手机转码工具（免费转视频格式的软件）

问题：原视频的编码格式为h265，在小程序上面无法播放，需要转为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);
            }
        }
    }
}

3、调用工具类方法

videoconvertutil convertutil = new videoconvertutil();
convertutil.convert(url, videosavepath);

路漫漫其修远兮，吾将上下而求索

译文：在追寻真理方面，前方的道路还很漫长，但我将百折不挠，不遗余力地去追求和探索。