process_videos: fix FPS handling in image pre-processing

Author: matanby

scripts/process_videos.py

@@ -126,7 +126,7 @@ def __getitem__(self, index: int) -> dict[str, Any]:
 
         if video_path.suffix.lower() in [".png", ".jpg", ".jpeg"]:
             video = self._preprocess_image(video_path)
-            fps = -1
+            fps = 1
         else:
             video, fps = self._preprocess_video(video_path)
 

src/ltxv_trainer/ltxv_utils.py

@@ -202,11 +202,11 @@ def get_rope_scale_factors(fps: float) -> list[float]:
     if fps <= 0:
         raise ValueError("FPS must be a positive number.")
 
-    latent_frame_rate = fps / 8.0  # Temporal compression ratio
-    spatial_compression_ratio = 32.0  # Spatial compression ratio
+    temporal_compression_ratio = 8.0
+    spatial_compression_ratio = 32.0
 
     return [
-        1.0 / latent_frame_rate,
+        temporal_compression_ratio / fps,
         spatial_compression_ratio,
         spatial_compression_ratio,
     ]