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以实现如下功能

• 1、支持音频文件转mp3；
• 2、支持视频文件转mp4；
• 3、支持视频提取音频；
• 4、支持视频中提取缩略图；
• 5、支持按时长拆分音频文件；

1、工具类

由于部分原因，没有将FfmpegUtil中的静态的命令行与Type枚举类结合使用。

import lombok.extern.slf4j.Slf4j;import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.TimeUnit;/***** @author xuancg* 要求系统内置ffmpeg工具环境* @date 2024/9/23*/
@Slf4j
public class FfmpegUtil {private static final String CONVERT_MP3 = "ffmpeg -i %s -y %s";private static final String CONVERT_MP4 = "ffmpeg -i %s -c:v libx264 -c:a copy -y %s";private static final String EXTRACT_MP3 = "ffmpeg -i %s -q:a 0 -map a -y %s";private static final String EXTRACT_ICON = "ffmpeg -i %s -ss 0.5 -vframes 1 -r 1 -ac 2 -ab 128k   -y -f mjpeg %s";private static final String SPLIT_AUDIO_BY_SIZE = "ffmpeg -i %s  -f segment -segment_time  %d  -c copy -y  %s";private static final Set<String> MP3_TYPE = new HashSet<>(Arrays.asList("mp3", "wav", "aac", "flac"));private static final Set<String> MP4_TYPE = new HashSet<>(Arrays.asList("mp4", "avi", "flv", "mpeg", "wmv"));/**** 音视频文件格式化，如果存在目标文件会强制覆盖* 1、支持音频文件转mp3；* 2、支持视频文件转mp4；* 3、支持视频提取音频；* 4、支持视频中提取缩略图；* 5、支持按时长拆分音频文件；*/public static boolean convertMedia(MediaConvertBo convertBo) {File src = convertBo.getSrc();File dest = convertBo.getDest();if (null == src || !src.isFile()) {log.error("原始文件不存在");return false;}if (null != dest && dest.isFile()) {log.info("目标文件已存在");}long start = System.currentTimeMillis();Process process = null;BufferedReader reader = null;try {String cmd = createCmd(convertBo);if(null == cmd){return false;}log.info("ffmpeg执行命令=" + cmd);// 执行命令process = Runtime.getRuntime().exec(cmd);// 获取命令输出结果reader = new BufferedReader(new InputStreamReader(process.getErrorStream()));String line;while ((line = reader.readLine()) != null) {log.debug(line);}// 明确自己的命令需要执行多长时间，否则可以一直等待int timeout = convertBo.getTimeout();if (timeout <= 0) {process.waitFor();} else {process.waitFor(timeout, TimeUnit.SECONDS);}return dest.isFile() && dest.length() > 10;} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {log.error("剪裁视频超时source=" + src.getAbsolutePath());} finally {if (null != process) {process.destroy();}if (null != reader) {try {reader.close();} catch (IOException e) {log.error("关闭流失败" + e.getMessage());}}log.info("耗时ms=" + (System.currentTimeMillis() - start));}return false;}public static boolean isMp4File(File file){String name = file.getName();String suffix = name.substring(name.lastIndexOf(".") + 1);return MP4_TYPE.contains(suffix);}public static boolean isMp3File(File file){String name = file.getName();String suffix = name.substring(name.lastIndexOf(".") + 1);return MP3_TYPE.contains(suffix);}private static final String createCmd(MediaConvertBo bo) {File src = bo.getSrc();String srcPath = src.getAbsolutePath().replace("\\", "/");String destPath = bo.getDest().getAbsolutePath().replace("\\", "/");;if (bo.isConvertMp3()) {if(!isMp3File(src)){log.error("错误的mp3格式");return null;}return String.format(CONVERT_MP3, srcPath, destPath);} else if (bo.isConvertMp4()) {if(!isMp4File(src)){log.error("错误的mp4格式");return null;}return String.format(CONVERT_MP4, srcPath, destPath);} else if(bo.getType() == MediaConvertBo.Type.EXTRACT_MP3){if(!isMp4File(src)){log.error("错误的mp4格式");return null;}return String.format(EXTRACT_MP3, srcPath, destPath);} else if(bo.getType() == MediaConvertBo.Type.EXTRACT_ICON) {if(!isMp4File(src)){log.error("错误的mp4格式");return null;}return String.format(EXTRACT_ICON, srcPath , destPath);} else if(bo.getType() == MediaConvertBo.Type.SPLIT_AUDIO_BY_SIZE){bo.getDest().mkdirs();String name = src.getName();String suffix = name.substring(name.lastIndexOf(".") + 1);// 保持输入输出一致性return String.format(SPLIT_AUDIO_BY_SIZE, srcPath, bo.getSplitSize(), destPath + "/output_%03d." + suffix);}log.error("错误的type");return null;}}

