[Feature Request]: Allow for selection of video used for color coherence.

Is there an existing issue for this?

[X] I have searched the existing issues and checked the recent builds/commits

What would your feature do ?

Currently, the Color Coherence open of Video Input uses the video defined in Init -> Video Init, but it would be beneficial to have an additional field called Alt Video Init that allows the user to define which video to use. In this way, the user had a lot more control over the color coherence.

Proposed workflow

Adding a video file name field under Color Coherence when Alt Video Input is selected

Additional information

This could be implemented by extracting the frames from a video to subfolder called "colorframes" if Alt Video Init is activated, and then in render.py there would be added similar code to what exists now:

        if anim_args.color_coherence == 'Alt Video Input' and hybrid_available:
            if int(frame_idx) % int(anim_args.color_coherence_video_every_N_frames) == 0:
                prev_vid_img = Image.open(os.path.join(args.outdir, 'colorframes', get_frame_name(anim_args.video_init_path) + f"{frame_idx:09}.jpg"))
                prev_vid_img = prev_vid_img.resize((args.W, args.H), PIL.Image.LANCZOS)
                color_match_sample = np.asarray(prev_vid_img)
                color_match_sample = cv2.cvtColor(color_match_sample, cv2.COLOR_RGB2BGR)

The number of frames generated in colorframes would be equal to the number of frames in inputframes, but the user could a video of any length, and the extracting code could easily calculate the correct number of frames via interpolation. expansion, and decimation.

Are you going to help adding it?

I am happy to contribute to the degree I am capable of. I have looked at the code, and I have more questions than understanding about it, but this task seems simple enough for me to attempt if I get a few pointers.

My discord ID is 1064991849149898822

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