#
# /etc/youtube-dl.conf
#
# System-wide configuration-file for youtube-dl.
# As aria2 doesn't fix the bug resulting in failed downloads with "invalid range" error-messages, the use of aria2 is currently commented out and replaced with youtube-dl's native download.
# Used to set default to call aria2 for parallelization and ffmpeg-normalize to apply EBU R128 to audio.
# Note: all config-file parameters get overridden by setting to anything else at commandline.
#
# Version: b9AcE, 20201025-01
#

#--no-mtime -o "%(autonumber)s_-_%(title)s.%(ext)s" --restrict-filenames --retries infinite --ignore-errors --no-overwrites --continue --write-sub --convert-subs srt --format "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" --user-agent "Mozilla/5.0 (X11; Linux x86_64; rv:68.9) Gecko/20100101 Goanna/4.4 Firefox/52.9 PaleMoon/28.8.3" --external-downloader aria2c --external-downloader-args '--file-allocation=prealloc --user-agent="Mozilla/5.0 (X11; Linux x86_64; rv:68.9) Gecko/20100101 Goanna/4.4 Firefox/52.9 PaleMoon/28.8.3" --continue=true --max-concurrent-downloads=5 --max-connection-per-server=5 --split=5 --min-split-size=1M --summary-interval=0 --max-tries=0 --retry-wait=5 --http-accept-gzip=true --enable-http-keep-alive=true --enable-http-pipelining=true' --exec 'ffmpeg-normalize -c:a libfdk_aac --extension mp4 -e="-vbr 3" {}'

--no-mtime -o "%(autonumber)s_-_%(title)s.%(ext)s" --restrict-filenames --retries infinite --ignore-errors --no-overwrites --continue --write-sub --convert-subs srt --format "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" --user-agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.9) Gecko/20100101 Goanna/4.6 Firefox/68.9 PaleMoon/28.14.2"