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• Error during use of ffmpeg for the joining of images to form a video file

  19 juin 2022, par Commoner

  I am trying to join a sequence of images (*.png) using ffmpeg. The filenames of the images are in the following format : recon_0001.png,  recon_0002.png, ... , recon_0100.png. I would like to join the images sequentially (i.e. recon_0001.png being the first frame, recon_0002.png the second frame and so on.)

  



  After looking at the following link : Python : Make a video using several .png images , I tried to implement my task using the following code :

  



  from __future__ import division
import cv2
import os
import matplotlib.pyplot as plt
from pylab import pcolor, show, colorbar, xticks, yticks
import numpy as np

if(1):
    ffmpeg -f image2 -r 1/5 -i /Users/Username/Folder/recon_%04d.png -vcodec mpeg4 -y movie.mp4


  



  But, I get the following error :

  



  ffmpeg -f image2 -r 1/5 -i /Users/Username/Folder/recon_%04d.png -vcodec mpeg4 -y movie.mp4
               ^
SyntaxError: invalid syntax


  



  What am I missing here ? I am new to the use of ffmpeg and I will really appreciate any help.

  


• Compress the video using ffmpeg when upload using php form ?

  7 mars 2018, par kunal

  I am using laravel famework and i am using ffmpeg PHP library. If have not found any good links for video compression using ffmpeg. There are two cases of compression.

  1) Video Already exists in folder - this i have done already 
  
  2) Video Upload through Form - this i am not able to do :(

  Lets i am sharing 1st case code :-

  Suppose my video is 13Mb and below code compressed to 4.5Mb (running fine)
  
  $inputVideo = public_path('input/airplane_flight_airport_panorama_1080.mp4');
  
  $outputVideo = public_path('uploads/output.mp4');
  
  exec("ffmpeg -i $inputVideo -b 1000000 $outputVideo"); // this compressing or resize the video

  Now second case is uploading using form :-

  <form method="post" action="{{url('/api/upload-test-video')}}" enctype="multipart/form-data">
  
   <input type="file" /><br />
  
   <input type="submit" value="Submit" />
  
  </form>

  Now when i go to function :-

  public function uploadTestVideo(Request $request){
  
      echo "<pre>"; print_r($_FILES); 
  
      // now in this function i wnat to compress the video 
  
  }
  
  </pre>

  Note :- I don’t want to upload video in some folder and after that get the video and compress the video. Please help how can i resolve this problem. Thanks in advance :)

• how to merge Audio and video in C# windows form other than ffmpeg

  31 janvier 2018, par Tahir Mulla

  Im trying to merge audio and video using ffmpeg following is my code,
  problem is it take too much time for long video,is there any other way of merging audio and video files

          string Path_FFMPEG = Application.StartupPath + "\\ffmpeg.exe";
  
          string Wavefile = applicationPath + @"\Vizipp_Video_" + currentDateTime + ".wav"; ;
  
          string videoFile = applicationPath + @"\Vizipp_Video_" + currentDateTime + ".avi";
  
          string strResult = applicationPath + @"\Vizipp_Video_" + currentDateTime + ".mpg";
  
  
  
          System.Diagnostics.Process proc = new System.Diagnostics.Process();
  
  
  
  
  
              proc.StartInfo.Arguments = string.Format("-i {0} -i {1} {2}", Wavefile, videoFile, strResult);
  
              proc.StartInfo.UseShellExecute = false;
  
              proc.StartInfo.CreateNoWindow = false;
  
              proc.StartInfo.RedirectStandardOutput = true;
  
              proc.StartInfo.RedirectStandardError = true;
  
              proc.StartInfo.FileName = Path_FFMPEG;
  
              proc.Start();
  
              //string StdOutVideo = proc.StandardOutput.ReadToEnd();
  
              //string StdErrVideo = proc.StandardError.ReadToEnd();
  
              MessageBox.Show("Please wait while we are processing on your video recording...", "Vizipp", MessageBoxButtons.OK, MessageBoxIcon.Information);