Update youtube shorts support added

youtube-dl-fragment.sh

#!/usr/bin/env bash
# rev 10

#
# Input inteface
#

YOUTUBE_VID_ID=""
DURATION=""
START_TIME="0:00"
OUTPUT="output.mp4"
SILENT=""
AUDIO_ONLY=""
FFFILTER="crop=435:285:0:805"
URL_PREFIX="https://www.youtube.com/watch?v="

usage="$(basename "$0") [-h] [-s n] -- program to download video fragment from YouTube

where:
    -h  show this help text

    -v  set YouTube Video Id
    -d  set YouTube Video duration
    -s  set YouTube Video start time (default: ${START_TIME})
    -o  output file (default: ${OUTPUT})
    -a  audio only
    -l  if it's a short video"

while getopts ':hyalv:s:d:o:f:' option; do
  case "$option" in
    h) echo "$usage"
       exit
       ;;
    v) YOUTUBE_VID_ID=$OPTARG
       ;;
    s) START_TIME=$OPTARG
       ;;
    d) DURATION=$OPTARG
       ;;
    o) OUTPUT=$OPTARG
       ;;
    f) FFFILTER=$OPTARG
       ;;
    y) SILENT="-y"
       ;;
    a) AUDIO_ONLY="-y"
       OUTPUT="output.aac"
       ;;
    l) URL_PREFIX="https://www.youtube.com/shorts/"
       ;;
    :) printf "! Missing argument for -%s. Check usage:\n\n" "$OPTARG" >&2
       echo "$usage" >&2
       exit 1
       ;;
   \?) printf "! Illegal option: -%s. Check usage:\n\n" "$OPTARG" >&2
       echo "$usage" >&2
       exit 1
       ;;
  esac
done
shift $((OPTIND - 1))

#
# Input validation
#

[ -z "$YOUTUBE_VID_ID" ] && { printf "! Missing YouTube Video Id.\nAdd -v viDe01dENtiF.\n Exit"; exit 1; }
[ -z "$OUTPUT" ]      && { printf "! Missing output file.\nAdd -o output.mp4.\n Exit"; exit 1; }

#
# Processing
#

URLS=( $(youtube-dl --youtube-skip-dash-manifest -g "${URL_PREFIX}${YOUTUBE_VID_ID}") )

VIDEOURL="${URLS[0]}"
AUDIOURL="${URLS[1]}"
YOUTUBE_TIME=$(echo "${START_TIME}" | tr ':' '\n' | tac | tr -s '\n' ':' | awk -F: '{ print ($3 * 3600) + ($2 * 60) + $1 }')

INPUTS_FFAGS="-ss ${START_TIME} -i "${AUDIOURL}""

if [ ! -n "$AUDIO_ONLY" ]; then
   INPUTS_FFAGS="${INPUTS_FFAGS} -ss ${START_TIME} -i "${VIDEOURL}""
fi

DURATION_FFLAGS=""
if [ ! -z "$DURATION" ]; then
   DURATION_FFLAGS="-t ${DURATION}"
fi

FF_OUTPUT="-map 0:a -c:a aac"
if [ ! -n "$AUDIO_ONLY" ]; then
   FF_OUTPUT="${FF_OUTPUT} -map 1:v -c:v libx264"
fi
FF_OUTPUT="${FF_OUTPUT} ${OUTPUT}"

echo "ffmpeg ${SILENT} ${INPUTS_FFAGS} ${DURATION_FFLAGS} ${FF_OUTPUT}"
ffmpeg ${SILENT} ${INPUTS_FFAGS} ${DURATION_FFLAGS} ${FF_OUTPUT}

mv ${OUTPUT} ${OUTPUT}_without_meta
ffmpeg -i ${OUTPUT}_without_meta -metadata comment="${URL_PREFIX}${YOUTUBE_VID_ID}&t=${YOUTUBE_TIME%.*} duration:${DURATION}" ${OUTPUT}

if [ ! -n "$AUDIO_ONLY" -a "${FFFILTER}" != "" ]; then
   filename=$(basename -- "$OUTPUT")
   CROPPED_OUTPUT="${filename%.*}-cropped.${filename##*.}"
   ffmpeg ${SILENT} -i ${OUTPUT} \
      -filter:v "${FFFILTER}"    \
      ${CROPPED_OUTPUT}
fi