Bash script to allow viewing twitch streams with mpv at the desired video encoding. Inspired by the twitch-view/twitch-format scripts but in pure bash instead of having a perl dependency.

twitch-mpv.sh

#!/usr/bin/env bash
# Allows you to watch a twitch stream at the desired encoding rate
# using mpv + youtube-dl

twitch_name="$1"

if [[ -z "$twitch_name" ]]; then
    printf "Error: twitch username required.\n"
    exit 1
fi

declare -a formats

while read -r yt_output_line; do
  read -d' ' -ra line_parts  <<< "$yt_output_line"
  if [[ "${line_parts[0]}" =~ ^[0-9] || "${line_parts[0]}" =~ ^audio ]]; then 
    formats+=( "${line_parts[0]}" )
  fi
done < <(youtube-dl -F "https://twitch.tv/$twitch_name")

# twitch account does not exist/offline/banned? Bail.
if [[ "${#formats[@]}" == 0 ]]; then
  exit 0
fi

formats+=("quit")

select format in "${formats[@]}"; do
    if [[ -n "$format" ]]; then
        if [[ "$format" == "quit" ]]; then
            exit 0
        else
            break
        fi
    fi
done

mpv --ytdl-format="$format" "https://twitch.tv/$twitch_name"