CODEWITHSUNDEEP
pythonanimationimage-processingpython-imaging-librarywebp
Egor
Egor

Reputation: 167

Insert a new frame in the end of animated WEBP

I have a JPEG image I and a transform function F which has some state S. Every N minutes function's state changes and after that F is applied to my image I. So for the K'th change we have output image I_k which is saved to some directory FRAMES_DIR.

What I want to do is to have an animated WEBP with all generated images so far. Let's call it W_k = WEBP(I_1, ..., I_k). Also it should be done in memory without any saves on disk.

My current approach is using Python and PIL library and looks like that:

webp_frames = []

def get_webp():
    global webp_frames

    nb_frames_processed = len(webp_frames)
    for frame_idx, frame_path in enumerate(sorted(os.listdir(FRAMES_DIR))):
        if frame_idx < nb_frames_processed:
            continue
        frame = Image.open(os.path.join(FRAMES_DIR, frame_path))
        webp_frames.append(frame)

    webp = io.BytesIO()
    webp_frames[0].save(webp, format='WEBP', save_all=True, loop=0, append_images=webp_frames[1:], duration=400)
    return webp

The problem is that after each call of get_webp webp is generated from scratch. It is very slow and has O(K) complexity. I want to find a way to make it in O(1) time by appending a new frame to the end of current WEBP file. Is there any pretty way to do it in Python?

Upvotes: 0

Views: 61

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