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• How to extract transparent images in video with FFMPEG

  17 avril 2021, par El Šidëyøusš

  I have an Mp4 video with a black background, I managed to extract the images from the video with Ffmpeg but these images have a black background I would like to know how to make these images transparent, if it is possible with FFmpeg, thanks for your help

  


• How to enlarge a video without changing the resolution in python ? [closed]

  18 janvier 2024, par Killian Rakotonanahary

  I'm trying to convert a youtube video into a 9 : 16 video. So I'm scaling the video to 1080x1920, and it's returns me a minimized video with two black borders at the bottom and at the top.

  


  I would like to zoom into the video, so the video will be able to fill all the format, with ffmpeg, or opencv or moviepy.

  


  I tryied to crop the video with ffmpeg but the video is cropped without the black borders, like if the black borders wasnt a part of the file,
I tryed to zoom with ffmpeg but the zoompan continuously zoom during all the video, and the black borders are not affected by the zoom,
I tryed to remove the edges where the pixel value is less than or equal to a given threshold, but the ratio is not kept, and its result to a strechted video.
I would like to do something like https://new.express.adobe.com/tools/resize-video

  


  Enlarge the video without affecting the resolution, so it's just result to a zoom effect.

  


  The actual code is resizing the video to 9 : 16 with two black border at the bottom and on the top.

  


  def divideWithCheckPoints(checkpointRanges):
    videoPath = 'assets/video.mp4'
    output_folder = 'assets/'

    video_clip = VideoFileClip(videoPath)
    
    for i, (start_time, end_time) in enumerate(checkpointRanges):
        output_file = f'{output_folder}video_part_{i+1}.mp4'
        command = [
            'ffmpeg',
            '-i', videoPath,
            '-ss', str(start_time),
            '-to', str(end_time),
            '-vf', "scale=1080:1920",  # resize video
            '-c:a', 'aac',
            '-b:v', '1M',  
            output_file
        ]
        subprocess.run(command, check=True)
        
    last_start_time = checkpointRanges[-1][1]
    last_end_time = video_clip.duration  
    last_output_file = f'{output_folder}video_part_{len(checkpointRanges)+1}.mp4'
    command = [
        'ffmpeg',
        '-i', videoPath,
        '-ss', str(last_start_time),
        '-to', str(last_end_time),
        '-vf', "scale=1080:1920",  # resize video
        '-c:a', 'aac', 
        last_output_file
    ]
    subprocess.run(command)


  


  Output :

  


  

  


  Expected :

  


  

  


• Add a Text and a images to the video using ffmpeg

  26 février 2019, par Nguyễn Thành Đạt

  I have read this question in toppic :
  FFMPEG overlay two video and add text

  ffmpeg -i raw_video.mp4 -i watermark.png -i watermark2.png -filter_complex [0:v]drawtext=fontfile=font.ttf:text='text1':fontcolor=black@1.0:fontsize=24:x=20:y=259, drawtext=fontfile=font.ttf:text='text2':fontcolor=black@1.0:fontsize=24:x=500:y=500[text]; [text][1:v]overlay=215:0[ol1];[ol1][2:v]overlay=400:300[filtered]"-map "[filtered]" -codec:v libx264 -codec:a copy output.mp4  "

  I try to using this ffmpeg but it error .

  Please help me