一、使用java ffmpeg相关包转码

转： Java 视频转码(转为MPEG-4格式)

 1、引入相关依赖

<dependency>
	<groupId>org.bytedeco</groupId>
	<artifactId>javacv</artifactId>
	<version>1.4.1</version>
</dependency>

<dependency>
	<groupId>org.bytedeco</groupId>
	<artifactId>javacpp</artifactId>
	<version>1.4.1</version>
</dependency>

<dependency>
	<groupId>org.bytedeco.javacpp-presets</groupId>
	<artifactId>opencv-platform</artifactId>
	<version>3.4.1-1.4.1</version>
</dependency>

<dependency>
	<groupId>org.bytedeco.javacpp-presets</groupId>
	<artifactId>ffmpeg-platform</artifactId>
	<version>3.4.2-1.4.1</version>
</dependency>

2、视频转码工具类

import org.bytedeco.javacv.Frame;
import org.bytedeco.javacpp.avcodec;
import org.bytedeco.javacv.FrameGrabber;
import org.bytedeco.javacv.FrameRecorder;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.FFmpegFrameRecorder;

/**
 * 视频转码工具类
 */
public class VideoConvertUtil {
	
    public void convert(String inputFile, String outputFile) throws Exception {
        FFmpegFrameGrabber grabber = FFmpegFrameGrabber.createDefault(inputFile);
        Frame captured_frame;
        FFmpegFrameRecorder recorder = null;

        try {
            grabber.start();

            recorder = new FFmpegFrameRecorder(outputFile, grabber.getImageWidth(), grabber.getImageHeight(), grabber.getAudioChannels());
            recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4);
            recorder.setFormat("mp4");
            recorder.setFrameRate(grabber.getFrameRate());
			recorder.setSampleRate(grabber.getSampleRate());
			recorder.setVideoBitrate(grabber.getVideoBitrate());
			recorder.setAspectRatio(grabber.getAspectRatio());
			recorder.setAudioBitrate(grabber.getAudioBitrate());
			recorder.setAudioOptions(grabber.getAudioOptions());
            recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);
            recorder.start();

            while (true) {
                captured_frame = grabber.grabFrame();
                if (captured_frame == null) {
                    System.out.println("转码完成");
                    break;
                }
                recorder.record(captured_frame);
            }

        } catch (FrameRecorder.Exception e) {
            e.printStackTrace();
        } finally {
            if (recorder != null) {
                try {
                    recorder.close();
                } catch (Exception e) {
                    System.out.println("recorder.close异常" + e);
                }
            }

            try {
                grabber.close();
            } catch (FrameGrabber.Exception e) {
                System.out.println("frameGrabber.close异常" + e);
            }
        }
    }
}

二、使用ffmpeg工具转码

参考：java+ffmpeg实现mp4转m3u8切片(ts)

前提是要安装FFmpeg，如果不安装需要把ffmpeg执行文件放在包里指定执行文件的路径

在实际开发中，可以通过java调用cmd命令，使用ffmpeg进行切片操作

ffmpeg -i D:/m3u8/demo.mp4 -c:v copy -c:a copy -f ssegment -segment_format mpegts -segment_list D:/m3u8/hls/test.m3u8 -segment_time 10 D:/m3u8/hls/test%05d.ts

ffmpeg -i /a/1.avi -c:v libx264 -c:a aac -strict -2 -f hls -hls_list_size 0 -hls_time 10 /a/b/1.m3u8

  private static boolean process(List<String> command) throws FFmpegException {
        String sys = System.getProperties().getProperty("os.name").toLowerCase();
        if(sys .startsWith("win")) {
            return processWin(command);
        }
        return processLinux(command);
    }

    private static boolean processWin(List<String> command) throws FFmpegException {
        if (null == command || command.size() == 0) {
            return false;
        }
        try {
            Process videoProcess = new ProcessBuilder(command).redirectErrorStream(true).start();

            new PrintStream(videoProcess.getErrorStream()).start();

            new PrintStream(videoProcess.getInputStream()).start();

            int exitcode = videoProcess.waitFor();

            return exitcode != 1;
        } catch (Exception e) {

        }
    }

    private static boolean processLinux(List<String> command)  throws FFmpegException{
        if (null == command || command.size() == 0) {
            return false;
        }
        StringBuffer cmd = new StringBuffer();
        for (int i = 0; i < command.size(); i++) {
            cmd.append(command.get(i) + " ");
        }
        try {
            Runtime rt = Runtime.getRuntime();
            Process proc = rt.exec(cmd.toString());
            InputStream stderr = proc.getErrorStream();
            InputStreamReader isr = new InputStreamReader(stderr);
            BufferedReader br = new BufferedReader(isr);
            String line;
            StringBuilder sb = new StringBuilder();
            while ((line = br.readLine()) != null) {
                sb.append(line + "\n");
            }
            log.info(sb.toString());
        } catch (Exception e) {
            log.error("执行:" + cmd + "出错", e);
        }
        return true;
    }