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仅做简单的测试，只想看看怎么播放视频，不想弄这个，有兴趣的可以深入了解，谢谢！

要想更深入了解请参考：Delphi多媒体设计之TMediaPlayer组件（一） - pchmonster - 博客园  https://www.cnblogs.com/pchmonster/archive/2012/07/12/2588846.html

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---------------------------Unit1 开始------------

unit Unit1;

interface

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

type
TForm1 = class(TForm)
MediaPlayer1: TMediaPlayer;
Animate1: TAnimate;
Button1: TButton;
Panel1: TPanel;
Timer1: TTimer;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
procedure MediaPlayer1Click(Sender: TObject; Button: TMPBtnType;
var DoDefault: Boolean);
procedure Timer1Timer(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation
var
uDisplayRect:TRect;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
//这个cool.avi在delphi7的安装目录下
MediaPlayer1.FileName:=\'C:\Program Files\Borland\Delphi7\Demos\CoolStuf\cool.avi\' ;
end;

procedure TForm1.MediaPlayer1Click(Sender: TObject; Button: TMPBtnType;
var DoDefault: Boolean);
begin
if Button=btPlay then //case Button of btPlay:begin (代码) end; end;比较好
begin
MediaPlayer1.Open;//打开设备，还有对应的Close关闭设备
MediaPlayer1.DisplayRect:=uDisplayRect; //设置显示范围（本人设置的这个范围有点大了，视频失真）
MediaPlayer1.Play;//播放
end;
{case Button of
btPlay:
begin
MediaPlayer1.Open;//打开设备，还有对应的Close关闭设备
MediaPlayer1.DisplayRect:=uDisplayRect; //设置显示范围（本人设置的这个范围有点大了，视频失真）
MediaPlayer1.Play;//播放
end;
end; }
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
Label1.Caption:=IntToStr(MediaPlayer1.Position);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
uDisplayRect.Top:=10;
uDisplayRect.Left:=10;
uDisplayRect.Right:=500;
uDisplayRect.Bottom:=300;
MediaPlayer1.Display:=Panel1; //设置视频显示的地方（这里显示在panel上）
//Devicetype这个很重要，不要乱设置
end;

end.

-----------------------Unit1 结束-------------

----------------Form1  开始----------

object Form1: TForm1
Left = 373
Top = 261
Width = 728
Height = 553
Caption = \'Form1\'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = \'MS Sans Serif\'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
PixelsPerInch = 96
TextHeight = 13
object Label1: TLabel
Left = 144
Top = 480
Width = 129
Height = 13
AutoSize = False
Caption = \'Label1\'
end
object MediaPlayer1: TMediaPlayer
Left = 136
Top = 424
Width = 253
Height = 30
AutoEnable = False
AutoRewind = False
FileName = \'C:\Program Files\Borland\Delphi7\Demos\CoolStuf\cool.avi\'
TabOrder = 0
OnClick = MediaPlayer1Click
end
object Animate1: TAnimate
Left = 528
Top = 440
Width = 65
Height = 57
end
object Button1: TButton
Left = 40
Top = 424
Width = 75
Height = 25
Caption = \'Button1\'
TabOrder = 2
OnClick = Button1Click
end
object Panel1: TPanel
Left = 16
Top = 16
Width = 665
Height = 377
TabOrder = 3
end
object Timer1: TTimer
Interval = 100
OnTimer = Timer1Timer
Left = 64
Top = 472
end
end

---------------Form1 结束---------------