YouTube downloader

#!/usr/bin/env bash

if [ ! -f "/input/feeds.txt" ]
then
    >&2 echo "Failed to open file /input/feeds.txt. Exiting."
    exit 1
fi

if [ ! -d "/output" ]
then
    >&2 echo "Failed to switch to directory /output. Exiting."
    exit 1
fi

cd /output

grep "^[^#;]" /input/feeds.txt | while read feed
do
    echo "[ytdl-pvr] Downloading feed: $feed"
    # Grab the RSS feed from YouTube, grab the recent video URLs, and use yt-dlp to download the video
    # The following arguments are used to download 1080p H.264 videos with AAC audio,
    # such that they can be natively played on devices released within the last 10 years while still having
    # good quality:
    # --format, --remux-video, --merge-output-video
    # The following arguments are used to write thumbnail and metadata to be compatible with Jellyfin.
    # --write-thumbnail, --convert-thumbnails, --embed-thumbnail, --embed-metadata, --embed-subs
    # To help Jellyfin sorting videos by release date, --no-mtime is set to prevent e.g. edits to
    # video comments from making a video seem to be released more recently
    # To prevent the script failing when feeds include a future video, --datebefore now is set
    curl --fail-with-body -L -s "$feed" | xq -r '.feed.entry[0:5] | .[].link."@href"' | yt-dlp \
        --batch-file - \
        --output="%(channel)s/%(upload_date)s %(title)s [%(id)s].%(ext)s" \
        --download-archive .ytdl-pvr-archive.txt  \
        --continue \
        --no-progress \
        --format 'bestvideo[vcodec^=avc1]+bestaudio[acodec^=mp4a]' \
        --remux-video "mp4" \
        --merge-output-format "mp4" \
        --no-mtime \
        --no-cache-dir \
        --write-thumbnail \
        --convert-thumbnails jpg \
        --embed-thumbnail \
        --embed-metadata \
        --embed-subs \
        --sub-lang en,en.* \
        --datebefore now
    # Continue processing in case of a processing error
    continue
done