Create a video for Twitter from an audio and a dummy image file - transcode audio into a video for twitter

audio2video.sh

#!/bin/bash

if [[ $# -ne 2 ]]; then
  echo "audio2video: create a video for Twitter from audio and a dummy image."
  echo "Usage:"
  echo "audio2video audio.mp3 dummyimage.png"
  echo
  echo "Remark: width and height need to be divisible by 2."
  exit
fi

ffmpeg -loop 1 -i "$2" -i "$1" -filter_complex "loop=-1:1:0" -c:v libx264 -x264-params keyint=1 -shortest -pix_fmt yuv420p -c:a aac ${1%.*}.mp4