Splice VOD list via ffmpeg (in remote container)

vod-splice.sh

#!/bin/bash
# Splice VOD list via ffmpeg (in remote container)

set -euo pipefail
shopt -s extdebug

export REMOTE=debsrv01.dm4productions.com
export VOD_DIR=/mnt/pool0/media/archive/twitch
export OHNO=twitch_disconnect_4s.m2t

remote_splice() {
    (($# > 1)) || { echo 'Requires a list of VOD streams to merge.'; exit 1; }
    [[ $1 == -i ]] && local int=1 && shift
    local files=("$@")
    [[ ${files[0]} != "${files[0]%/*}" ]] &&
        local subdir="${files[0]%/*}" && files=("${files[@]##*/}")
    local files2=("${files[@]/m2t/json}")
    local cat="concat:${files[*]}" && cat="${cat// /${int:+|..\/$OHNO}|}"
    # shellcheck disable=SC2087
    ssh -qt $REMOTE <<EOF
podman start ffmpeg
podman exec -it ffmpeg bash -c '
    pushd $VOD_DIR && pushd "${subdir:-.}"
    nice -n 19 ionice -c 3 ffmpeg -hide_banner -i "$cat" -c copy ".${files[0]}" &
    disown -h %1 && wait
    touch -r "${files[-1]}" ".${files[0]}"
    rm -f ${files[@]} && mv ".${files[0]}" "${files[0]}"
    rm -f ${files2[@]:1}
    exit
'
podman stop ffmpeg
EOF
}

[[ ${BASH_SOURCE[0]} == "$0" ]] && remote_splice "$@"

Basically merge the fragments with vod-splice /mnt/pool0/media/archive/twitch/foo/foo_XXXX-YY-ZZ_*.m2t