「小程序JAVA实战」小程序视频封面处理（47）

截图这块，在微信小程序 工具 上，上传视频是有返回截图的，但是万万没想到在手机端是不能用的。所以还得借助ffmpge工具来完成，方式很简单。源码：https://github.com/limingios/wxProgram.git 中wx-springboot 和 No.15

例子

注意建议使用jpg的格式，png的格式比较大

ffmpeg -y -i a.mp4 -ss 00:00:01  -vframes 1 new.jpg

java代码工具类编写

spring boot common中加入FetchVideoCover

package com.idig8.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;

/**
 * 
 * @Description: 获取视频的信息
 */
public class FetchVideoCover {
    // 视频路径
    private String ffmpegEXE;

    public void getCover(String videoInputPath, String coverOutputPath) throws IOException, InterruptedException {
//      ffmpeg.exe -ss 00:00:01 -i spring.mp4 -vframes 1 bb.jpg
        List<String> command = new java.util.ArrayList<String>();
        command.add(ffmpegEXE);

        // 指定截取第1秒
        command.add("-ss");
        command.add("00:00:01");

        command.add("-y");
        command.add("-i");
        command.add(videoInputPath);

        command.add("-vframes");
        command.add("1");

        command.add(coverOutputPath);

        for (String c : command) {
            System.out.print(c + " ");
        }

        ProcessBuilder builder = new ProcessBuilder(command);
        Process process = builder.start();

        InputStream errorStream = process.getErrorStream();
        InputStreamReader inputStreamReader = new InputStreamReader(errorStream);
        BufferedReader br = new BufferedReader(inputStreamReader);

        String line = "";
        while ( (line = br.readLine()) != null ) {
        }

        if (br != null) {
            br.close();
        }
        if (inputStreamReader != null) {
            inputStreamReader.close();
        }
        if (errorStream != null) {
            errorStream.close();
        }
    }

    public String getFfmpegEXE() {
        return ffmpegEXE;
    }

    public void setFfmpegEXE(String ffmpegEXE) {
        this.ffmpegEXE = ffmpegEXE;
    }

    public FetchVideoCover() {
        super();
    }

    public FetchVideoCover(String ffmpegEXE) {
        this.ffmpegEXE = ffmpegEXE;
    }

    public static void main(String[] args) {
        // 获取视频信息。
        FetchVideoCover videoInfo = new FetchVideoCover("c:\\ffmpeg\\bin\\ffmpeg.exe");
        try {
            videoInfo.getCover("c:\\北京北京.avi","c:\\北京.jpg");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

功能实现

视频转化完毕后，完成视频截图的转化，并保存在数据库中

package com.idig8.controller;

import java.io.File;
import java.util.Date;
import java.util.UUID;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import com.idig8.pojo.Bgm;
import com.idig8.pojo.Videos;
import com.idig8.service.BgmService;
import com.idig8.service.VideoService;
import com.idig8.utils.FetchVideoCover;
import com.idig8.utils.JSONResult;
import com.idig8.utils.MergeVideoMp3;
import com.idig8.utils.enums.VideoStatusEnum;
import com.idig8.utils.file.FileUtil;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;


@RestController
@Api(value="视频相关业务的接口", tags= {"视频相关业务的controller"})
@RequestMapping("/video")
public class VideoController extends BasicController {

    @Autowired
    private BgmService bgmService;

    @Autowired
    private VideoService videosService;

    @Value("${server.file.path}")
    private String fileSpace;

    @Value("${server.ffmpeg.path}")
    private String ffmpegexe;


    @ApiOperation(value="上传视频", notes="上传视频的接口")
    @ApiImplicitParams({
        @ApiImplicitParam(name="userId", value="用户id", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="bgmId", value="背景音乐id", required=false, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="videoSeconds", value="背景音乐播放长度", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="videoWidth", value="视频宽度", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="videoHeight", value="视频高度", required=true, 
                dataType="String", paramType="form"),
        @ApiImplicitParam(name="desc", value="视频描述", required=false, 
                dataType="String", paramType="form")
    })
    @PostMapping(value="/upload", headers="content-type=multipart/form-data")
    public JSONResult upload(String userId, 
                String bgmId, double videoSeconds, 
                int videoWidth, int videoHeight,
                String desc,
                @ApiParam(value="短视频", required=true)
                MultipartFile file) throws Exception {

        if (StringUtils.isBlank(userId)) {
            return JSONResult.errorMsg("用户id不能为空...");
        }
        // 文件保存的命名空间
        String fileName = file.getOriginalFilename();
        // 保存到数据库中的相对路径
        String path = "";
        String videOutPath = "";
        String ImagePath = "";
        try {
             path = FileUtil.uploadFile(file.getBytes(), fileSpace, fileName);
            } catch (Exception e) {
                e.getStackTrace();
                   return JSONResult.errorMsg(e.getMessage());
            }                


        if(StringUtils.isNotBlank(bgmId)){
            Bgm bgm = bgmService.queryBgmById(bgmId);
            String mp3BgmPath = fileSpace + bgm.getPath();
            MergeVideoMp3 mergeVideoMp3 = new MergeVideoMp3(ffmpegexe);
            String videOutPathName = UUID.randomUUID().toString()+".mp4";
            File targetFile = new File(fileSpace + userId);
            if (!targetFile.exists()) {
                targetFile.mkdirs();
            }
            videOutPath = "/"+userId+"/"+videOutPathName;
            String videoInput = fileSpace +path;
            mergeVideoMp3.convertor(videoInput, mp3BgmPath, videoSeconds, fileSpace +videOutPath);