2、入参对象

import lombok.Data;import java.io.File;/***** @author xuancg* @date 2024/9/23*/
@Data
public class MediaConvertBo {private File src;private File dest;/**0表示持续等待，单位秒*/private int timeout = 0;/** 拆分时长，单位秒*/private int splitSize = 60;/**处理类型，必传*/private Type type;public boolean isConvertMp3(){return null != type && type == Type.CONVERT_MP3;}public boolean isConvertMp4(){return null != type && type == Type.CONVERT_MP4;}public enum Type {/**将视频转码成mp4*/CONVERT_MP4,/**将音频转码成mp3*/CONVERT_MP3,/**从视频中提取音频*/EXTRACT_MP3,/**从视频中提取缩略图*/EXTRACT_ICON,/**按时长拆分音频文件*/SPLIT_AUDIO_BY_SIZE,;}}

3、junit测试

import org.junit.Test;import java.io.File;/***** @author xuancg* @date 2024/9/23*/
public class ConvertTest {/*** 1分10秒的wav2M大小=转成mp3耗时858ms,200kb大小*/@Testpublic void convertmp3(){File src = new File("C:\\Users\\Desktop\\音视频素材\\example.wav");File dest = new File("C:\\Users\\Desktop\\音视频素材\\example.mp3");MediaConvertBo bo = new MediaConvertBo();bo.setType(MediaConvertBo.Type.CONVERT_MP3);bo.setSrc(src);bo.setDest(dest);System.out.println(FfmpegUtil.convertMedia(bo));}/*** 4分13秒视频50M大小=提取音频耗时7秒,4M大小*/@Testpublic void extractMp3(){File src = new File("C:\\User\\Desktop\\音视频素材\\202002041032546186.mp4");File dest = new File("C:\\User\\Desktop\\音视频素材\\202002041032546186.mp3");MediaConvertBo bo = new MediaConvertBo();bo.setType(MediaConvertBo.Type.EXTRACT_MP3);bo.setSrc(src);bo.setDest(dest);System.out.println(FfmpegUtil.convertMedia(bo));}/*** 耗时500ms,保持原始视频尺寸*/@Testpublic void extractIcon(){File src = new File("C:\\Users\\Desktop\\音视频素材\\202002041032546186.mp4");File dest = new File("C:\\Users\\Desktop\\音视频素材\\202002041032546186.jpg");MediaConvertBo bo = new MediaConvertBo();bo.setType(MediaConvertBo.Type.EXTRACT_ICON);bo.setSrc(src);bo.setDest(dest);System.out.println(FfmpegUtil.convertMedia(bo));}/*** 1分钟2秒*/@Testpublic void splitAudio(){File src = new File("C:\\Users\\Desktop\\音视频素材\\example.wav");File dest = new File("C:\\Users\\Desktop\\音视频素材\\example");MediaConvertBo bo = new MediaConvertBo();bo.setType(MediaConvertBo.Type.SPLIT_AUDIO_BY_SIZE);bo.setSrc(src);bo.setDest(dest);bo.setSplitSize(60);System.out.println(FfmpegUtil.convertMedia(bo));}}

5、maven依赖

<dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version> <!-- 版本号可替换为最新版本 --><scope>test</scope>
</dependency><dependency><groupId>org.bytedeco</groupId><artifactId>javacv</artifactId><version>1.5.8</version>
</dependency><!-- 此版本中主要兼容linux和windows系统，如需兼容其他系统平台，请引入对应依赖即可 -->
<dependency><groupId>org.bytedeco</groupId><artifactId>opencv</artifactId><version>4.6.0-1.5.8</version><classifier>linux-x86_64</classifier>
</dependency>
<dependency><groupId>org.bytedeco</groupId><artifactId>opencv</artifactId><version>4.6.0-1.5.8</version><classifier>windows-x86_64</classifier>
</dependency>
<dependency><groupId>org.bytedeco</groupId><artifactId>openblas</artifactId><version>0.3.21-1.5.8</version><classifier>linux-x86_64</classifier>
</dependency>
<dependency><groupId>org.bytedeco</groupId><artifactId>openblas</artifactId><version>0.3.21-1.5.8</version><classifier>windows-x86_64</classifier>
</dependency>
<dependency><groupId>org.bytedeco</groupId><artifactId>ffmpeg</artifactId><version>5.1.2-1.5.8</version><classifier>linux-x86_64</classifier>
</dependency>
<dependency><groupId>org.bytedeco</groupId><artifactId>ffmpeg</artifactId><version>5.1.2-1.5.8</version><classifier>windows-x86_64</classifier>
</dependency>