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Reading MP4 Video files with Matlab in Win7

Asked by Emmanuel on 9 Mar 2011

Hi,

I plan to do image processing on frames from .mp4 (h264) video files, but it seems I cannot get matlab to read the video files first.

The VideoReader class help does not list .mp4 as a supported file type, but accepts "any format supported by Microsoft DirectShow". The Windows player on my machine does read my mp4s, but matlab does not. Updating my codecs with the k-lite codec pack does nothing better.

I searched for solutions before posting here :

- videoIO library http://www.mathworks.com/matlabcentral/newsreader/view_thread/252119 Unfortunately requires installation process that is beyond my knowledge (compilation, environment variables ...)

- video.MultimediaFileReader http://www.mathworks.com/matlabcentral/newsreader/view_thread/303186 This does not work either, although I have the Video Processing blockset installed.

I know I can transform my mp4 into AVI using VirtualDub or something, but doing the whole process inside Matlab would save hours of work as I have many videos to analyse.

Thank you if anyone can help.

Emmanuel.

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Emmanuel

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7 Answers

Answer by Emmanuel on 14 Jun 2011
Accepted answer

R2011b pre-release now supports mpeg-4 and .mov in videoreader. http://www.mathworks.com/help/pdf_doc/matlab/relnotes_pr.pdf (see p. 13) I have not tested it yet (will probably wait for the final release), but this is good news!

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Emmanuel
Answer by Joseph on 25 May 2011

I am having the same issue as you. I downloaded the videoIO toolbox with the precompiled binaries for Windows XP, however it does not read in my mp4 video files. I don't think it is a missing codec, as WMP plays the file just fine.

There is apparently VideoReader in Matlab 2010b and newer; however I am running R2009a and only have access to R2010a at the moment. Looking into getting R2010b or newer. Wish there was an easier solution. Did you ever figure out your problem? I see your post is approximately 3 months old.

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Joseph
Answer by Harsha Vardhan Rao Avunoori on 26 May 2011

In the earlier versions of MATLAB with mmreader you can read a video file and this function supports most of the video formats.If you have the latest version of MATLAB then you should try using VideoReader()

For more information refer to the below link

http://www.mathworks.com/help/techdoc/ref/videoreaderclass.html

Let me know if it works for you :)

-Harsha

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Harsha Vardhan Rao  Avunoori
Answer by Emmanuel on 27 May 2011

I have 2010b and both mmreader and Videoreader fail to open my .mp4 files, even though Windows reader accepts to read them.

The problem remains.

The solution I chose for my last work is to transform .mp4 into separate .jpg frames with another software, and work on frames with matlab.

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Emmanuel
Answer by Harsha Vardhan Rao Avunoori on 27 May 2011

Which software did you use to extract frames ???

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Harsha Vardhan Rao  Avunoori
Answer by Emmanuel on 30 May 2011

I used a famous computer graphics suite, but I wish I could use Matlab !

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Emmanuel
Answer by Marc Vivet on 17 Apr 2012

You can use the Matlab VideoUtils toolbox:

http://sourceforge.net/projects/videoutils/

It is very easy to use.

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Marc Vivet

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