CameraDump.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

[RequireComponent(typeof(Camera))]
public class CameraDump : MonoBehaviour
{
    private int imageCount;

    private RenderTexture targetTexture;
    private const string folderName = "CameraDump";
    private string dumpDirectory
    {
        get
        {
            return Application.dataPath + @"/../" + folderName + @"/";
        }
    }
    private string dumpPrefix
    {
        get
        {
            return gameObject.name + "/";
        }
    }
	private string workingPath;

    // hook and initialize
    private void Start()
    {
		workingPath = dumpDirectory + DateTime.Now.ToString("yyyy-MM-d_HHmmss") + "/" + dumpPrefix;
		
        // check for path validity
        System.IO.Directory.CreateDirectory(workingPath);
    }

    // dump
    private void OnPostRender()
    {
        Texture2D stagedTexture = new Texture2D(Screen.width, Screen.height);

        stagedTexture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height),
            0,
            0);

        stagedTexture.Apply();

        var pngData = stagedTexture.EncodeToPNG();

        string filePath = workingPath + imageCount++ + ".png";

        System.IO.File.WriteAllBytes(filePath, pngData);
    }
}

CaptureSettings.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CaptureSettings : MonoBehaviour
{
    public int captureFramerate = 60;
    public float captureTime;

	// Use this for initialization
	void Start ()
    {
        Time.captureFramerate = captureFramerate;
	}

    void Update()
    {
        if (Time.time > captureTime)
        {
#if UNITY_EDITOR
            UnityEditor.EditorApplication.isPlaying = false;
#endif
            Application.Quit();
        }

        Debug.Log(Time.time);
    }
}