commit 6c18827b932f6497d63e48b3311e323a930b3e5c
Author: Hannes <h.gehrmann@campus.tu-berlin.de>
Date:   Sun Mar 8 00:44:40 2026 +0100

    after gemini

diff --git a/sync_by_time.py b/sync_by_time.py
new file mode 100644
index 0000000..7fb18f8
--- /dev/null
+++ b/sync_by_time.py
@@ -0,0 +1,46 @@
+import subprocess
+
+video_a = "/home/honney/projects/mkv/Saga of Tanya the Evil/Season 1/Saga Of Tanya The Evil - S01E01 - The Devil Of The Rhine.mkv"
+video_b = "/home/honney/projects/mkv/Saga of Tanya the Evil (2017-2017) [imdbid-tt6455986]/Season 01/Saga of Tanya the Evil S01E001.mkv"
+
+offset_seconds = -0.1918081918081918
+offset_ms = offset_seconds * 1000
+preview_length = 10
+# 0.1 entspricht 1/10 der Geschwindigkeit
+speed_factor = 0.1 
+
+filter_complex = (
+    f"[1:v]scale=640:-1[left_vid];" 
+    f"[0:v]scale=640:-1,hflip,drawtext="
+    f"fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf:"
+    f"text='Offset\\: {offset_ms:.2f}ms':"
+    f"x=10:y=10:fontsize=24:fontcolor=white:box=1:boxcolor=black@0.5[right_vid];"
+    f"[left_vid][right_vid]hstack=inputs=2"
+)
+
+# Schritt 1: Video rendern
+cmd_ffmpeg = [
+    "ffmpeg", "-y",
+    "-itsoffset", f"{offset_seconds:.6f}", "-i", video_b,
+    "-i", video_a,
+    "-filter_complex", filter_complex,
+    "-t", str(preview_length),
+    "-c:v", "libx264",
+    "-crf", "18",
+    "-preset", "fast",
+    "sync_preview.mp4"
+]
+
+# Schritt 2: MPV starten
+cmd_mpv = [
+    "mpv",
+    f"--speed={speed_factor}",
+    "--title=Sync-Check (1/10 Speed)",
+    "sync_preview.mp4"
+]
+
+print("Rendere Vorschau...")
+subprocess.run(cmd_ffmpeg)
+
+print("Starte MPV...")
+subprocess.run(cmd_mpv)
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diff --git a/temporal_correlation.py b/temporal_correlation.py
new file mode 100644
index 0000000..1a6fc3f
--- /dev/null
+++ b/temporal_correlation.py
@@ -0,0 +1,95 @@
+import subprocess
+import numpy as np
+import matplotlib.pyplot as plt
+from scipy.interpolate import interp1d
+
+# --- Setup ---
+video_a = "/home/honney/projects/mkv/Saga of Tanya the Evil/Season 1/Saga Of Tanya The Evil - S01E01 - The Devil Of The Rhine.mkv"
+video_b = "/home/honney/projects/mkv/Saga of Tanya the Evil (2017-2017) [imdbid-tt6455986]/Season 01/Saga of Tanya the Evil S01E001.mkv"
+
+FPS_NATIVE = 24000/1001
+WIDTH = 160
+HEIGHT = int((WIDTH/16)*9)
+MAX_OFFSET_SECONDS = 1 
+
+# FAKTOR FÜR PRÄZISION: 
+# 2 = Doppelte FPS für die Rechnung (Sub-Frame)
+# 10 = Zehnfache Präzision (reicht für Mikrosekunden-Sync)
+UPSAMPLE_FACTOR = 10 
+FPS_VIRTUAL = FPS_NATIVE * UPSAMPLE_FACTOR
+
+def extract_hist_signal(video):
+    proc = subprocess.Popen([
+        "ffmpeg", "-loglevel", "error", "-i", video,
+        "-vf", f"scale={WIDTH}:{HEIGHT},format=gray",
+        "-f", "rawvideo", "-"
+    ], stdout=subprocess.PIPE)
+
+    frame_size = WIDTH * HEIGHT
+    hist_signal = []
+    while True:
+        data = proc.stdout.read(frame_size)
+        if not data or len(data) < frame_size: break
+        frame = np.frombuffer(data, dtype=np.uint8)
+        hist, _ = np.histogram(frame, bins=64, range=(0, 255))
+        hist_signal.append(hist / (np.sum(hist) + 1e-6))
+    proc.wait()
+    return np.array(hist_signal)
+
+print(f"Extracting signals (Native FPS: {FPS_NATIVE:.4f})...")
+a_raw = extract_hist_signal(video_a)
+b_raw = extract_hist_signal(video_b)
+
+# 1. In 1D-Signal umwandeln (Helligkeits-Schnitt)
+sig_a_raw = np.mean(a_raw, axis=1)
+sig_b_raw = np.mean(b_raw, axis=1)
+
+# 2. UPSAMPLING (Die "doppelte FPS" Logik)
+# Wir erstellen eine glatte Kurve durch die Frames und tasten sie feiner ab
+def upsample_signal(sig, factor):
+    x = np.arange(len(sig))
+    f = interp1d(x, sig, kind='cubic') # Kubische Interpolation für weiche Übergänge
+    x_new = np.linspace(0, len(sig) - 1, len(sig) * factor)
+    return f(x_new)
+
+print(f"Upsampling signals by factor {UPSAMPLE_FACTOR}...")
+sig_a = upsample_signal(sig_a_raw, UPSAMPLE_FACTOR)
+sig_b = upsample_signal(sig_b_raw, UPSAMPLE_FACTOR)
+
+# 3. Zentrieren für bessere Korrelation
+sig_a -= np.mean(sig_a)
+sig_b -= np.mean(sig_b)
+
+print("Calculating high-precision cross correlation...")
+corr = np.correlate(sig_a, sig_b, mode='full')
+lags = np.arange(-len(sig_b) + 1, len(sig_a))
+
+# Suchbereich einschränken (jetzt basierend auf virtueller FPS)
+max_lag_v = int(MAX_OFFSET_SECONDS * FPS_VIRTUAL)
+search_range = (lags >= -max_lag_v) & (lags <= max_lag_v)
+
+filtered_corr = corr[search_range]
+filtered_lags = lags[search_range]
+
+best_idx = np.argmax(filtered_corr)
+best_lag_v = filtered_lags[best_idx]
+
+# Der Offset berechnet sich nun aus dem virtuellen Lag und der virtuellen FPS
+best_offset_seconds = best_lag_v / FPS_VIRTUAL
+
+print("-" * 30)
+print(f"Best virtual lag: {best_lag_v} units")
+print(f"Resulting frames: {best_lag_v / UPSAMPLE_FACTOR:.3f}")
+print(f"Best offset seconds: {best_offset_seconds:.12f}")
+print("-" * 30)
+
+# Plot
+plt.figure(figsize=(12, 5))
+plt.plot(filtered_lags / FPS_VIRTUAL, filtered_corr)
+plt.axvline(best_offset_seconds, color='r', linestyle='--', label=f"Peak: {best_offset_seconds:.6f}s")
+plt.title(f"High-Precision Sync (Upsampled x{UPSAMPLE_FACTOR})")
+plt.xlabel("Offset (seconds)")
+plt.ylabel("Correlation")
+plt.legend()
+plt.grid(True)
+plt.show()
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