AVI Writer OpenCV access violation

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C++

CvVideoWriter *writeravi = cvCreateVideoWriter("C:\\outavi.avi",CV_FOURCC('D','I','V','X'),fps,cvSize(frameW,frameH),isColor);

for(int stepframe=0;stepframe<numFrames;stepframe++)
{
	cvGrabFrame(captureavi);          
	imgavi=cvRetrieveFrame(captureavi);
	int t= cvWriteFrame(writeravi,imgavi);  
	cvShowImage("image",imgavi);
	cvWaitKey(20);
}

It gives me aceess violation,(even writeravi=0x003ecd18 )

if i put "0" or "-1" instead of CV_FOURCC('D','I','V','X') it works but ) stands for uncompress output & -1 gives dialg box to select compression type , from which Intel indeo video 4.5 works for me.

But in my applicationh i cant use ) or -1 7 i want compresss output.

[edit]SHOUTING removed, Code block added, "Treat my content as plain text..." option disabled - OriginalGriff[/edit]

Posted 25-Jan-12 1:05am

pranav_30

Updated 25-Jan-12 1:48am

CPallini

v3

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OriginalGriff 25-Jan-12 7:09am

DON'T SHOUT. Using all capitals is considered shouting on the internet, and rude (using all lower case is considered childish). Use proper capitalisation if you want to be taken seriously.

pranav_30 25-Jan-12 7:11am

ohhh i m realy sorry i dont know this thing...........

CPallini 25-Jan-12 8:10am

Could you please elaborate? What function call produced such an error?

pranav_30 25-Jan-12 8:45am

cvWriteFrame (writeravi,imgavi);

gives acess violatn while readng loctn ...
eror

1 solution

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E.F. Nijboer · Answer 1 · 2012-01-25T04:54:00

Solution 1

You specify DIVX in your code which doesn't work. When you get a dialog you select Intel indeo video which isn't DIVX. I think DIVX isn't installed and therefore won't work. Have a look at the link to check out the FOURCC codec list and change the codec or you could install DIVX and have another try.

http://www.fourcc.org/codecs.php[^]

Good luck!

Posted 25-Jan-12 4:54am

E.F. Nijboer

Comments

pranav_30 25-Jan-12 10:58am

i have instal klite kodek pack so i dnt thnk k its kodek issue..

E.F. Nijboer 26-Jan-12 7:44am

Have another look at the k lite codec pack. It has support for xvid but divx isn't mentioned. http://www.free-codecs.com/download/k_lite_codec_pack.htm

pranav_30 25-Jan-12 23:07pm

is there any other api for multiple camera capture. i try to learn directshow.. but could not able to understand the procedure of direct show.

pranav_30 26-Jan-12 9:15am

ok supose i have only klite codek..
Then which fourfcc should i use..
Bcoz i tried with all documented fcc of open cv
Bt prblm nt solved..