gets videos from the internet and stores them as MKV

get-video.sh

#!/bin/bash
#
# Gets videos, for example from YouTube, as best-quality separate tracks
# and stitches them, video by video, into a MKV – avoiding excess clutter files.
#
# wrapper to: mkvtoolnix youtube-dl iconv jq file
#
# author: W-Mark Kubacki <wmark@hurrikane.de>

set -e -o pipefail

if [[ -t 1 ]] && tput colors >&/dev/null; then
  V_BOLD_RED=$(tput bold; tput setaf 1)
  V_BOLD_GREEN=$(tput bold; tput setaf 2)
  V_VIDOFF=$(tput sgr0)
fi

info() {
  printf "${V_BOLD_GREEN}${1}${V_VIDOFF}"
}
error() {
  >&2 printf "${V_BOLD_RED}${1}${V_VIDOFF}"
}

stitch_result() {
  source_files=()
  tracks_from=()
  attach=()

  while read FNAME; do
    source_files+=("${FNAME}")
    if [[ "${FNAME}" =~ (json|jpeg|jpg|png|webp)$ ]]; then
      attach+=("--attachment-mime-type" $(file --brief --mime-type "${FNAME}"))
      attach+=("--attach-file" "${FNAME}")
      continue
    fi
    tracks_from+=("${FNAME}")
  done < <(find -type f -name "*${1%%=*}*")

  description_file="$(find -type f -name "*${1%%=*}*.json")"
  output_filename="$(jq -r .'title' "${description_file}" | iconv -c -t UTF-8//TRANSLIT | tr -d '"*/:<>?|&' | sed -e 's:\.\.\.:…:').mkv"

  if [[ -s "${output_filename}" ]]; then
    error "Output file already exists: ${output_filename}\n"
    exit
  fi

  mkvmerge \
    --title "$(jq -r .'fulltitle' "${description_file}")" \
    -o "${2}/${output_filename}" \
    "${tracks_from[@]}" \
    "${attach[@]}"

  info "Finished: ${output_filename}\n"
  rm "${source_files[@]}"
}

download_content() {
  local LINK="${1}"
  info "Started: $LINK\n"

  local WORKDIR="$(mktemp -d -t ytdownload.XXXXXX)"
  mkdir -p "${WORKDIR}/video" "${WORKDIR}/audio"
  cd "${WORKDIR}"

  (cd "audio"; youtube-dl --no-overwrites --format bestaudio --write-info-json --write-thumbnail "${LINK}")
  (cd "video"; youtube-dl --no-overwrites --format bestvideo "${LINK}")

  stitch_result "${LINK##*=}" "${2}"
  cd ..
  rm -r "${WORKDIR}"
}

: ${destdir:="$(pwd)"}

for LINK; do
  if [[ ! "$LINK" == *"://"* ]]; then
    LINK="https://www.youtube.com/watch?v=${LINK}"
  fi
  download_content "$LINK" "${destdir}" &
done

wait
info "Done.\n"