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It is believed that many inexperienced people don't know what to do about how to decode the pictures in the video stream of H264 format by Java. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Introduce dependency

Org.bytedeco javacv 1.4.3 org.bytedeco.javacpp-presets ffmpeg-platform 4.0.2-1.4.3

It should be noted that there is a corresponding relationship between the versions of the two packages, which may cause problems if the versions do not correspond to each other.

Decoding process

A simple function to implement is:

Get the video input stream from Socket (H264 format) get the frames in the video stream and convert each frame to BufferedImage

Package com.amwalle.walle.raspi.camera;import org.bytedeco.javacv.FFmpegFrameGrabber;import org.bytedeco.javacv.Frame;import org.bytedeco.javacv.Java2DFrameConverter;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.InputStream;import java.net.Socket;public class CameraHandler implements Runnable {private static final Logger logger = LoggerFactory.getLogger (CameraHandler.class); private final String LOCK = "LOCK"; private Socket cameraSocket; private static BufferedImage bufferedImage CameraHandler (Socket socket) throws IOException {this.cameraSocket = socket;} String getLock () {return LOCK;} @ Override public void run () {try {InputStream cameraStream = cameraSocket.getInputStream (); FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber (cameraStream); frameGrabber.setFrameRate (30); frameGrabber.setFormat ("h364"); frameGrabber.setVideoBitrate (15); frameGrabber.setVideoOption ("preset", "ultrafast"); frameGrabber.setNumBuffers (25000000); frameGrabber.start (); Frame frame = frameGrabber.grab (); Java2DFrameConverter converter = new Java2DFrameConverter () While (frame! = null) {BufferedImage bufferedImage = converter.convert (frame); setBufferedImage (bufferedImage); synchronized (LOCK) {LOCK.notifyAll ();} frame = frameGrabber.grab ();}} catch (IOException e) {logger.info ("Video handle error, exit..."); logger.info (e.getMessage ());} private void setBufferedImage (BufferedImage image) {bufferedImage = image;} BufferedImage getBufferedImage () {return bufferedImage;}}

After reading the above, have you mastered how Java decodes the pictures in the H264 format video stream? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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