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To process a video sequence you need access to individual frames. In JavaCV frames are accessed using a FrameGrabber. There are several concrete frame grabber classes for dealing with different devices and video files. Examples here read video sequences from files using FFmpegFrameGrabber.
General pattern for processing a video sequence, here from a video file:
import org.bytedeco.javacv.FFmpegFrameGrabber
import scala.collection.Iterator.continually
val grabber = new FFmpegFrameGrabber("my_video.avi")
grabber.start()
// Read frame by frame till the end of the video file (indicated by `null` frame)
for (frame <- continually(grabber.grab()).takeWhile(_ != null)) {
// Do some processing
}
// Close the video file
grabber.release()
Similarly in Java:
FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("my_video.avi");
// Open video video file
grabber.start();
// Read frame by frame till the end of the video file (indicated by `null` frame)
Frame frame;
while ((frame = grabber.grab()) != null) {
// Do some processing
}
// Close the video file
grabber.release();| <Previous: Chapter 10 | Chapter 11: Processing Video Sequences | Next: Chapter 15> |