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• Grab frame without downloading whole file ?

  12 janvier 2012, par Writecoder

  Is this possible using php + ffmpeg ?

  ffmpeg-php has the ability to :

  Ability to grab frames from movie files and return them as images that
  can be manipulated using PHP's built-in image functions. This is great
  for automatically creating thumbnails for movie files.

  I just don't want to download the whole file before doing so.
  So lets say i want to grab a frame @ 10% of the movie :

  First lets get the size of remote file :

  $ch = curl_init(); 
  
  curl_setopt($ch, CURLOPT_HEADER, true); 
  
  curl_setopt($ch, CURLOPT_NOBODY, true);
  
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); 
  
  curl_setopt($ch, CURLOPT_URL, $url); //specify the url
  
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 
  
  $head = curl_exec($ch);
  
  
  
  $size = curl_getinfo($ch,CURLINFO_CONTENT_LENGTH_DOWNLOAD);

  Then it's quite easy to download only 10% of the .flv or .mov file using curl.

  But the framegrab trick using ffmpeg-php probably won't work because the file probably is corrupted ?

  Any other ideas ?

• Too many FFMPEG process

  21 avril 2014, par Mrslipp3ry

  I have a list of video files and I want to convert them with ffmpeg. This is my code :

      public static void ConvertToMp3(String inputPath, String title)
  
      {
  
          String outputpath = "\"D:\\Mp3\\" + title + ".mp3\"";
  
  
  
          String _out;
  
          Process p = new Process();
  
  
  
          p.StartInfo.UseShellExecute = false;
  
          p.StartInfo.RedirectStandardInput = true;
  
          p.StartInfo.RedirectStandardOutput = true;
  
          p.StartInfo.RedirectStandardError = true;
  
          p.StartInfo.CreateNoWindow = true;
  
          p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
          p.StartInfo.FileName = "ffmpeg";
  
          p.StartInfo.Arguments = " -i \"" + inputPath + "\" -vn -f mp3 -ab 192k " + outputpath;
  
  
  
          p.Start();
  
          p.StandardOutput.ReadToEnd();
  
          _out = p.StandardError.ReadToEnd();
  
          p.WaitForExit();
  
  
  
          if(!p.HasExited)
  
              p.Kill();
  
  
  
          Console.WriteLine(_out);   
  
      }

  It works fine, but when I call this function in a loop for n times, it opens too many processes. I want to open only one process at a time and when it’s done, go to the next.

• Download from YouTube as ".wav" instead of ".webm"

  11 août 2022, par Bastian Gerjol

  I am trying to extract an audio from a YouTube Video as an .wav file.
However, the script that I am running keeps giving me .webm files.
The code I am using is the following :

  


  from __future__ import unicode_literals
import youtube_dl

ydl_opts = {
    'format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'wav',
        'preferredquality': '192'
    }],
    'postprocessor_args': [
        '-ar', '16000'
    ],
    'prefer_ffmpeg': True,
    'keepvideo': True
}

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(['https://www.youtube.com/watch?v=2Xq7iJKzhR4'])


  


  Is there a way to change the output and keep the highest possible audio quality ?

  


  I tried setting prefer_ffmpeg': True to False & keepvideo': True to False but that did not change anything.

  


  I would appreciate suggestions and please keep in mind that I never used Python before.