[Single File] Fix loading for LTX 0.9.7 transformer (#11578)

update

Author: DN6

src/diffusers/loaders/single_file_utils.py

@@ -179,6 +179,7 @@
     "ltx-video": {"pretrained_model_name_or_path": "diffusers/LTX-Video-0.9.0"},
     "ltx-video-0.9.1": {"pretrained_model_name_or_path": "diffusers/LTX-Video-0.9.1"},
     "ltx-video-0.9.5": {"pretrained_model_name_or_path": "Lightricks/LTX-Video-0.9.5"},
+    "ltx-video-0.9.7": {"pretrained_model_name_or_path": "Lightricks/LTX-Video-0.9.7-dev"},
     "autoencoder-dc-f128c512": {"pretrained_model_name_or_path": "mit-han-lab/dc-ae-f128c512-mix-1.0-diffusers"},
     "autoencoder-dc-f64c128": {"pretrained_model_name_or_path": "mit-han-lab/dc-ae-f64c128-mix-1.0-diffusers"},
     "autoencoder-dc-f32c32": {"pretrained_model_name_or_path": "mit-han-lab/dc-ae-f32c32-mix-1.0-diffusers"},
@@ -644,7 +645,10 @@ def infer_diffusers_model_type(checkpoint):
             model_type = "flux-schnell"
 
     elif any(key in checkpoint for key in CHECKPOINT_KEY_NAMES["ltx-video"]):
-        if checkpoint["vae.encoder.conv_out.conv.weight"].shape[1] == 2048:
+        has_vae = "vae.encoder.conv_in.conv.bias" in checkpoint
+        if any(key.endswith("transformer_blocks.47.scale_shift_table") for key in checkpoint):
+            model_type = "ltx-video-0.9.7"
+        elif has_vae and checkpoint["vae.encoder.conv_out.conv.weight"].shape[1] == 2048:
             model_type = "ltx-video-0.9.5"
         elif "vae.decoder.last_time_embedder.timestep_embedder.linear_1.weight" in checkpoint:
             model_type = "ltx-video-0.9.1"