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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.

  


• How to effectively kill a frozen subprocess in Python ?

  2 janvier 2014, par Konos5

  I am dealing with a rather odd issue.

  I've written a Python wrapper (in Python 2.6.6) for a year old version of ffmpeg. The problem is that given a very particular video, ffmpeg stops working normally (clunky output, full cpu usage, no end stage etc) and takes the python interpreter down with it.

  Now, if I run ffmpeg with my encoding options directly from a terminal and the problematic video as input, ffmpeg won't immediately respond to Ctrl-c. I'll have to wait for a hefty of 10 seconds or more before it exits and gives me back the prompt. However if I use a 'healthy' video instead, it will simply print Received signal 2: terminating. and gracefully exit.

  In the python wrapper I use p.kill() to no effect. The behavior is exactly the same a.k.a I have to wait 10 sec before the program exits. How can I immediately stop ffmpeg when it freezes with some problematic video ?

  Note that if I do a double Ctrl-c I get the prompt back immediately no matter what.

• Revision ea74c1d78b : usage.dox : fix encoder/decoder subpage list indent use \li to separate the list

  14 mars 2015, par James Zern

  Changed Paths :
   Modify /usage.dox

  
   Modify /usage_cx.dox

  
  
  usage.dox : fix encoder/decoder subpage list indent

  use \li to separate the list items contained in conditionals. this
  avoids the encode page becoming a sub-item of decode ; likely a problem
  in <1.8.3.
  + fix encoder conditional, spelling error
  + correct encode page name to match decode ’Encoding’

  Change-Id : I67890f52bed8e708bad63fb8819a074e0beff2ca