distorted frame with CvCaptureFile and retrieveFrame (Bug #1980)

Added by Radu Spineanu almost 13 years ago. Updated over 12 years ago.

Status:Done Start date:2012-05-23
Priority:Normal Due date:
Assignee:Vadim Pisarevsky % Done:

0%
Category:ios
Target version:2.4.2
Affected version: Operating System:
Difficulty: HW Platform:
Pull request:

Description

I'm using CvCaptureFile and retrieveFrame and it works pretty well.

However someone sent me a bug report with the video below that, while playing perfectly, returns completely distorted frames. If I don't use openCV and process the frames with CGContext the result is sent properly.

This is the mov: http://arcadia.timisoara.roedu.net/tieG8thuEe3aik2uGa3ahs1m.mov

Associated revisions

Revision 7c778fc0
Added by Vadim Pisarevsky over 12 years ago

fixed possible video distortion problem when cap_avfoundation.mm is used to capture video (ticket #1980)

Revision 10849d1c
Added by Andrey Pavlenko about 11 years ago

Merge pull request #1980 from alalek:ocl_interop_initialization

History

#1
Updated by Radu Spineanu almost 13 years ago

This is the fix for the bug. rowbytes is retrieved via CVPixelBufferGetBytesPerRow earlier.

 1--- cap_avfoundation.mm.old    2012-06-03 18:37:13.000000000 +0300
 2+++ cap_avfoundation.mm    2012-06-03 18:37:50.000000000 +0300
 3@@ -946,7 +946,7 @@
 4         image->height = height; 
 5         image->nChannels = 4; 
 6         image->depth = IPL_DEPTH_8U; 
 7-        image->widthStep = width*4; 
 8+        image->widthStep = rowBytes; 
 9         image->imageData = imagedata; 
10         image->imageSize = currSize; 
11
12@@ -959,7 +959,7 @@
13         bgr_image->height = height; 
14         bgr_image->nChannels = 3; 
15         bgr_image->depth = IPL_DEPTH_8U; 
16-        bgr_image->widthStep = width*4; 
17+        bgr_image->widthStep = rowBytes; 
18         bgr_image->imageData = bgr_imagedata; 
19         bgr_image->imageSize = currSize;

#2
Updated by Andrey Kamaev almost 13 years ago

  • Target version set to 2.4.2
  • Assignee set to Vadim Pisarevsky

#3
Updated by Vadim Pisarevsky over 12 years ago

thanks! the proposed patch was put to SVN, r8833.

  • Status changed from Open to Done

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