转自：https://idig8.com/2018/09/16/xiaochengxujavashizhanxiaochengxushipinfengmianchuli47/

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
    
      command = new java.util.ArrayList
     
      ();        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。