Create voice recordings of text with Ubuntu

concat_audios.sh

#join multiple files together
ffmpeg -f concat -safe 0 -i tmp.txt -c copy new.mp3

ffprob-duration.sh

#ffprobe gathers information from multimedia streams and prints it in human- and machine-readable fashion.

#output to screen
ffprobe -show_entries format=filename,duration -i ./out.mp3

#output to json file
ffprobe -show_entries format=filename,duration -i ./out.mp3 -of json 2>NUL > out.json

tmp.txt

file 'bannerHeading.mp3'
file 'decisionHeading.mp3'
file 'welcomeIntroduction.mp3'
file 'optionHeading.mp3'
file 'optionIntroduction.mp3'
file 'forTitle.mp3'
file 'forText.mp3'
file 'againstTitle.mp3'
file 'againstText.mp3'
file 'directionText.mp3'
file 'resultTitle.mp3'
file 'correctFeedbackP1.mp3'
file 'correctFeedbackP2.mp3'
file 'incorrectFeedbackP1.mp3'
file 'incorrectFeedbackP2.mp3'

TTS.sh

#dependencies
sudo apt-get install libttspico-utils
sudo apt-get install ffmpeg

#generate wav from text
pico2wave -w=out.wav -l=en-GB "Hello there"

#convert wav to mp3
ffmpeg -i ./out.wav -b:a 160k -metadata artist=homebrook ./out.mp3 -y