视频大文件压缩

参考文档: https://blog.csdn.net/weixin_41023230/article/details/109113449

1.压缩方法:

/**
 * 传视频File对象,返回压缩后File对象信息
 * @param source
 */
public static File compressionVideo(File source,String picName) {
    if(source == null){
        return null;
    }

    String newPath = source.getAbsolutePath().substring(0, source.getAbsolutePath().lastIndexOf(File.separator)).concat(File.separator).concat(picName);
    File target = new File(newPath);
    try {
        MultimediaObject object = new MultimediaObject(source);
        AudioInfo audioInfo = object.getInfo().getAudio();
        // 根据视频大小来判断是否需要进行压缩,
        int maxSize = 5;
        double mb = Math.ceil(source.length()/ 1048576);
        int second = (int)object.getInfo().getDuration()/1000;
        BigDecimal bd = new BigDecimal(String.format("%.4f", mb/second));
        System.out.println("开始压缩视频了--> 视频每秒平均 "+ bd +" MB ");
        // 视频 > 5MB, 或者每秒 > 0.5 MB 才做压缩, 不需要的话可以把判断去掉
        boolean temp = mb > maxSize || bd.compareTo(new BigDecimal(0.5)) > 0;

        long time = System.currentTimeMillis();

        //TODO 视频属性设置
        int maxBitRate = 128000;// 比特率
        int maxSamplingRate = 44100;// 音频采样频率
        int bitRate = 800000;// 比特率
        int maxFrameRate = 20;
        int maxWidth = 1280;

        AudioAttributes audio = new AudioAttributes();

        // 设置通用编码格式10                   audio.setCodec("aac");
        // 设置最大值:比特率越高,清晰度/音质越好
        // 设置音频比特率,单位:b (比特率越高,清晰度/音质越好,当然文件也就越大 128000 = 182kb)
        if(audioInfo.getBitRate() > maxBitRate){
            audio.setBitRate(new Integer(maxBitRate));
        }

        // 设置重新编码的音频流中使用的声道数(1 =单声道,2 = 双声道(立体声))。如果未设置任何声道值,则编码器将选择默认值 0。
        audio.setChannels(audioInfo.getChannels());

        // 采样率越高声音的还原度越好,文件越大
        // 设置音频采样率,单位:赫兹 hz
        // 设置编码时候的音量值,未设置为0,如果256,则音量值不会改变
        // audio.setVolume(256);
        if(audioInfo.getSamplingRate() > maxSamplingRate){
            audio.setSamplingRate(maxSamplingRate);
        }

        //TODO 视频编码属性配置
        ws.schild.jave.info.VideoInfo videoInfo = object.getInfo().getVideo();
        VideoAttributes video = new VideoAttributes();
        video.setCodec("h264");

        //设置音频比特率,单位:b (比特率越高,清晰度/音质越好,当然文件也就越大 800000 = 800kb)
        if(videoInfo.getBitRate() > bitRate){
            video.setBitRate(bitRate);
        }

        // 视频帧率:15 f / s  帧率越低,效果越差
        // 设置视频帧率(帧率越低,视频会出现断层,越高让人感觉越连续),视频帧率(Frame rate)是用于测量显示帧数的量度。所谓的测量单位为每秒显示帧数(Frames per Second,简:FPS)或“赫兹”(Hz)。
        if(videoInfo.getFrameRate() > maxFrameRate){
            video.setFrameRate(maxFrameRate);
        }

        // 限制视频宽高
        int width = videoInfo.getSize().getWidth();
        int height = videoInfo.getSize().getHeight();
        if(width > maxWidth){
            float rat = (float) width / maxWidth;
            video.setSize(new VideoSize(maxWidth,(int)(height/rat)));
        }

        EncodingAttributes attr = new EncodingAttributes();
        attr.setAudioAttributes(audio);
        attr.setVideoAttributes(video);

        // 设置线程数
        attr.setEncodingThreads(Runtime.getRuntime().availableProcessors()/2);

        Encoder encoder = new Encoder();
        encoder.encode(new MultimediaObject(source), target, attr);
        System.out.println("压缩总耗时:" + (System.currentTimeMillis() - time)/1000);
        return target;
    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        if(target.length() > 0){
            source.delete();
        }
    }
    return source;
}

2.测试方法

public static void main(String[] args) {
    // 压缩前文件路径
    File source = new File("C:/Users/linlo/Documents/万兴神剪手/Output/我的视频.mp4");
    // 压缩后的文件路径
    String picName = "new.mp4";
    File file = compressionVideo(source, picName);
}

3.引包

import ws.schild.jave.Encoder;
import ws.schild.jave.MultimediaObject;
import ws.schild.jave.encode.AudioAttributes;
import ws.schild.jave.encode.EncodingAttributes;
import ws.schild.jave.encode.VideoAttributes;
import ws.schild.jave.info.AudioInfo;
import ws.schild.jave.info.VideoSize;

import java.io.*;
import java.math.BigDecimal;

4.引入依赖

<dependency>
    <groupId>ws.schild</groupId>
    <artifactId>jave-core</artifactId>
    <version>3.0.0</version>
</dependency>

<dependency>
    <groupId>ws.schild</groupId>
    <artifactId>jave-nativebin-win64</artifactId>
    <version>3.0.0</version>
</dependency>

5.测试结果

 

posted @ 2021-06-18 17:08  An-Optimistic-Person  阅读(352)  评论(0编辑  收藏  举报