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• ffmpeg : pad filter with transparent background for GIF input/output ?

  23 janvier 2023, par Yami Odymel

  I'm trying to pad the GIF source to a square thumbnail and the extended area should be transparent.

  


  (image source : https://store.steampowered.com/app/2113680/The_Dot/)

  


  

  


  To achieve the goal, I used the following command :

  


  ffmpeg -i ./test/source.gif -filter_complex "[0]scale=255:144[s1];[s1]pad=256:256:0:-56:blue[s2];[s2]split[s3][s4];[s3]palettegen=reserve_transparent=on:transparency_color=blue[p];[s4][p]paletteuse[s5]" -map [s5] -loop 0  ./test/output.gif -y


  


  


  1. [0]scale=255:144[s1]
     First I scale down the image.

     


  


  2. [s1]pad=256:256:0:-56:blue[s2]
     Then pad the image with an uncommon background color : blue

     


  


  3. [s2]split[s3][s4]
     And I split to two streams. One for palettegen and another for paletteuse.

     


  


  4. [s3]palettegen=reserve_transparent=on:transparency_color=blue[p]
     Generate the color palette that indicates blue as the transparency_color

     


  


  5. [s4][p]paletteuse[s5]
     Use the new color palette for output. The padded image with blue background color should be treated as a transparent background.

     


  


  


  But the output animated GIF still has a visible blue background color no matter if I put the paletteuse at first or in the end.

  


  

  


  Related posts :

  


  

  • Making GIFs with ffmpeg : what does "transparency_color" do ?

  


  • How do I resize an animated GIF and keep transparency ?

  


  • Transparency is gone while resizing (scaling) gif using ffmpeg

  


  


• ffmpeg how to add different audio affects to video

  1er juin 2020, par 3sd

  windows 7 64 using ff-mpeg latest version downloaded command-line.
  

  



  1:how do i distortion the background audio sound of drums or bass or anything but not affect the voice.
2:how do i add a sound something similar to audio is ripping,like a page ripping sound.
  
3:how do i randomly add a overlay sound effect of distortion something similar to -b 18k
  

  



  -b 18k decreases the audio quality i think and i am looking to do something similar in different variations.

  


• converting audio file and return it

  22 avril 2020, par louay jaber

  I'm trying to convert an mp3 file to wav file. using the following code

  



  def change_file(file):
    print(file)
    wav='fff'+'.wav'
    print('here ')
    mp3_file=file
    sound=pydub.AudioSegment.from_mp3(mp3_file)
    sound=sound.set_frame_rate(8000)
    temp=sound.export(wav, format="wav")

    return temp//doesnt work


  



  the sound.export saves the file on my machine I don't want it to be saved I want to return it immediately cause I am using this code as an API in Django
so my goal is to except a file and convert it then return it