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Convert YUV CIF 4:2:0 video file to image files

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17 Nov 2004 (Updated )

Load the YUV file, and convert it to 2D image file (matrix form).

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convert YUV CIF 4:2:0 video file to image files

MATLAB release MATLAB 7 (R14)
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Comments and Ratings (26)
26 Sep 2014 yogesh  
17 Sep 2014 Hossam Amer

What would you suggest me to do if I would like to extract some frames from two YUV files to produce extracted videos and then combine the extracted videos?

The YUV file is the output of HEVC coding.

21 Nov 2013 ahmed  
21 Nov 2013 ahmed

AAAA

29 Sep 2013 Chaine San Buenaventura

What is idxFrame in loadFileYUV? I'd appreciate any respone :)

29 Sep 2013 Chaine San Buenaventura

What is the output the loadFileYUV?

06 Apr 2013 jake

any onecan help how to use"loadFileYuv"this function?

i type

>> loadFileYuv(test1.yuv,176,144,91)
Undefined variable "test1" or function "test1.yuv".

thx

23 Mar 2013 Today

It works well. Thanks

31 Jan 2013 Muhamamd

Any body can help how to use this code?

26 Oct 2012 Chethan Pandarinath

This code is great. It can be sped up dramatically though by rewriting the clipValue function in a vectorized fashion. That is, replace the code in clipValue.m with these two lines:

val(val < valMin) = valMin;

val(val > valMax) = valMax;

for me this sped up conversion from >8s to <0.3s for a 2560 pixels x 1280 pixels image.

26 Oct 2012 Chethan Pandarinath  
17 Jun 2012 Vijay Ukani

Can I convert a YUV file to .ras image sequence? Someone plz help

13 Jun 2012 65uyh

I Am try to execute function [mov,imgRgb] = loadFileYuv(fileName, width, height, idxFrame) but matlab send to me this message :-
??? function [mov,imgRgb] = loadFileYuv(fileName, width, height, idxFrame)
|
Error: Function definitions are not permitted in this context.

05 May 2012 Shashi barot

As of now, I am using CIF video,but how does it work for interlaced video?

11 Apr 2012 Shashi barot

I am little confused how he's separating Y,U and V components here,because I am not sure how data is saved in a YUV file. when he first uses uses buf = fread(fileId, width * height, 'uchar'); and after reshaping this data he uses fread(fileId,width/2*height/2,'uchar')

that is 1/4 of the data used in previous 'fread' function and because there is no fseek between these 2 fread function and the next fread function the read data should be the same(atleast first 1/4 part of the data read using fread(fileId,height*width,'uchar') and fread(fileID,height/2*width/2,'uchar')).I am also not getting why/how he's using 'kron' to reshape the U and V components.

10 Apr 2012 MechtEngineer

Shashi, I believe you are referring to the line
sizeFrame = 1.5 * width * height;
occuring in the file loadFileYuv.m.

The author is preparing enough memory to be able to load one whole YUV (or YCbCr) 4:2:0 frame. This type of video encoding is called "Chroma Subsampling". 4:2:0 means that all luminance values of the scene are recorded, but Cb and Cr are each subsampled at a factor of 2 both horizontally and vertically. This means the total amount of data required to store each frame is:
Total = luminance + Cb + Cr
Total = full resolution + 1/4 res + 1/4 res
Total = 1.5 * full resolution

For more information, see Wikipedia's article on Chroma Subsampling:
http://en.wikipedia.org/wiki/Chroma_subsampling

Chroma subsampling is also discussed at 24:21 minutes through A Digital Media Primer for Geeks at:
http://xiph.org/video/

10 Apr 2012 Shashi barot

why is the size of one frame equals 1.5*height*width ?

05 Feb 2012 MechtEngineer

elena, I just use the File>import function in MATLAB. This can also generate the code for you to use to import a particular file in the future.

20 Jan 2012 elena

I have matlab 7.0.1 and unfortunately i can't find functions for yuv, e.g i want to load yuv file into matlab and i cannot find the appropriate function, help? thank you

19 Oct 2011 MechtEngineer

"idxFrame" can be entered as a vector containing the frame numbers you desire to be extracted from the yuv movie.

e.g. idxFrame = 200:250; would extract frames 200 to 250 from the yuv file.

19 Oct 2011 MechtEngineer

"idxFrame" is the frame number within the YUV 4:2:0 video you want extracted to an RGB image. Thus, each time you run the function loadFileYuv, it will open the YUV file, extract the specified frame from the video file in the fileName string, and close the YUV file.

For sample YUV 4:2:0 files, use the Video Trace Library at http://trace.eas.asu.edu/yuv/index.html

A versatile and extremely reliable YUV player is located here: http://www.yuvplayer.com/index.html
It is now freeware, as evidenced by here: http://www.yuvplayer.com/register.html

19 Aug 2011 MechtEngineer

Currently the program lacks an example of how to use the code.

e.g. in the file, loadFileYuv.m, the function call is:
function [mov,imgRgb] = loadFileYuv(fileName, width, height, idxFrame)
What is idxFrame? I thought it might be frames per second, but the code seems to indicate it is some sort of structure. Does this mean the YUV video file needs to be loaded into MATLAB as a variable before this subroutine is used?

It seems like this code may work well, but it just needs an example so most people can use it!! Any help would be appreciated.

01 Jun 2010 Naeem

hi
i need to convert yuv sequences downloaded from http://www.cipr.rpi.edu/resource/sequences/
into 4:2:0 yuv video file.
if you have any idea. please help me out.

nshayan@gmail.com

03 Mar 2009 Fraser Stirling

I need to convert a YUV file into a YUV16 file and also a RAW file. Then I need to convert back from these two variants to YUV.

Could this be altered to accomodate this?

25 Feb 2008 Jeo Jaje

It seems a good code. But I need reverse of this. I want to write a 4:2:0 YUV file from a sequence of 2D image files (matrix form). Any idea? please help.

30 Nov 2004 test test  

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