Unity3D使用AvPro模拟拖拽播放序列

使用avpro的seek方法将视频画面播放到对应帧，尽量使用1920*1080的视频相对流畅。
如果需要正反自由播放序列，在引擎中包体会很大，使用单个视频模拟序列减少包体大小。

using System;
using System.Collections;
using System.Collections.Generic;
using RenderHeads.Media.AVProVideo;
using UnityEngine;
using UnityEngine.EventSystems;

public class MediaDrag : MonoBehaviour
{
   
    public MediaPlayer mp;
    public double curFrame;
    private double totalFrame;

    void Start()
    {
   
        UGUIDragHandler.Get(transform).onBeginDrag += OnBeginDragFunc;
        UGUIDragHandler.Get(transform).onDrag += OnDragFunc;
        UGUIDragHandler.Get(transform).onEndDrag += OnEndDragFunc;

        UGUIDragHandler.Get(transform).onDown += OnClickDownFunc;
        UGUIDragHandler.Get(transform).onUp += OnClickUpFunc;

    }

    private Vector2 clickStartPos;
    private Vector2 clickEndPos;
    private void OnClickDownFunc(GameObject target, PointerEventData eventData)
    {
   
        clickStartPos = eventData.position;
    }

    private void OnClickUpFunc(GameObject target