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• How to add background image for text with text size on a video in FFmpeg ?

  24 octobre 2019, par manwtein

  Is there way to add a background image under the text on the video in FFmpeg ?

  I can add black background using ’box’, but i need to add some certain image. I tried to use ’drawtext’ on a image and then overlayed it on the video, but i don’t know text’s width and height for scaling the image.

  "-i",
  
  "D:/AndroidProjects/Movies/VideoSamples/VideoShort1.mp4",
  
  "-i",
  
  "D:/AndroidProjects/Movies/ImageSamples/SampleImage.jpeg",
  
  "-filter_complex",
  
  "[0:v]drawtext=text='Example':fontcolor=#DB7093:fontsize=120:box=1:boxcolor=black@0.8:boxborderw=5:x='(w/2) - (tw/2)':y='h - ((h/2) - (th/2))",
  
  "-s",
  
  "1280x720",
  
  "-y",
  
  "D:/AndroidProjects/Movies/FFmpegSampleShort0.mp4"

  I expect to get video with some image background under my text instead black color.
  

• Record specific window using ffmpeg

  5 décembre 2022, par Ahmed A. Mansour

  I have been trying the below code (which I found on other similiar problem on this site here : How to record a specific window using ffmpeg But it gives me black video and the same video is not playable by windows media player (it works on vlc but with black video..)

  


  ffmpeg -f gdigrab -framerate 30 -i title="german.avi - VLC media player" -b:v 3M  germ.flv


  


  Video example :
Weird thumbnail by WMP which shows it can't play it
Black screen as described, but it opens with black video in VLC

  


  I tried the other suggestions, but this one sometimes (less than 40% of the time) works.
I also noticed it doesn't show the window main title, which is a bit confusing, as it causes the mouse cursor to appear a little down where it should be.

  


• Loop through images, detect if contains color, put in subfolder

  16 avril 2022, par Samo

  I have two kinds of images in my folder : One is all black, the other one is black with yellow (#f8fa27). I am trying to put all the images with yellow colour in a subfolder. But I don't know how this is applicable.

  


  I would like to implement this with ImageMagick or FFMPEG. If possible, shell is redundant and I would like the loop via CMD. If you happen to know of another option that also works, that's no problem either.

  


  I've read about https://imagemagick.org/script/fx.php but I don't know how to apply it with my poor skills.

  


  Edit for now I managed to fix it with python (shitty code but it works)

  


  import cv2
import os
import glob

#check if extension is png
for filename in glob.glob("*.png"):
    #return to folder where all images are saved
    os.chdir('C:/Users/.../.../images')
    #make image black and white
    image = cv2.imread(filename, 0)
    #if image is fully black
    if cv2.countNonZero(image) == 0:
        print ("Black image, skipped")
    else:
        #colored image
        print ("Colored image")
        #restore true colors (rgb in my case, check wiki)
        image = cv2.imread(filename, cv2.COLOR_BGR2RGB)
        #folder to save colored images
        os.chdir(os.getcwd()+"/yellow")
        #save image to subfolder
        cv2.imwrite(filename,image)


  


  Thank you :) !