我有一个非常简单的程序，使用DSPack从 Delphi 2010年。我有一个带有TFilterGraph和TVideoWindow的表单。视频播放和渲染效果很好。我似乎不知道如何使视频循环回到开始时，它结束了。
如何使用DSPack使视频自动循环？

代码

unit Unit21;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DSPack, ExtCtrls;

type
  TForm21 = class(TForm)
    FilterGraph1: TFilterGraph;
    OpenDialog1: TOpenDialog;
    Button1: TButton;
    Button2: TButton;
    Panel1: TPanel;
    VideoWindow1: TVideoWindow;
    Panel2: TPanel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form21: TForm21;

implementation

{$R *.dfm}

procedure TForm21.Button1Click(Sender: TObject);
begin
  OpenDialog1.InitialDir := ExtractFilePath(ParamStr(0));
  if OpenDialog1.Execute then
  begin
    if not FilterGraph1.Active then FilterGraph1.Active:= True;
    VideoWindow1.FilterGraph:= FilterGraph1;
    FilterGraph1.RenderFile(OpenDialog1.Filename);
    FilterGraph1.Play;
  end;
end;

procedure TForm21.Button2Click(Sender: TObject);
begin
  FilterGraph1.Stop;
end;

procedure TForm21.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  FilterGraph1.ClearGraph;
  FilterGraph1.Active:= False;
end;

end.

DFM

object Form21: TForm21
  Left = 0
  Top = 0
  Caption = 'Form21'
  ClientHeight = 441
  ClientWidth = 644
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  OnCloseQuery = FormCloseQuery
  PixelsPerInch = 96
  TextHeight = 13
  object Panel1: TPanel
    Left = 0
    Top = 0
    Width = 644
    Height = 384
    Align = alClient
    Caption = 'Panel1'
    TabOrder = 0
    object VideoWindow1: TVideoWindow
      Left = 1
      Top = 1
      Width = 642
      Height = 382
      Mode = vmVMR
      FilterGraph = FilterGraph1
      VMROptions.Mode = vmrWindowed
      Color = clWhite
      Align = alClient
    end
  end
  object Panel2: TPanel
    Left = 0
    Top = 384
    Width = 644
    Height = 57
    Align = alBottom
    Caption = 'Panel2'
    TabOrder = 1
    object Button1: TButton
      Left = 24
      Top = 16
      Width = 75
      Height = 25
      Caption = 'Play'
      TabOrder = 0
      OnClick = Button1Click
    end
    object Button2: TButton
      Left = 128
      Top = 16
      Width = 75
      Height = 25
      Caption = 'Stop'
      TabOrder = 1
      OnClick = Button2Click
    end
  end
  object FilterGraph1: TFilterGraph
    GraphEdit = True
    LinearVolume = True
    Left = 424
    Top = 144
  end
  object OpenDialog1: TOpenDialog
    Left = 344
    Top = 128
  end
end