Give the 720p HunyuanVideo repack its own family and free offload hooks on cancel

The trusted-repo allowlist admitted the 720p t2v repack while the only
Hunyuan family entry carried 480p presets, so a 720p load silently
defaulted to 832x480. It now resolves a dedicated entry whose repo-id
alias outranks the generic token (same guider config, verified: both
repos ship guidance 6.0).

A scheduler-wrapped cancel unwinds pipe call by exception and skips the
pipeline's end-of-call maybe_free_model_hooks, leaving onloaded offload
modules on the GPU until the next request; generate() now frees them
before surfacing the cancelled sentinel.

studio/backend/core/inference/video.py

@@ -1238,6 +1238,17 @@ class VideoBackend:
                     with torch.inference_mode(), progress_ctx:
                         output = pipe(**kwargs)
                 except _VideoGenerationCancelled:
+                    # This cancel unwinds pipe.__call__ by exception (the scheduler
+                    # wrapper has no cooperative _interrupt), skipping the pipeline's
+                    # end-of-call maybe_free_model_hooks(); under model/group offload
+                    # the currently-onloaded modules would otherwise stay on the GPU
+                    # until the next request touches them.
+                    free_hooks = getattr(pipe, "maybe_free_model_hooks", None)
+                    if callable(free_hooks):
+                        try:
+                            free_hooks()
+                        except Exception:  # noqa: BLE001 -- cleanup is best-effort
+                            pass
                     raise RuntimeError(VIDEO_CANCELLED_MSG) from None
                 if cancel.is_set():
                     raise RuntimeError(VIDEO_CANCELLED_MSG)

studio/backend/core/inference/video_families.py

@@ -237,6 +237,30 @@ _FAMILIES: tuple[VideoFamily, ...] = (
         # VAE (4.7 -> 2.4); the Qwen2.5-VL TE is stored bf16 (14.0) plus ByT5 0.8.
         bf16_components_gb = (16.6, 14.8, 2.4),
     ),
+    # The 720p t2v repack: same architecture, pipeline quirks, guider config
+    # (guidance 6.0) and shard footprint as the 480p entry above; only the
+    # trained resolution class differs. Kept as its OWN family so a 720p load
+    # defaults to 720p-class sizes instead of silently rendering at 832x480.
+    # The repo-id alias is the full path segment, so it out-lengths (and thus
+    # outranks) the generic "hunyuanvideo-1.5" token for this repo only.
+    VideoFamily(
+        name = "hunyuanvideo-1.5-720p",
+        pipeline_class = "HunyuanVideo15Pipeline",
+        transformer_class = "HunyuanVideo15Transformer3DModel",
+        base_repo = "hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-720p_t2v",
+        aliases = ("hunyuanvideo-1.5-diffusers-720p_t2v", "hv15-720p"),
+        has_audio = False,
+        guidance_via_guider = True,
+        default_steps = 50,
+        default_guidance = 6.0,
+        default_num_frames = 121,
+        default_fps = 24,
+        frame_step = 4,
+        resolution_multiple = 16,
+        # 720p-class presets: landscape, vertical, square (all /16).
+        resolution_presets = ((1280, 720), (720, 1280), (960, 960)),
+        bf16_components_gb = (16.6, 14.8, 2.4),
+    ),
 )
 
 

studio/backend/tests/test_video_backend.py

@@ -303,6 +303,10 @@ class _FakeHV15Pipe:
         self.components = {"transformer": self.transformer, "vae": self.vae}
         self.moved_to = None
         self.last_kwargs = None
+        self.hooks_freed = 0
+
+    def maybe_free_model_hooks(self):
+        self.hooks_freed += 1
 
     def to(self, device):
         self.moved_to = device
@@ -718,6 +722,10 @@ def test_hv15_cancel_unwinds_scheduler_loop(fake_runtime):
     assert pipe.scheduler.calls == 1
     # The wrapper must restore scheduler.step even on the exception path.
     assert pipe.scheduler.step.__func__ is _FakeHV15Scheduler.step
+    # The exception unwound pipe.__call__ before its own end-of-call cleanup, so
+    # generate() must have freed the offload hooks itself (VRAM would otherwise
+    # stay onloaded until the next request).
+    assert pipe.hooks_freed == 1
 
 
 def test_singleton():
@@ -1129,3 +1137,18 @@ def test_base_download_files_ltx23_keeps_only_shared_components():
     assert not any(
         n.startswith(("vae/", "connectors/", "latent_upsampler/", "transformer/")) for n in names
     )
+
+
+def test_hv15_720p_repo_gets_720p_family_defaults():
+    # The 720p repack is trusted, but it must resolve its OWN family entry: the
+    # generic hunyuanvideo-1.5 entry would default generation to 832x480.
+    from core.inference.video_families import detect_video_family
+
+    fam = detect_video_family("hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-720p_t2v")
+    assert fam is not None and fam.name == "hunyuanvideo-1.5-720p"
+    assert fam.resolution_presets[0] == (1280, 720)
+    assert fam.base_repo.endswith("720p_t2v")
+    # The 480p repo keeps the original entry.
+    fam480 = detect_video_family("hunyuanvideo-community/HunyuanVideo-1.5-Diffusers-480p_t2v")
+    assert fam480 is not None and fam480.name == "hunyuanvideo-1.5"
+    assert fam480.resolution_presets[0] == (832, 480)

studio/backend/tests/test_video_families.py

@@ -151,6 +151,7 @@ def test_supported_names():
         "wan2.2-ti2v-5b",
         "wan2.2-t2v-a14b",
         "hunyuanvideo-1.5",
+        "hunyuanvideo-1.5-720p",
     )