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Sur d’autres sites (8207)

  • FFMPEG control delay and looping for generating APNG

    24 septembre 2020, par fmw42

    I have a (random selection) of JPG images that I want to use to make into an APNG animation using ffmpeg (to test the process). They are all the same dimensions (256x256). But I cannot seem to get the correct syntax to control the frame delay and loop control (to loop forever). Is it possible to set these parameters using ffmpeg when creating an APNG from a sequence of images ? If so, can someone provide the proper syntax and/or show an example command ? I have searched the ffmpeg documentation and cannot seem to find relevant syntax.

    


    I can do the following, but it will not accept -delay nor -loop. I use Imagemagick to pipe in the images.

    


    This works, but does not loop, and runs very fast.

    


    magick lena.jpg mandril3.jpg monet2.jpg zelda1.jpg PNG:- | ffmpeg -i - x.apng


    

    


    This gives errors about delay and/or loop :

    


    magick lena.jpg mandril3.jpg monet2.jpg zelda1.jpg PNG:- | ffmpeg -i - -delay 1000 -loop -1 x.apng


    

    


    I am also curious to know if it is possible to specify a sequence of images directly in ffmpeg as input without using ImageMagick.

    


    Sorry, I am a relative novice with ffmpeg. I am using ffmpeg 4.2.1.

    


  • Directly download the output file to client desktop

    11 novembre 2020, par jsdbt

    I am processing a video file using ffmpeg, in AWS lambda. My file size is 1gb. I don't want to store the processed file in /tmp folder (or efs).

    


    Is there a way I can directly download the output file to the user's desktop, from AWS lambda ?

    


  • Youtube-dl : Download video with maximum FPS and change FPS using OpenCV

    8 mai 2021, par MmBaguette

    I'm trying to download a YouTube video using YouTube-dl and specifying a maximum FPS. I don't want the lowest FPS, but I also don't want an FPS higher than 30. The code below does not work, but it was my best attempt.

    


    ydl_opts = {
    'format': '(bestvideo[fps<30]/bestvideo)+bestaudio/best', # CHANGE FOR VIDEO
    'outtmpl': "youtube_video.%(ext)s",
}
print("Downloading YouTube video.")
                
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
     ydl.download([text])


    


    If not, can I change the FPS of a video using OpenCV ? I tried using cap.set(cv2.CAP_PROP_FPS) but this doesn't work either.

    


    cap = cv2.VideoCapture(file)
fps = cap.get(cv2.CAP_PROP_FPS)
print(fps) # prints 60.0
cap.set(cv2.CAP_PROP_FPS)
fps = cap.get(cv2.CAP_PROP_FPS)
print(fps) # 60.0 again


    


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