Avoid writing to disk with ImageSequenceClip

[diakonovm]

I am generating a significant number of images and writing them to disk. I then pass an array of the filenames to ImageSequenceClip. A major bottleneck is writing the images down to disk; is there a way to keep the images in memory then pass that to ImageSequenceClip, subsequently avoiding the time necessary to write/read to disk?

filenames = []
for i in range(0, FRAMES):
    filename = "tmp/frame_%s.png" % (i)
    filenames.append(filename)
    center_x = IMG_WIDTH / 2
    center_y = IMG_HEIGHT - ((IMG_HEIGHT - i * HEIGHT_INC) / 2) 
    width = IMG_WIDTH - i * WIDTH_INC
    height = IMG_HEIGHT - i * HEIGHT_INC
    img = vfx.crop(img_w_usr_img, x_center=center_x, y_center=center_y, width=width, height=height)
    img = img.resize( (VID_WIDTH, VID_HEIGHT) )
    img.save_frame(filename)
    print "Proccessed: %s" % (filename)

seq = ImageSequenceClip(filenames, fps=FPS)

[diakonovm]

I ended up using get_frame() to get the numpy array of the image and it works much faster now.

[Zulko]

The snippet you provide doesn't allow me to give the best answer. There are many ways to do this in MoviePy, e.g. using VideoClip or ImageSequenceClip:

def make_frame(t):
    return some_numpy_array #  corresponding to the frame to display at time t

clip = VideoClip(make_frame, duration).set_fps(20)
clip.write(videofilename)

or

frames = []
for i in range(50):
    frames.append(some_frame) # some_frame is a numpy array of an image

clip = ImageSequenceClip(frames, fps=20)
clip.write(videofilename)