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• 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);

• 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.

  


• how can I get the length of an video in order to validate django form before upload can begin ?

  20 juin 2018, par GetItDone

  I have an app running on heroku that allows users to upload videos, then I use ffmpeg to preform 3 tasks using celery and redis-to-go :

  1) Check the format and if it isn't already mp4, convert it to mp4.
  
  2) Extract a 3 minute clip, in mp4 format
  
  3) Grab an image from the video

  The problem is that I want to verify the video length before the video is uploaded and the three tasks are run since I want to make sure all videos are at least 15 minutes, and if not I want to raise a ValidationError. So when validating the form, I want to do something like this :

  def clean(self, *args, **kwargs):        
  
      data = super(ContentTypeRestrictedVideoField, self).clean(*args, **kwargs)
  
  
  
      file = data.file
  
      try:
  
          content_type = file.content_type
  
          main, extension = content_type.split('/')
  
          if content_type in self.content_types:
  
              if file._size > self.max_upload_size:
  
                  raise forms.ValidationError(_('Please keep filesize under %s. Current filesize %s') % (filesizeformat(self.max_upload_size), filesizeformat(file._size)))
  
              if VIDEO_LENGTH < MINIMUM_LENGTH:
  
                  raise forms.ValidationError(_('Please make sure video file is at least %s. Current video length %s') % (MINIMUM_LENGTH, VIDEO_LENGTH)
  
          else:
  
              raise forms.ValidationError(_('File type is not supported. File must be mov, flv, avi, mpeg, wmv, or mp4.'))
  
      except AttributeError:
  
          pass        
  
  
  
      return data

  What could I do for VIDEO_LENGTH and MINIMUM_LENGTH ? I read that ffprobe could be used for getting the duration, but it isn’t available with the buildpack I am using and I am very inexperienced. I can’t just validate file size because it can vary greatly depending on numerous factors. Anyone have any solution as to what I could try ? Thanks