timelapse_tools.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
)

func main() {

	if (len(os.Args) < 3) {
		log.Fatal("set first argument as directory, second argument as ffmpeg")
	}

	var path = os.Args[1]
	var ffmpeg = os.Args[2]

	if (path == "./") {
		log.Fatal("cwd must not be source directory")
	}

	fmt.Println("The speed needs to be fast, .05 is 20 times faster than normal and it is too slow to be impressive.")
	fmt.Println("Timelapses always look best with large zoomed out views, or slowly changing things.")

	files, err := ioutil.ReadDir(os.Args[1])
	if err != nil {
		log.Fatal(err)
	}

	var grid_s = ffmpeg
	var shrink = ""

	for _, file := range files {
		var n = file.Name()

		fmt.Println(ffmpeg + " -y -nostdin -i \"" + path + "/" + n + "\" -filter:v \"setpts=0.02*PTS\" -an \"./" + n + "\"")
		shrink += ffmpeg + " -y -nostdin -i \"./" + n + "\"" + " -s 1280x720 \"./small-" + n + "\"" + "\n"

		grid_s += " -i \"./small-" + n + "\""

	}

	grid_s += " -filter_complex \"[0:v][1:v][2:v]hstack=inputs=3[top];[3:v][4:v][5:v]hstack=inputs=3[mid];[6:v][7:v][8:v]hstack=inputs=3[bottom];[top][mid][bottom]vstack=inputs=3[v]\" -map \"[v]\" grid.mp4"

	fmt.Println(shrink)
	fmt.Println(grid_s)

}