Been using this script to record my favorite twitch channel using a raspberry pi, running this 24/7. Enjoy!

recorder.sh

#!/bin/sh
### Twitch Recorder script ###
# This script checks whether a Twitch user is streaming and if so,
# will start recording it.
#
# Requires: curl, jq and livestreamer

clientId="TWITCH_CLIENT_ID"
recordingDir="/mnt/recordings"
channel=${1:-"twitchplayspokemon"}

setRecDir()
{
  sudo umount $recordingDir
  sudo mount -a

  if [ -d "$recordingDir" ]; then
    actualDir=$recordingDir
  else
    actualDir="/home/pi/recordings"
    mkdir -p $actualDir
    echo "Unable to record to set recording directory. Recording to preset directory. Check recording directory before it is full."
  fi
}

while true; do
  printf "\rChecking stream... "
  streamurl=$(livestreamer "twitch.tv/$channel" "1080p60,720p60,best" -Q --stream-url)

  if [ $? -eq 0 ]; then
    json=$(curl -s "https://api.twitch.tv/kraken/channels/$channel?client_id=$clientId" --max-time 10)
    date=$(date +"%d %m %Y %H-%M-%S")
    status=$(echo $json | jq '.status' | sed -e 's/[^A-Za-z0-9 ._-]/_/g' -e 's/^_*//' -e 's/_*$//')
    setRecDir
    streamName="$channel - $date - $status.mp4"
    filename="$actualDir/$streamName"
    echo "Start recording $streamName"
    livestreamer "twitch.tv/$channel" "1080p60,720p60,best" -o "$filename"
    echo "Stopped recording $streamName..."
  else
    msg="Not streaming."
  fi

  n=${2:-30}
  while [ $n -gt 0 ]; do
    printf "\r$msg Refreshing in %s " $n
    sleep 1
    n=$((n-1))
  done
  printf "\r                                      "
done

exit 0

setup.sh

#!/bin/sh
cd
# Execute these commands to install and build the dependencies
sudo apt-get update && sudo apt-get -y upgrade && sudo apt-get -y install screen wget curl nano git build-essential openssl jq libssl-dev python-setuptools libx264-dev
sudo easy_install livestreamer
livestreamer --twitch-oauth-authenticate # generate a twitch oauth token and put it in .livestreamerrc
echo "twitch-oauth-token=TOKEN" > .livestreamerrc

cd
git clone https://github.com/FFmpeg/FFmpeg.git
cd FFmpeg
sudo ./configure --arch=armel --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree --enable-openssl
make
sudo make install