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• Insert text on sequence of image and create video using imagemagick or graphicsmagick with node.js

  12 décembre 2015, par Keyur Sakaria

  I am trying to create a sequence of image with dynamic text using imagemagick and then convert into video using ffmpeg. The issue I am facing right now :

  1. I was able to put text on image but now I want to move that text and sync with the character on image. Below is the link of what I have achieved

  http://tinypic.com/player.php?v=2ciic8g%3E&s=9#.VmrAZUp97Dc

  The bright white "text goes here" text should sync with the character behind

  Below is the code which I have written

  gm("original_images/moving/" + text + ".png")
  
      .fill("#FCF7FB")
  
      .fontSize(40)
  
      .drawText(x, moveY, "text goes here", "center")
  
      .font("font/BTTTRIAL_1.ttf")
  
      .write("newImages/demo" + i + ".png", function(err)
  
      {
  
          count++;
  
          console.log("success : " + err);
  
          console.log("i : " + i);
  
          console.log("moving : " + moveX);
  
  
  
          if(count == 72)
  
          {
  
              console.log(count);
  
              var date = moment().format('MMMMDDYYYYhmmssa');
  
              var cmd = 'ffmpeg -r 17 -i newImages/demo%d.png -c:v libx264 -r 24 -pix_fmt yuv420p output/' + date + '.mp4';
  
  
  
              exec(cmd, function(error, stdout, stderr)
  
              {
  
                  console.log(error)
  
                  console.log(stdout)
  
                  console.log(stderr)
  
              });
  
          }
  
      });

  I am trying to calculate x and y according to image and im getting the values in decimal, which graphicsmagick is not considering and rounding it thus text is not syncing with image and goes up and down

  If you have any other suggestions or ways to achieve what im trying to do please let me know.

  Thanks in advance.

• FFMPEG detect position of text and hide/delogo

  9 novembre 2016, par Ates Özen

  I’ve tried a lot of ways to do that. Is it possible to detect the position of a text in a video and hide/watermark it with delogo in ffmpeg ?

  You can see something like what i want in this video at 30th second :
  https://www.youtube.com/watch?v=HxexmWk2Yh0

  In my situation the text is not rectangled.

• Optimize ffmpeg for text with mpeg1

  20 septembre 2022, par lmalves

  I'm kind of new to video enconding and decoding but I'm currently working with NodeJS and I need to stream the content of a window (using electron) to an angular app.

  


  In my current implementation I'm "grabbing" the app window content :

  


  ffmpeg -f gdigrab -i title="Windows App" -vcodec mpeg1video -r 30 -b:v 10  -bufsize:v 327680 -f rtp rtp://127.0.0.1:1234

  


  Then I'm conveting to http:

  


  ffmpeg -i rtp://127.0.0.1:1234 -protocol_whitelist file,crypto,udp,rtp,http,tcp -f mpegts -codec:v mpeg1video -s 500x515 -b:v 10 -bf 0 http://localhost:59655/

  


  And on the client app using MpegJS to display it with almost the default configuration.

  


  It works relativelly well except for some parts of text where if the font is smaller it's almost impossible to read it.

  


  Like I said I'm new on this and I'm not sure how to optimize it to text.
Any suggestions ?