feat: add video xcorr lab with gray proxy support

config.toml

@@ -12,6 +12,10 @@ start = 0.0
 out_dir = "extracted"
 target_fps = "24000/1001"   # Blu-ray film 23.976
 target_fps_eps = 0.02
+# Lossless gray analysis proxy ({stem}_proxy.mkv), built from the LOCAL master
+# (never re-reads the originals). Used by sync_video_test.py for fast decode.
+proxy = true
+proxy_width = 192
 
 [audio]
 # Target for re-encode / load. Must be identical for both files.
@@ -35,3 +39,14 @@ volume = 70             # the default volume in ast
 method = "phat"   # "phat" (GCC-PHAT, robust) or "standard" (raw)
 use_gpu = "auto"  # "auto" | "cpu" | "cuda" (ROCm/CUDA both via torch.cuda)
 out_dir = "output"  # synced output folder
+
+[video]
+# Settings for sync_video_test.py (reads ONLY files inside extract.out_dir).
+grid = "32x18"     # correlation grid WxH (16x9, 24x14, 32x18, 48x27, 64x36)
+bars = true        # auto-crop static letterbox/pillarbox bars before scaling
+max_lag = 0.0      # search half-window in seconds (0 = full range)
+prefer_proxy = true  # use {stem}_proxy.mkv when present, else {stem}_video.mkv
+decode_width = 192   # decode scale width when reading the full master
+# Explicit extracted files (optional, relative to repo root or absolute):
+# file_a_mkv = "extracted/movie_b_proxy.mkv"
+# file_b_mkv = "extracted/movie_a_proxy.mkv"