Script and systemd service to record twitch stream automatically

save_stream.service

[Unit]
Description=Save Twitch stream
After=network.target

[Service]
WorkingDirectory=/home/squaresmile/twitch_streams
ExecStart=/bin/bash /home/squaresmile/twitch_streams/save_stream.sh
User=cereal

[Install]
WantedBy=multi-user.target

save_stream.sh

#!/usr/bin/env bash

set -e

if [[ $(find . -name "*_.mp4" -printf '.' | wc -m) -ne "0" ]]; then
    exit 1
fi

STREAM=$(date +"%Y_%m_%d_%H_%M_%S")
echo "Saving stream $STREAM"
streamlink https://www.twitch.tv/<twitch_username> -o "$STREAM"_.mp4 --twitch-disable-hosting \
--twitch-disable-ads --twitch-disable-reruns --retry-streams 60 --retry-max 5 || true

if [ -f "$STREAM"_.mp4 ]; then    
    # Some players (Chrome) can't play the original mp4 file from streamlink (probably because when the stream ends, strealink doesn't finish writing cleanly)
    # so we remux the file
    ffmpeg -i "$STREAM"_.mp4 -c: copy "$STREAM".mp4
    rm "$STREAM"_.mp4
    
    # Uncomment if you want to send a pushbullet notification on finish
    # curl -u <pushbullet_api_token>: https://api.pushbullet.com/v2/pushes -d type=note --data-urlencode title="$STREAM stream finished"
fi

save_stream.timer

[Unit]
Description=Check and save stream

[Timer]
OnCalendar=*-*-* *:00/15:00
RandomizedDelaySec=60
AccuracySec=1us

[Install]
WantedBy=timers.target