I want to read in an .avi video file for a program that I am making. I have the file location saved as a string. Is there any good tutorials on using .avi files in c++ or does anyone know who to read one in? Is it the same as normal files?
I have a previously asked SO question that goes into better detail but here is what I want to do:
I am making a program that will detect faces (though OpenCV) As of now I have been given a video processor program that will detect each face on a frame, and return the frame as a image and the CvRec of the faces. I want to take these faces and test them to validate that they are all actually faces.
After I have all the faces (tested) I want to then take the images and test them together. I test the faces on each frame for size and distance changes. If the faces pass this for a frame length of two seconds, then I want to crop the face and make it the subject of each frame.
After each frame is cropped I then want to save the new video file for the user.
Hopefully that helps. If anyone needs a better explanation please let me know.
It seems you are staying within OpenCV so things are easy. If OpenCV is compiled properly it is capable of delegating io/coding/decoding to other libraries. Quicktime and others for example, but best is to use ffmpeg. You open, read and decode everything using the OpenCV API which gives you the video frame by frame.
Make sure your OpenCV is compiled with ffmpeg support and then read the OpenCV tutorial on how to read/write AVI files. It’s really easy.
Getting OpenCV to be built with ffmpeg support might be hard though. You might want to switch to an older version of OpenCV if you can’t get ffmpeg running with the current one.
Personally i would not spent time trying to read the video by yourself and delegate the task to OpenCV. That’s how it is supposed to be used.