I have a problem within VideoReader

Hi. I've try to read MP4 video in matlab.

Before I changed my computer, VideoReader worked well.

but recently I change my computer, and then I get a problem with reading the same video using VideoReader in matlab.

When I try

>> v = VideoReader('video.mp4');

I get a message like

Error using VideoReader/init (line 450)
Unable to determine the codec required.

So I search MPEG-4 video codec like ffdshow, Xvid, Z-codec ... I've try several codec except only Z-codec is work.

but I have another message like below,

>> v = VideoReader('video.mp4');
Warning: Unable to determine the number of frames in this file. 

>> get(v)
General Settings:
  Duration = 300.4340
  Name = action_200.mp4
  Path = C:\Users\code
  Tag = 
  Type = VideoReader
  UserData = []

Video Settings:
  BitsPerPixel = 24
  FrameRate = 29.9999
  Height = 480
  NumberOfFrames = []
  VideoFormat = RGB24
  Width = 800

and I cannot access to right frame. I mean

>> im1 = read(v, 10);
>> im2 = read(v, 10);

im1 and im2 are not same always. My current environments are

Processor: Intel® Core™ i7-3770 CPU @ 3.40GHz.

RAM: 8GB.

Graphic card: NVIDIA GeForce GTX 660.

OS: Windows 7 Enterprise KN 64bit.

MATLAB: R2013a 64bit.

I don't know what and where is wrong with this problem. Anyone can help me?