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• Record local audio in a docker container

  17 juillet 2015, par pablo

  How can I record the audio of an application like Firefox inside a docker container with ffmpeg ?
  I’ve found examples how to forward pulseaudio to the host - netflix, skype.

  When I’m trying to use pactl :

  pactl list sources

  Or

  docker exec -it  bash
  
  apt-get install pulseaudio
  
  pactl load-module module-native-protocol-unix auth-anonymous=1 socket=/tmp/.pulse-socket

  I’m getting an error :

  Connection failure: Connection refused
  
  pa_context_connect() failed: Connection refused

  This also fail

  ffmpeg -f pulse -i default /tmp/pulse.wav

• 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 :) !

  


• is there a way to change dynamic the water mark text color when using ffmpeg depending on the background color when recording a vieo file ?

  11 juillet 2023, par Shelly Ron

  This command in the command prompt window is working fine and recording the entire screen :

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -preset ultrafast -pix_fmt yuv420p out.mp4


  


  this command prompt add a water mark text in the middle of the screen in white color :

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -vf "drawtext=fontfile=path/to/arial.ttf:text='All rights reserved to ...':fontsize=24:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2" -preset ultrafast -pix_fmt yuv420p out.mp4


  


  the problem is that the water mark text is in white and i can see it only when the background window color is black for example when i bring to the front the ffmpeg console window :

  


  

  


  but when it's recording some window with white background, because the text is white it can't be seen.

  


  I want to update the command prompt of the ffmpeg to make somehow dynamic so if the background window is black show the water mark text in white and then if I'm bringing up a window with background white change the water mark text automatic to black.

  


  this is the command i tried for the dynamic effect but it didn't work i got errors and then i tried so many versions of the command line, but nothing helped or worked.

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -filter_complex "[0:v]drawtext=text='Watermark Text':x=(w-text_w)/2:y=(h-text_h)/2:fontfile=arial.ttf:fontsize=24,format=rgba [txt];[txt]split=2 [bw][wc];[bw]lut=r=val*2 [b];[wc]lut=r=val*0.5+0.5:g=val*0.5+0.5:b=val*0.5+0.5 [wc];[wc][b]alphamerge [wm];[wm][0:v]overlay=10:10[outv]" -c:v libx264 -preset ultrafast -map "[outv]" out.mp4


  


  and also tried this

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -filter_complex "[0:v]drawtext=text='Watermark Text':x=(w-text_w)/2:y=(h-text_h)/2:fontfile=Arial.ttf:fontsize=24,format=rgba [txt];[txt]split=2 [bw][wm];[bw][1:v]split=3 [b][g][r];[b]geq=r=0:g=0.5:b=0 [b];[g]geq=r=0:g=0:b=0.5 [g];[r]geq=r=0.5:g=0:b=0 [r];[wm][b][g][r]merge=3,format=rgba [watermark];[0:v][watermark]overlay=x=(W-w)/2:y=(H-h)/2" -map "[watermark]" -map 0:a? -c:v libx264 -c:a copy -preset ultrafast out.mp4