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• FFMPEG multiple screenshots command

  8 octobre 2020, par Jhony code

  iam trying to code a function which creates images from video files using ffmpeg.

  


  But now i want to know how can i make that with ffmpeg commands exactly, because i use wrapper and now i have some limitations, so i must go in the native way.

  


  So, first of all i have decided to use a Wrapper which is called node-fluent-ffmpeg.

  


  And this is my work-around with the Wrapper :

  


  ffmpeg({
        source: `The video file...`,
      })
        .on("filenames", async (filenames) => {
        })
        .on("error", function (err) {
          console.log("Error in filenames section: " + JSON.stringify(err));
        })
        .on("end", function () {
          console.log("Screenshots taken");
        })
        .screenshots({
          count: 60,
          folder: "tmp/",
          filename: "thumbnail-at-%i.png",
          size: "1600x900",
        })
        .on("end", function (stdout, stderr) {
            let newImg = await fs.createReadStream(`/tmp/${img}`);
            destparams = await {
              Bucket: dstBucket,
              Key: "uploaded-" + img,
              Body: newImg,
              ContentType: "image",
            };
           await s3.putObject(destparams).promise();


  


  }) ;

  


  Notes for understanding me better :

  


  


  • I still want to make it in node.js

    


  


  • Let's assume the file is : "The video file..."

    


  


  • I am taking 60 screenshots from the video in a random way, like it
does not matter the length of the video it will just take 60 screenshots from start until the end of the video.

    


  


  • Every screenshot taken will have a prefixed and ordered number and name for every frame.
For example : thumbnail-at-1.png, thumbnail-at-2.png, thumbnail-at-3.png and it continues until it reaches the 60 screenshot limit.

    


  


  • Every screenshot will be saved with a 1600x900 resolution.

    


  


  • Every screenshot will be saved in the TMP folder.

    


  


  • Do not mind reading this : After all I'll upload every screenshot to a s3 bucket.

    


  


  • I had search trough a lot of old forums, but it seems that ffmpeg has
a poor documentation (I have been stuck, so hard to understand).

    


  


  


  So my main goal is :

  


  How i can make exactly that function that i have shown in the code sample and the quick notes, with the FFMPEG commands ? (Not with the wrapper)

  


  (Sorry that i'm trying to make it simpler)

  


  I mean, Which commands i must use, with the FFMPEG commands in the following code sample ?

  


  By the way : it is node.js,

  


  Do not really know what to do, sorry

  


  spawnSync(
      "/opt/ffmpeg/ffmpeg",
      [
        "-i",
        ``,
        "-f",
        "",
        ``
      ],
      { stdio: "inherit" }
 );


  


  Thanks for your patience !

  


  Enviroment :

  


  

  • Node.js 12.x

  


  • FFMPEG (4.3.1)

  


  


• Boosting the video transcoding time with fluent-FFMPEG in cloud functions

  6 juillet 2022, par Jaisurya Narayanan

  I am trying to convert a webm video to mp4 format recorded using MediaRecorder API.I am using fluent-ffmpeg. Once the file has been uploaded to storage as webm , we will trigger a cloud function that will do the video transcoding. To provide source stream for ffmpeg, am passing the google bucket url as a source url.
The conversion works fine, but the problem that conversion time is very slower that it is taking 10 mins or more for longer(20-30 mins) and hd quality videos.

  


  Due to this the cloud function max time out gets reached . Am using 2nd generation cloud functions ,i know that we can increase the max time out time upto 1 hour , but i feel it is not optimised way of handling this.Any help regarding the above issue on how to optimise conversion time would be highly appreciated.

  


  I will attach the code that does the transcoding

  


  


  


  import FfmpegCommand from 'fluent-ffmpeg';
import {  path } from '@ffmpeg-installer/ffmpeg';
FfmpegCommand.setFfmpegPath(path);

function transcodeToMp4(sourceUrl,gcsDestFile){
return new Promise((resolve, reject) => {
        FfmpegCommand({source : sourceUrl}) // sourceUrl will be google bucket url
            .outputOptions('-c:v copy')
            .outputOptions('-b:a 1300k')
            .outputOptions('-f mp4')
            .outputOptions('-preset ultrafast')
            .outputOptions('-movflags frag_keyframe+empty_moov')
            .pipe(gcsFile.createWriteStream(),{end: true})
            .on('finish',()=>{
             resolve(success);
             })
            .on('error',(err)=>{
             reject(err);
             });
});

}

  


  


  



  Thanks in Advance..

  


• Video Concat using ffmpeg [closed]

  17 juin 2022, par Milan K Jain

  ffmpeg -i url1 -i url2 -i url3 -i url4 -filter_complex "[0:v:0]scale=1920:1080[c1] ; [1:v:0]scale=1920:1080[c2] ; [2:v:0]scale=1920:1080[c3] ; [3:v:0]scale=1920:1080[c4], [c1] [0:a:0] [c2] [1:a:0] [c3] [2:a:0] [c4] [3:a:0] concat=n=4:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" /Users/myname/Downloads/f1-2017-07-12.mp4 -y

  


  In Place of url I want to give link U get from after storing my video in amazon s3 bucket
Someone pls help