node制作一个视频帧长图生成器操作分享

const { getVideoDurationInSeconds } = require('get-video-duration');

getVideoDurationInSeconds(videoPath);

const changTimeFormat = (seconds)=>{
    seconds = parseInt(seconds);
    let h = Math.floor(seconds / 3600);
    h = h > 9 ? h : '0' + h;
    seconds %= 3600;
    let m = Math.floor(seconds / 60);
    m = m > 9 ? m : '0' + m;
    seconds %= 60;
    seconds = seconds > 9 ? seconds : '0' + seconds;
    return h + ':' + m + ':' + seconds;
};
const countSplitPoint = (duration,cutNums = 30) => {
    cutNums = Math.min(cutNums,parseInt(duration));
    const step = Math.floor(duration / cutNums);
    let start = 0;
    const res = [];
    while(cutNums--){
        res.push(changTimeFormat(start));
        start += step;
    }
    return res;
};

const cp = require('child_process');
const ffmpeg = require('ffmpeg');

const execJpg = async(videoPath , saveFilePath, timeArr, index, cb )=>{
    let ind = (index + 1) + '';
    while(ind.length < (timeArr.length + '').length){
        ind = '0' + ind;
    }
    const str = `ffmpeg -ss ${timeArr[index]} -i ${videoPath} -y -f image2 -t 0.001 ${saveFilePath + '\\' + ind}.jpg`;
    await cp.exec(str,async(err)=>{
        if(err) console.log(err);
        const progressBar = new ProgressBar({
            duration: timeArr.length - 1,
            tip:{
                0:'图片截取中……',
                100:'图片截取完成！'
            }
        });
        progressBar.run(index);
        if(index < timeArr.length - 1){
            await execJpg(videoPath , saveFilePath, timeArr, index + 1, cb )
        }else{
            console.log('开始合并图片')
            cb();
        }
    })
};
const getVideoFrame = (config,cb)=>{
    getVideoDurationInSeconds(config.videoPath).then(async(res)=>{
        const timeArr = countSplitPoint(res,config.cutNums);
        await execJpg(config.videoPath , config.saveFilePath, timeArr, 0, cb );
    });
};

let jInquirer = new JInquirer(config);
jInquirer.prompt().then(async(res)=>{
    res.saveFilePath = '.\\img';
    const ImgConcatClass = new ImgConcat();
    getVideoFrame(res,()=>{
        const p = {
            folderPath:'.\\img',        //资源目录
            targetFolder:'.\\longImg',  //合并后图片存放目录
            direction:'y'               //拼接方向，y为横向，n为纵向
        }
        ImgConcatClass.concatAll(p).then(ans=>{
            console.log(ans);
            return ans;
        });
    });
});