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• drawtext with ffmpeg python

  22 mai 2024, par Wolf Wolf

  I am trying to add a text to a video using ffmpeg and python.
I tried to do this in the following ways, but it didn't work.

  


  first

  


  (
         ffmpeg
         .input(in_video)
         .filter('drawtext',
                 fontsize=30,
                 fontfile=r"D:\projects\python\editor_bot\downloads\Candara.ttf",
                 text='test test test.',
                 x='if (eq(mod(t\\, 15)\\, 0)\\, rand(0\\, (w-text_w))\\, x)',
                 y='if (eq(mod(t\\, 10)\\, 0)\\, rand(0\\, (h-text_h))\\, y)')
         .output(f'output-final.mp4')
         .run()
 )


  


  second

  


  fil = fr"drawtext=text='test test test':fontsize=30:fontfile=':\projects\python\editor_bot\downloads\Candara.ttf':x='if (eq(mod(t\, 15)\, 0)\, rand(0\, (w-text_w))\, x)':y='if (eq(mod(t\, 10)\, 0)\, rand(0\, (h-text_h))\, y)'"
    (
        ffmpeg
        .input(in_video)
        .output(f'output-final.mkv', filter_complex=fil)
        .run()
    )


  


  But by running this command

  


  ffmpeg -i v1.mp4 -filter:v drawtext="fontsize=30:fontfile=candara.ttf:text='testtest test.':x=if(eq(mod(t\,15)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,10)\,0)\,rand(0\,(h-text_h))\,y)" -c:a copy -c:v libx264 -preset slow -crf 18 V13.mkv


  


  In the terminal, what I want is done exactly

  


  thanks

  


• how to combine all chunk videos path into text file using ffmpeg

  31 juillet 2017, par Megha CS

  Task is to create final output video by combining all chunk videos recording from webcam using ffmpeg.

  For that, created process with passing the ffmpeg command as argument and save all chunk videos to local folder.

  code snippet :

  process =new Process();
  
  process.StartInfo.FileName = Directory.GetCurrentDirectory() + @"\ffmpeg.exe";
  
  process.StartInfo.Arguments = "-re -rtbufsize 1000M -f dshow -i video=" + "\"" + vidDevName + "\"" + " -acodec libvo_aacenc -ab 48kb -ar 22050 -ac 2 -b:a 128k -vcodec libx264 -r 25 -s 480x360 -pix_fmt yuv420p -preset medium -segment_time 10 -f segment output%03d.mp4";
  
  process.Start();

  Its working fine. But now, have to create text file of listing all chunk videos path and can create final output video by using "-f concat -safe 0 -i mylist.txt -c copy output.mp4" as an argument.

  Am stuck in creating text file with listing all chunk videos path in c#.
  I have used (for %i in (*.wav) do @echo file ’%i’) > mylist.txt to create text file. Its working fine in command prompt but not in C# application.
  So please suggest on this.

• Execute mp4box cmd via java got error

  6 novembre 2015, par Ducthien

  sorry when I tag ffmpeg because I couldn’t tag MP4Box.But I have proplem with excuted with ffmpeg via javacode too.
  I read at How to execute cmd commands via Java but i can’t find my proplem.

  I’m tested commands in cmd, it was ok :

  MP4Box -dash 10000 -dash-profile live -segment-name output- seg -rap
  -bs-switching no input.mp4

  but when i executed cmd via java code , i get error :

  Error - only one input file found as argument, please check usage

  Below is my code, has something wrong ?

  package com.uit.reformatvideo;
  
  
  
  import java.io.BufferedReader;
  
  import java.io.IOException;
  
  import java.io.InputStreamReader;
  
  import java.util.logging.Logger;
  
  
  
  public class ExecuteComandToFormatVideo {
  
  
  
      public final static String LINK_MP4BOX = "C:/MP4Box/Tools/MP4Box.exe";
  
      public final static String CREATE_MPD_ECLIPSE = "mp4box -dash 10000 -frag 1000 -rap -bs-switching no";
  
      public final static String CREATE_MPD_IE = "MP4Box -dash 10000 -dash-profile live -segment-name output-seg -rap -bs-switching no";
  
      private static final Logger log = Logger.getLogger(ExecuteComandToFormatVideo.class.getName());
  
  
  
  
  
      public static void main(String[] args) throws IOException, InterruptedException {
  
            String s = null;
  
  
  
              try {
  
  
  
              // run the Unix "ps -ef" command
  
                  // using the Runtime exec method:
  
                  String lsCmd[] = new String [2];
  
                  lsCmd[0] = LINK_MP4BOX;
  
                  lsCmd[1] = "MP4Box -dash 10000 -dash-profile live -segment-name output-seg -rap -bs-switching no input.mp4";
  
                  Process p = Runtime.getRuntime().exec(lsCmd);
  
                  p.waitFor();
  
                  BufferedReader stdInput = new BufferedReader(new
  
                       InputStreamReader(p.getInputStream()));
  
  
  
                  BufferedReader stdError = new BufferedReader(new
  
                       InputStreamReader(p.getErrorStream()));
  
  
  
                  // read the output from the command
  
                  System.out.println("Here is the standard output of the command:\n");
  
                  while ((s = stdInput.readLine()) != null) {
  
                      System.out.println(s);
  
                  }
  
  
  
                  // read any errors from the attempted command
  
                  System.out.println("Here is the standard error of the command (if any):\n");
  
                  while ((s = stdError.readLine()) != null) {
  
                      System.out.println(s);
  
                  }
  
  
  
                  System.exit(0);
  
              }
  
              catch (IOException e) {
  
                  System.out.println("exception happened - here's what I know: ");
  
                  e.printStackTrace();
  
                  System.exit(-1);
  
              }
  
      }
  
  
  
  }

  Here was out put :

  Here is the standard output of the command :

  Here is the standarderror of the command (if any) : Error - only one
  input file found as argument, please check usage