VideoReader problem - Xvid video compression

I have a video which is compressed using the xvid video compressor. I am using the VideoReader function to open the file and am processing video frame by frame. Unfortunately, I have found that with the xvid compressed video every second frame is green. On doing some testing, I found that it isn't the actual frame in the file that is incorrect and it is something to do with reading the movie object. For instance, if I read the same frame consecutively, the first time I read it the image comes out as expected and the second time I read the same frame, the image comes out with all pixels green. Is this a bug in VideoReader? I am using a Mac operating system, but have tested this and found the same problem in both Windows 32 and 64 bit.

Details on the file are as follows -

General Settings:
  Duration = 11.6117
  Name = test.avi
  Path = /Users/GL/Documents/Data
  Tag = 
  Type = VideoReader
  UserData = []

Video Settings:
  BitsPerPixel = 24
  FrameRate = 81.5559
  Height = 544
  NumberOfFrames = 947
  VideoFormat = RGB24
  Width = 768

Answer 1

[Shawn Fernandes]

Hi,

You would have to make use of the while loop with the 'hasFrame' and 'readFrame' option.

movie = VideoReader('test.avi');

i=1;
while hasFrame(movie)
    video_data(i).cdata = readFrame(movie);
    i=i+1;
end

Reference : https://www.mathworks.com/help/matlab/ref/videoreader.readframe.html

Tested on Matlab 2018a Windows 10.

Note: Installed ffdshow and x264 codecs separetely

https://sourceforge.net/projects/ffdshow-tryout/

https://sourceforge.net/projects/x264vfw/

[Walter Roberson]

Did you test with an xvid video specifically?

Note: back when the question was asked in 2012, readFrame() did not exist; it was added in R2014b.

[Shawn Fernandes]

Hi Walter,

This is the screenshot of the video file player when played on VLC player.

Thanks,