render-video-from-gopro-photos.sh

#! /usr/bin/env bash

die() {
  echo "$1" >&2
  exit 1
}

counter=0
for img in G[0-9]*.JPG
do
  serial=$(printf "%06d" $counter)
  new_name="G${serial}.JPG"
  counter=$(expr $counter + 1)
  if [ -f "$new_name" ]; then
    echo "$new_name already exists"
    continue
  fi
  echo "$img => $new_name"
  mv $img $new_name
done

case $(uname -s) in
  Linux)
    echo "Merging images into single video file: output.mp4"
    ffmpeg -hwaccel cuda -hwaccel_output_format cuda -r 1 -i G%06d.JPG -c:v h264_nvenc -b:v 5M -pix_fmt cuda output.mp4 || \
      die "Failed to render output.mp4"
    echo "Resizing video to 1920x1440: output_1920x1440.mp4"
    ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i output.mp4 -c:v h264_nvenc -vf scale=1920:1440 -c:a copy output_1920x1440.mp4 || \
      die "Failed to render output_1920x1440.mp4"
    echo "Cropping file video as 1080p: output_1080p.mp4"
    ffmpeg -hwaccel cuda -i output_1920x1440.mp4 -c:v h264_nvenc -vf "crop=1920:1080:0:180" output_1080p.mp4 || \
      die "Failed to render output_1080p.mp4"
    ;;
  Darwin) 
    echo "Merging images into single video file: output.mp4"
      die "Failed to render output.mp4"
    echo "Resizing video to 1920x1440: output_1920x1440.mp4"
    ffmpeg -hwaccel auto -i output.mp4 -c:v h264_videotoolbox -q:v 90 -vf scale=1920:1440 -c:a copy output_1920x1440.mp4
    echo "Cropping file video as 1080p: output_1080p.mp4"
    ffmpeg -hwaccel auto -i output_1920x1440.mp4 -c:v h264_videotoolbox -q:v 90 -vf "crop=1920:1080:0:180" output_1080p.mp4
esac