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• How to scape special characters for linux, nodejs exec function

  22 février 2023, par David Chavez

  I'm running this ffmpeg command on my linux server and while I paste it into the terminal, it works just fine but as soon as I use execPromise to run the EXACT same command, it returns an error.

  


  const { exec } = require('child_process');
const { promisify } = require('util');
const execPromise = promisify(exec);

const encode = async ffmpegCode => {
    try {
        console.log(ffmpegCode) //Here I can see that the code is the
                                //exact same one than the one that works
                                //when pasted into the terminal
        await execPromise(ffmpegCode);
        return 200
    } catch (err) {
        console.log(err)
    }
}


  


  I need \: to be interpreted as such. When I type it as is, \:, the error message shows me that it interpreted it as : which is expected.

  


  If I pass in \\:, I expect it to interpret it as I need it which would be \: but the error shows me that it interprets it as \\:.

  


  \\\: is interpreted as \\: and \\\\: is interpreted as \\\\:.

  


  Part of the command passed :

  


  ...drawtext=text='timestamp \\: %{pts \\: localtime \\: 1665679092.241...

  


  Expected command :

  


  ...drawtext=text='timestamp \: %{pts \: localtime \: 1665679092.241...

  


  Error message :

  


  ...drawtext=text='timestamp \\: %{pts \\: localtime \\: 1665679092.241...

  


  How do I get /: through to the exec function ?

  


• FFMPEG in Java (runtime error)

  4 juillet 2012, par Eric

  I want to write a program that converts video into frames using FFMPEG. When I use it on the Ubuntu terminal, it works fine. But when I try to put it into the Java code, it gives me a runtime error. Did I make a mistake in my code below ?

  import java.util.*;
  
  import java.awt.*;
  
  import java.lang.*;
  
  import java.lang.Runtime;
  
  import java.io.*;
  
  import java.io.IOException;
  
  
  
  public class ConvertVideoToImage
  
  {
  
      private SingletonServer ss = null;
  
  
  
      public ConvertVideoToImage(SingletonServer ss)
  
      {
  
          this.ss = ss;
  
      }
  
  
  
      public void run()
  
      {
  
          convertVideo();
  
      }
  
  
  
      public void convertVideo()
  
      {
  
          try
  
          {
  
              Runtime rt = Runtime.getRunTime().exec("ffmpeg" + "-i" +         "display.wmv" + "image%d.jpg");
  
          }
  
          catch(Exception e){}
  
      }
  
  
  
  }

  Edit :

  I have changed the code like you suggested, but it also doesn't work. And when I Googled it, I found out that someone put the full path inside the executable and it became like this :

  Runtime.getRuntime().exec("/home/pc3/Documents/ffmpeg_temp/ffmpeg -i display.wmv image%d.jpg")

  BTW, thanks for the reply. I have another question. Is it possible to make a counter for FFMPEG ? I used this command in the Ubuntu terminal to make it convert a video to 30 frames/1seconds :

  ffmpeg -i display.wmv image%d.jpg

  This will automatically generate numbers like image1.jpg, image2.jpg, to image901.jpg. Is it possible to make a counter for this ? Because I need to count the files and control the number.

  Thanks in advance.

• How to downsample all the videos in a folder ?

  23 mai 2021, par amarykya_ishtmella

  I had asked this question before, I have a solution using the moviepy library. But, this is taking a lot of time.
  
I know that when I use ffmpeg via the terminal, the down sampling process is much faster.

  


  command = (
            f"ffmpeg -n -i {'inputvideo_path'} -filter:v "
            f"scale={width}:{height} {{}}-c:a copy {output_path}"
        )


  


  I am looking for the implementation in ffmeg library