feat: ltx_video dispatch in main generation loop

generation_orchestrator.py

@@ -1139,6 +1139,8 @@ def run_generation_loop(
     # ==== MAIN GENERATION LOOP ====
     print(f"\n{'='*80}\n")
 
+    _ltx_preflight_done = [False]  # Mutable cell so inner branch can set it
+
     for job_idx, job in enumerate(input_jobs):
         w, h = job["width"], job["height"]
         batch_idx = job["batch_idx"]
@@ -1255,6 +1257,48 @@ def run_generation_loop(
                     
                     existing_data["items"].pop(match_index)
             
+            # LTX Video dispatch — branches the entire per-config flow when model_type is ltx_video
+            if conf.get("model_type") == "ltx_video":
+                from .ltx_video_generation import preflight_ltx, load_ltx_models, ltx_video_generate
+
+                # Pre-flight on first LTX config of this run (idempotent — cached check internally)
+                if not _ltx_preflight_done[0]:
+                    try:
+                        preflight_ltx(conf)
+                        _ltx_preflight_done[0] = True
+                        # Free image-gen caches to make room for LTX VRAM
+                        try:
+                            from . import model_cache as mc
+                            if hasattr(mc, "clear_image_caches"):
+                                mc.clear_image_caches()
+                        except Exception:
+                            pass
+                    except RuntimeError as e:
+                        print(f"[GridTester] LTX preflight FAILED: {e}")
+                        raise
+
+                # Build the output filename (mirror existing image-gen naming convention).
+                # Use whatever the existing image-gen path uses for output_filename — there
+                # is likely a variable named output_filename or filename_base around here.
+                # If no obvious convention, build one from idx + seed.
+                ltx_output_filename = f"{conf_idx:06d}_seed{conf.get('seed', 0)}_dur{conf.get('duration_seconds', 5)}s_{conf.get('frame_rate', 25)}fps"
+                ltx_output_path = os.path.join(paths["base"], ltx_output_filename + ".mp4")
+
+                try:
+                    ltx_models = load_ltx_models(conf)
+                    gen_result = ltx_video_generate(conf, ltx_models, ltx_output_path)
+                except Exception as e:
+                    print(f"[GridTester] LTX gen FAILED for config {conf_idx}: {e}")
+                    raise
+
+                # Build manifest entry and persist
+                item = _build_ltx_manifest_entry(conf, gen_result, ltx_output_filename, gen_index=conf_idx)
+                existing_data["items"].insert(0, item)
+                save_manifest(paths["manifest"], existing_data)
+
+                # Skip the standard image-gen path
+                continue
+
             # ==== MODEL SWITCHING ====
             target_model_name = conf["model"]
             target_model_key = get_model_cache_key(conf)