javacv FFmpeg video compression

package com.nmcc.demo.utils;
 
import lombok.extern.slf4j.Slf4j;
import org.bytedeco.javacpp.avcodec;
import org.bytedeco.javacpp.avutil;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.FFmpegFrameRecorder;
import org.bytedeco.javacv.Frame;
 
import java.io.File;
 
/**
 * @author 
 * @date 2020/2/17
 * <p>
 * Description:
 */
@Slf4j
public class ConvertVideo {
 
    private static final int FRAME_RATE = 30;
    Private  static  Final  int VIDEO_BITRATE = 1048576 ;
     Private  static  Final  int COMPRESS_WIDTH = 320. ; 
 
 
    / ** 
 * length relationship found video compression and video using 
 * video 7M after more than 56s video a 9M compressed 
 video * a 22M of 5s of compressed video 624k 
 * @param File 
 * @param checkCompress 
 * @return 
 * / 
    public  static String Convert (File File, Boolean checkCompress) { 
 
        FFmpegFrameGrabber framegrabber = new new FFmpegFrameGrabber (file.getAbsolutePath ()); 
        String fileName = null;
 
        Frame captured_frame = null;
 
        FFmpegFrameRecorder recorder = null;
 
        try {
            frameGrabber.start();
            fileName = file.getAbsolutePath().replace(".mp4", "_edited.mp4");
            log.info("wight:{},height:{}",frameGrabber.getImageWidth(), frameGrabber.getImageHeight());
 
            int height = frameGrabber.getImageHeight();
            int widht = frameGrabber.getImageWidth();
            if(checkCompress && needCompress(file.length())){
                height = calculateHeight(frameGrabber.getImageWidth(), frameGrabber.getImageHeight(), COMPRESS_WIDTH);
                widht = COMPRESS_WIDTH;
                log.info("new wight:{},height:{}",widht, height);
            }
            recorder = new FFmpegFrameRecorder(fileName, widht, height, frameGrabber.getAudioChannels());
            recorder.setFrameRate(FRAME_RATE);
            //下面这行打开就报错
            //recorder.setSampleFormat(frameGrabber.getSampleFormat());
            recorder.setSampleRate(frameGrabber.getSampleRate());
            //recorder.setAudioChannels(1);
            recorder.setVideoOption("preset", "veryfast");
            // yuv420p,像素
            recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);
            recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
            recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);
            recorder.setFormat("mp4");
            //比特
            //recorder.setVideoBitrate(VIDEO_BITRATE);
            recorder.start();
 
            while (true) {
                try {
                    captured_frame = frameGrabber.grabFrame();
                    if (captured_frame == null) {
                        System.out.println("!!! end cvQueryFrame");
                        break;
                    }
                    recorder.setTimestamp(frameGrabber.getTimestamp());
                    recorder.record(captured_frame);
                    } catch (Exception e) {
                }
            }
            recorder.stop();
            recorder.release();
            frameGrabber.stop();
        } catch (Exception e) {
            e.printStackTrace();
        }
        //File.delete (); 
        return fileName; 
    } 
 
    / ** 
     * need for compression, greater than 3MB 
     * @param length 
     * @return 
     * / 
    public  static  Boolean needCompress ( Long length) { 
        log.info ( "Video size: {}" , length);
         return length> = 3145728 ; 
    } 
 
    / ** 
     * calculate new geometric height 
     * @param W 
     * @param H 
     * @param NW 
     * @return 
     * / 
    Private  static int calculateHeight ( int W, int H, int NW) {
         Double S = Integer.valueOf (H) .doubleValue () / Integer.valueOf (W) .doubleValue ();
         int height = ( int ) (NW * S);
         // If the width and height is not even recorder.start (); being given 
        IF (height = 2% 0! ) { 
            height + =. 1 ; 
        } 
        return height; 
    } 
}

 

 

Introducing compressed video dependent java

<!--start视频截取相关-->
<dependency>
 <groupId>org.bytedeco</groupId>
 <artifactId>javacv</artifactId>
 <version>1.4.3</version>
 <exclusions>
 <exclusion>
 <groupId>org.bytedeco</groupId>
 <artifactId>javacpp</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>flycapture</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>libdc1394</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>libfreenect</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>libfreenect2</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>librealsense</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>videoinput</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>opencv</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>tesseract</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>leptonica</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>flandmark</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>artoolkitplus</artifactId>
 </exclusion>
 </exclusions>
</dependency>
<dependency>
 <groupId>org.bytedeco</groupId>
 <artifactId>javacv-platform</artifactId>
 <version>1.4.3</version>
 <exclusions>
 <exclusion>
 <groupId>org.bytedeco</groupId>
 <artifactId>javacv</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>flycapture-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>libdc1394-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>libfreenect-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>libfreenect2-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>librealsense-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>videoinput-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>opencv-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>tesseract-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>leptonica-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>flandmark-platform</artifactId>
 </exclusion>
 <exclusion>
 <groupId>org.bytedeco.javacpp-presets</groupId>
 <artifactId>artoolkitplus-platform</artifactId>
 </exclusion>
 </exclusions>
</dependency>

<! - video capture relevant end ->