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• Frozen video clips when concatenating mp4 videos using ffmpeg via nodje.js fluent-ffmpeg

  21 novembre 2023, par Rasmus Puls

  I'm trying to write a simple js application that takes all video files in a directory and the produce one single video consisting of all the clips combined one after another into one timeline.

  


  To test the application I have download for random short stock video clips from pexels :

Shown in order : clip 1, clip 2, clip 3, clip 4

  


  Each of the clips plays perfectly in vlc on windows (no broken or frozen frames)

  


  I use the following script to concat the clips :

  


    const ffmpeg = require('fluent-ffmpeg');

  ffmpeg()
    .input(concatFilePath)
    .inputOptions(['-f concat', '-safe 0'])
    .outputOptions(['-c copy', '-c:v libx264', '-b:v 5M', '-r 30', '-preset', 'slow'])
    .on('end', () => {
      console.log('Video clips concatenated successfully.');
    })
    .on('error', (err) => {
      console.error('Error concatenating video clips:', err);

      // Cleanup: Delete the output folder
      console.log('Cleaning up...');
      deleteOutputFolder(outputDir);
    })
    .save(outputPath);


  


  The contect of my concatFilePath (concat.txt) file looks like this :

  


  file src\input\d69de4a3-2b72-462c-be70-f8b8287b45e0\pexels-fred-c-19065853 (Original).mp4
file src\input\d69de4a3-2b72-462c-be70-f8b8287b45e0\pexels-imad-clicks-16270463 (2160p).mp4
file src\input\d69de4a3-2b72-462c-be70-f8b8287b45e0\pexels-peter-fowler-9683061 (2160p).mp4
file src\input\d69de4a3-2b72-462c-be70-f8b8287b45e0\pexels-sascha-5799767 (1080p).mp4


  


  The problem

  


  When I run the program it takes about 15 seconds to render the output video.
The first clip looks as the stock clip, but when I get to the 2nd clip it just sits frozen at the first fram of that video, and only runs for 3-4 seconds despite the stock clip is 8 seconds long. It then transitions into the 3rd clip which is renderd correctly but the rest of the video is frozen on the last frame of clip 3 instead of showing clip 4.

  


  I'm assuming that my input options are to blame for the result of the output, I have tried various other input options suggested from github thread and other sources, but none of them have produces a reasonable result.

  


• FFMPEG -ss 00:22:58 -to 01:37:45 -i input.mkv -c copy output2.mp4 first 2 seconds image is frozen

  15 août 2022, par g3443tdfgdfgdfg

  i'm making clips from an .mkv file using ffmpeg. First i used

  


  ffmpeg -i input.mkv -ss 00:22:58 -to 01:37:45 -c:v copy -c:a copy output.mp4 


  


  but the first 1-2 seconds were only sound without image. Now i'm using the command

  


  ffmpeg -ss 00:22:58 -to 01:37:45  -i 2022_05_26-ABCNews.mkv -c copy output2.mp4 


  


  But even tho the first seconds now have image they still look kind of patchy and frozen, i understand that this might be due to the nature of the .mkv file itself, but i wanted to know if anyone have any command that better perform this function and allow to save those first 1-2 seconds.

  


• ffmpeg output always has frozen parts of the output mp4

  5 mai 2022, par bein

  So a little clarification i have a folder of videos that i want to combine into one. Ive looked at multiple overflows and everything i try ends up with an error. The first few videos work then on the later ones its just frozen. I can still however hear the audio. I currently have this as my video.js...

  


  import { exec } from 'child_process';
import * as fs from 'fs';

let folders = fs.readdirSync('./videos')


folders.forEach(element => {
    if(element != '.DS_Store'){
        let videos = fs.readdirSync('./videos/'+element)

        fs.writeFileSync('./videos/'+element+'/list.txt','')
        
        try {
            fs.rmSync('./videos/'+element+'/combined.mp4')
        } catch (error) {
            //console.log(error)
        }

        let list = ''
        
        videos.forEach(video => {
            if(video != 'list.txt' && video != '.DS_Store' && video != 'combined.mp4'){
                fs.appendFileSync('./videos/'+element+'/list.txt',('file '+video+'\n'))


                list += `file ${video}`
                list += "\n"




            
            }
        });

        var writeStream = fs.createWriteStream('./videos/'+element+'/list.txt')

        writeStream.write(list)

        writeStream.end()


        exec(`ffmpeg -hwaccel d3d11va -safe 0 -ss 0 -f concat -i  ${'./videos/'+element+'/list.txt'}  -c copy -copyinkf -vsync 1 -s 1920x1080 -sws_flags lanczos -c:v h264 ${'./videos/'+element+'/combined.mp4'}`, {maxBuffer: 1024 * 100000},(error, stdout, stderr) => {
            if (error) {
                console.log(`error: ${error.message}`);
                return;
            }
            else{
                console.log("videos are successfully merged")
        }
            
        })
    }
});


  


  Any Ideas ? Tried both on Mac and Windows