        }else{
            videOutPath = path;

        }

        ImagePath =  "/"+userId+"/"+UUID.randomUUID().toString()+".jpg";;
        FetchVideoCover fetchVideoCover = new FetchVideoCover(ffmpegexe);
        fetchVideoCover.getCover(fileSpace +videOutPath, fileSpace +ImagePath);


        Videos videos = new Videos();
        videos.setAudioId(bgmId);
        videos.setCreateTime(new Date());
        videos.setVideoDesc(desc);
        videos.setId(UUID.randomUUID().toString());
        videos.setUserId(userId);
        videos.setVideoHeight(videoHeight);
        videos.setVideoWidth(videoWidth);
        videos.setVideoPath(videOutPath);
        videos.setCoverPath(ImagePath);
        videos.setStatus(VideoStatusEnum.SUCCESS.value);
        videosService.saveVideo(videos);

        return JSONResult.ok(path);

    }
}

小程序中的chooseBgm.js 增加友好提示

const app = getApp()

Page({
    data: {
      poster: 'http://y.gtimg.cn/music/photo_new/T002R300x300M000003rsKF44GyaSk.jpg?max_age=2592000',
      name: '此时此刻',
      author: '许巍',
      src: 'http://ws.stream.qqmusic.qq.com/M500001VfvsJ21xFqb.mp3?guid=ffffffff82def4af4b12b3cd9337d5e7&uin=346897220&vkey=6292F51E1E384E06DCBDC9AB7C49FD713D632D313AC4858BACB8DDD29067D3C601481D36E62053BF8DFEAF74C0A5CCFADD6471160CAF3E6A&fromtag=46',
      serverUrl:"",
      videoParams:{}
    },
    onLoad:function(params){
      var me = this;
      console.log(params);

      me.setData({
        videoParams:params
      })

      wx.showLoading({
        title: '请等待...',
      });
      var serverUrl = app.serverUrl;
      // 调用后端
      wx.request({
        url: serverUrl + '/bgm/list',
        method: "POST",
        header: {
          'content-type': 'application/json', // 默认值
        },
        success: function (res) {
          console.log(res.data);
          wx.hideLoading();
          if (res.data.status == 200) {
            var bgmList = res.data.data;
            me.setData({
              bgmList: bgmList,
              serverUrl: serverUrl
            });
          } else if (res.data.status == 502) {
            wx.showToast({
              title: res.data.msg,
              duration: 2000,
              icon: "none",
              success: function () {
                wx.redirectTo({
                  url: '../userLogin/login',
                })
              }
            });
          }
        }
      })
    },
  upload:function(e){
    var me = this;
    var datasParams = me.data.videoParams;
    var bgmId = e.detail.value.bgmId;
    var desc = e.detail.value.desc;
    console.log("bgmId:"+bgmId);
    console.log("desc:" + desc);
    var tempDuration = datasParams.tempDuration;
    var tempHeight = datasParams.tempHeight;
    var tempWidth = datasParams.tempWidth;
    var tempSize = datasParams.tempSize;
    var tempFilePath = datasParams.tempFilePath;
    var thumbTempFilePath = datasParams.thumbTempFilePath;
    var userId = app.userInfo.id;


    wx.showLoading({
      title: '请等待...',
    });
    var serverUrl = app.serverUrl;
    // 调用后端
   wx.uploadFile({
     url: serverUrl + '/video/upload',
     filePath: tempFilePath,
     formData:{
       userId: userId,
       bgmId: bgmId,
       videoSeconds: tempDuration,
       videoWidth: tempWidth,
       videoHeight: tempHeight,
       desc: desc,
     },
     name: 'file',
     success:function(res){
      console.log(res);
       var status = JSON.parse(res.data).status;
       debugger;
       wx.hideLoading();
       if (status == 200) {
         wx.showToast({
           title: "上传成功~！",
           icon: 'none',
           duration: 3000
         })
       } else if (status == 500) {
         wx.showToast({
           title: res.data.msg,
           icon: 'none',
           duration: 3000
         })
       }
     }

   })
  }
})

PS：截图也是通过ffmpge的方式，小程序工具的坑很多，官网都没介绍返回截图，但是小程序工具就返回截图了，这就是个坑。

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