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  • Video is black when framerate is too low using imageio and Python

    28 juin 2018, par palimboa

    I have the following exmaple code :

    import numpy as np
    
writer = imageio.get_writer('test.mp4', fps=1)
    

    
max = 800
    
resolution = 256
    

    
for idx in range(1, max):
    
    img = np.zeros((resolution,resolution))
    
    img[: int((idx / max) * resolution), : int((idx / max) * resolution)] = 255
    
    img = img.astype(np.uint8)
    
    writer.append_data(img)
    

    
writer.close()

    The video is just black for fps == 1

    What am I missing here ? I cannot see any clues in the documentation saying I cannot have fps = 1 ?

    EDIT

    For fps >= 10 it seems to be fine.

  • Every 27 seconds immediately appear around 3 seconds black

    23 juin 2018, par Monso

    I want every 27 seconds. appears a black space of 3 seconds and it repeats to the end. Example 0:27 0:54 1:21 until the end of the video .... here are 2 code I used but the second code does not work. The 1st code it automatically blurs the population, I want it not to fade itself. that i want it immediately black
    .please help me finish it

     Code 1
    
       ffmpeg -i input.mp4 -loop 1 -i logo.png -filter_complex "[1]trim=0:24,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1,loop=999:750:0,setpts=N/25/TB[w];[0][w]overlay=shortest=1" output.mp4
    

    
 Code 2
    
       ffmpeg -i input.mp4 -vf "select='lt(mod(t,30),27)',setpts=N/FRAME_RATE/TB" output.mp4

  • create a zoom pad effect with ffmpeg but instead of black background put a image background ?

    16 juin 2018, par MIGHTDUY

    i need to create a zoom effect with frame image background instead of black background

    how is possible this

    please help me

    this is my command

    ffmpeg -i duke2.jpg    -filter_complex      "pad=  w=560:h=200:x='(ow-iw)/2':y='(oh-ih)/2',zoompan=  z='zoom+0.002':d=25*4:s=1280x800"    -pix_fmt yuv420p -c:v libx264 zzout.mp4

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