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Using Stable Diffision models for Colorization
#38
Quick and Dirty: just running all frames through the server:
# Imports import sys import os import vapoursynth as vs # getting Vapoursynth core core = vs.core # Limit frame cache to 48449MB core.max_cache_size = 48449 # Import scripts folder scriptPath = 'F:/Hybrid/64bit/vsscripts' sys.path.insert(0, os.path.abspath(scriptPath)) # loading plugins core.std.LoadPlugin(path="F:/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/fmtconv.dll") core.std.LoadPlugin(path="F:/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/libbestsource.dll") # Import scripts import validate # Source: 'G:\TestClips&Co\files\test.avi' # clip current meta; color space: YUV420P8, bit depth: 8, resolution: 640x352, fps: 25, color matrix: 470bg, color primaries: Unspecific, color transfer: Unspecified, yuv luminance scale: limited, scanorder: progressive, full height: true ((Source)) # Loading 'G:\TestClips&Co\files\test.avi' using BestSource clip = core.bs.VideoSource(source="G:/TestClips&Co/files/test.avi", cachepath="J:/tmp/test_bestSource", track=0, hwdevice="opencl") import xmlrpc.client import io import numpy as np from PIL import Image clip_rgb = core.resize.Bicubic(clip, format=vs.RGB24, matrix_in_s="470bg") proxy = xmlrpc.client.ServerProxy("http://127.0.0.1:8765/", use_builtin_types=True) PROMPT = "Colorize this black and white image with natural, realistic colors." def frame_to_png_bytes(f): w, h = f.width, f.height # VapourSynth R55+: planes are accessed with frame[plane] r = np.asarray(f[0]) g = np.asarray(f[1]) b = np.asarray(f[2]) arr = np.dstack([r, g, b]) img = Image.fromarray(arr, "RGB") buf = io.BytesIO() img.save(buf, format="PNG") return xmlrpc.client.Binary(buf.getvalue()) def write_png_to_frame(fout, png_bytes_data): out_img = Image.open(io.BytesIO(bytes(png_bytes_data))).convert("RGB") out_arr = np.array(out_img) for plane_idx in range(3): np.copyto(np.asarray(fout[plane_idx]), out_arr[:, :, plane_idx]) # Process pairs: frame N and N+1 together # Use FrameEval with a clip-of-clips approach, or simply process even frames # and carry the paired result. A simpler approach for offline encoding: num_frames = clip_rgb.num_frames results = {} # cache colorized frames def colorize_paired(n, f): if n in results: return results.pop(n) fout = f.copy() # Get frame n png1 = frame_to_png_bytes(f) # Get frame n+1 (if exists) n2 = min(n + 1, num_frames - 1) f2 = clip_rgb.get_frame(n2) png2 = frame_to_png_bytes(f2) fout2 = f2.copy() result = proxy.colorize_frame_pair(png1, png2, PROMPT, 8) # gap_px=8 is the separator between the two images during inference if result["ok"]: write_png_to_frame(fout, result["data1"]) write_png_to_frame(fout2, result["data2"]) if n2 != n: results[n2] = fout2 # cache the second result return fout colorized = core.std.ModifyFrame(clip_rgb, clip_rgb, colorize_paired) output = core.resize.Bicubic(colorized, format=vs.YUV420P8, matrix_s="470bg") output.set_output()

with this I get ~4s/frame
2026-05-12 19:44:26,630 [INFO] colorize_frame_pair: 13.94s (6.97s/frame) 100%|████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.64s/it] 2026-05-12 19:44:54,805 [INFO] colorize_frame_pair: 7.55s (3.78s/frame) 100%|████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.63s/it] 2026-05-12 19:49:00,028 [INFO] colorize_frame_pair: 8.40s (4.20s/frame) 100%|████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.73s/it] 2026-05-12 19:49:37,091 [INFO] colorize_frame_pair: 8.01s (4.00s/frame) 100%|████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.64s/it] 2026-05-12 19:49:44,713 [INFO] colorize_frame_pair: 7.48s (3.74s/frame) 100%|████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.64s/it] 2026-05-12 19:49:52,345 [INFO] colorize_frame_pair: 7.49s (3.75s/frame) 100%|████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.67s/it] 2026-05-12 19:50:00,027 [INFO] colorize_frame_pair: 7.54s (3.77s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.63s/it] 2026-05-12 19:50:07,564 [INFO] colorize_frame_pair: 7.40s (3.70s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.66s/it] 2026-05-12 19:50:15,198 [INFO] colorize_frame_pair: 7.50s (3.75s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.67s/it] 2026-05-12 19:50:22,959 [INFO] colorize_frame_pair: 7.62s (3.81s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.67s/it] 2026-05-12 19:50:30,665 [INFO] colorize_frame_pair: 7.56s (3.78s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.63s/it] 2026-05-12 19:50:38,270 [INFO] colorize_frame_pair: 7.46s (3.73s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.63s/it] 2026-05-12 19:50:45,998 [INFO] colorize_frame_pair: 7.58s (3.79s/frame) 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 2/2 [00:03<00:00, 1.68s/it] 2026-05-12 19:50:53,992 [INFO] colorize_frame_pair: 7.84s (3.92s/frame)

Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
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RE: Using Stable Diffision models for Colorization - by Selur - 12.05.2026, 19:51

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