如何優雅的用java實現視頻轉碼

1. 開源項目 JAVE (Java Audio Video Encoder)
2. 引入依賴

<dependency>
    <groupId>ws.schild</groupId>
    <artifactId>jave-all-deps</artifactId>
    <version>2.7.2</version>
</dependency>

3. 編碼測試

package test;

import java.io.File;
import ws.schild.jave.AudioAttributes;
import ws.schild.jave.AudioInfo;
import ws.schild.jave.Encoder;
import ws.schild.jave.EncodingAttributes;
import ws.schild.jave.MultimediaInfo;
import ws.schild.jave.MultimediaObject;
import ws.schild.jave.VideoAttributes;
import ws.schild.jave.VideoInfo;
import ws.schild.jave.VideoSize;

public class Test {
    
    public static void main(String[] args) throws Exception {
        
        File source = new File("d:/source.mp4");
        File target = new File("d:/target.mp4");
        
        System.out.println("源視頻信息");
        MultimediaObject object = new MultimediaObject(source);
        MultimediaInfo info = object.getInfo();
        System.out.println("格式format：" + info.getFormat());
        System.out.println("時長duration：" + info.getDuration());
        VideoInfo videoInfo = info.getVideo();
        System.out.println("編碼decoder：" + videoInfo.getDecoder());
        System.out.println("碼率bitRate：" + videoInfo.getBitRate());
        System.out.println("幀率frameRate：" + videoInfo.getFrameRate());
        VideoSize videoSize = videoInfo.getSize();
        System.out.println("分辨率：" + videoSize.getWidth() + " x " + videoSize.getHeight());
        AudioInfo audioInfo = info.getAudio();
        System.out.println("編碼decoder：" + audioInfo.getDecoder());
        System.out.println("碼率bitRate：" + audioInfo.getBitRate());
        System.out.println("聲道channels：" + audioInfo.getChannels());
        System.out.println("采樣率samplingRate：" + audioInfo.getSamplingRate());
        
        // 視頻屬性
        VideoAttributes video = new VideoAttributes();
        video.setCodec("libx264");
        video.setBitRate(256000); // 碼率：256kbps
        video.setFrameRate(25); // 幀率：25fps
        int width = 640; // 固定寬度
        int height = width * videoSize.getHeight() / videoSize.getWidth();
        height = height%2==0 ? height : height+1; // 視頻寬高必須是偶數
        video.setSize(new VideoSize(width, height));
        // 音頻屬性
        AudioAttributes audio = new AudioAttributes();
        audio.setCodec("aac");
        audio.setBitRate(64000); // 碼率：64kbps
        audio.setSamplingRate(24000); // 采樣率：24kHz
        // 轉碼屬性
        EncodingAttributes attributes = new EncodingAttributes();
        attributes.setVideoAttributes(video);
        attributes.setAudioAttributes(audio);
        attributes.setFormat("mp4");

        Encoder encoder = new Encoder();
        encoder.encode(object, target, attributes);
        
        System.out.println("轉碼完成：新分辨率：" + width + " x " + height);
    }
    
}

3. 測試結果

源視頻信息
格式format：mov
時長duration：268280
編碼decoder：h264 (Main) (avc1 / 0x31637661)
碼率bitRate：500000
幀率frameRate：25.0
分辨率：768 x 432
編碼decoder：aac (LC) (mp4a / 0x6134706D)
碼率bitRate：96000
聲道channels：2
采樣率samplingRate：44100

轉碼完成：新分辨率：640 x 360