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• FFMPEG : cut clips from a long video with "fast seek" while maintaining accuracy

  15 août 2020, par japseow

  I have this 3 hour long video which consists of <1-5 seconds of black frames> — < clip > — <1-5 seconds of black frames> — < clip > — ...

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  I could successfully get the clip without the black frames with the slow seek, but it takes over 4 minutes just for seeking.

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  ffmpeg -y -i "C:\Users\user\Videos\obs\part1.mp4" -ss 4370.48 -to 4384.95 -c:a copy -c:v hevc_nvenc -rc vbr_hq -cq 19 -b:v 10000k -maxrate:v 12500k "C:\Users\user\Videos\obs\____delete1.mp4"

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  I tried using the fast seek which takes only 4 sec, but it includes a 4 sec blackframe chunk at the end of the video. The output that should've been 14 sec long became 18 sec.

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  ffmpeg -y -ss 4370.48 -i "C:\Users\user\Videos\obs\part1.mp4" -to 14.47 -c:a copy -c:v hevc_nvenc -rc vbr_hq -cq 19 -b:v 10000k -maxrate:v 12500k "C:\Users\user\Videos\obs\____delete2.mp4"

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  My video has around 640 clips so it's impractical to wait that long just for seeking, and it'll only get worse when I'll be seeking at around the 2+ hour mark.

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• 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

• 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.

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  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.

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  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,&#xA;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,&#xA;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.&#xA;I would like to do something like https://new.express.adobe.com/tools/resize-video

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

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

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  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)


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  Output :

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  Expected :

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