diff --git a/configs/vae/train/video.py b/configs/vae/train/video.py
index dea41e5..8dd96c2 100644
--- a/configs/vae/train/video.py
+++ b/configs/vae/train/video.py
@@ -1,4 +1,4 @@
-num_frames = 17
+num_frames = 33
 image_size = (256, 256)
 
 # Define dataset
diff --git a/opensora/models/vae/vae_temporal.py b/opensora/models/vae/vae_temporal.py
index 473d057..bdf336f 100644
--- a/opensora/models/vae/vae_temporal.py
+++ b/opensora/models/vae/vae_temporal.py
@@ -382,7 +382,7 @@ class VAE_Temporal(nn.Module):
         return latent_size
 
     def encode(self, x):
-        time_padding = self.time_downsample_factor - x.shape[2] % self.time_downsample_factor
+        time_padding = 0 if (x.shape[2] % self.time_downsample_factor == 0) else  self.time_downsample_factor - x.shape[2] % self.time_downsample_factor
         x = pad_at_dim(x, (time_padding, 0), dim=2)
         encoded_feature = self.encoder(x)
         moments = self.quant_conv(encoded_feature).to(x.dtype)
@@ -390,7 +390,7 @@ class VAE_Temporal(nn.Module):
         return posterior
 
     def decode(self, z, num_frames=None):
-        time_padding = self.time_downsample_factor - num_frames % self.time_downsample_factor
+        time_padding = 0 if (num_frames % self.time_downsample_factor == 0) else self.time_downsample_factor - num_frames % self.time_downsample_factor
         z = self.post_quant_conv(z)
         x = self.decoder(z)
         x = x[:, :, time_padding:]
diff --git a/scripts/inference-vae-chunked-enc.py b/scripts/inference-vae-chunked-enc.py
new file mode 100644
index 0000000..9192e60
--- /dev/null
+++ b/scripts/inference-vae-chunked-enc.py
@@ -0,0 +1,134 @@
+import os
+
+import colossalai
+import torch
+import torch.distributed as dist
+from colossalai.cluster import DistCoordinator
+from mmengine.runner import set_random_seed
+from tqdm import tqdm
+
+from opensora.acceleration.parallel_states import get_data_parallel_group
+from opensora.datasets import prepare_dataloader, save_sample
+from opensora.models.vae.losses import VAELoss
+from opensora.registry import DATASETS, MODELS, build_module
+from opensora.utils.config_utils import parse_configs
+from opensora.utils.misc import to_torch_dtype
+
+
+def main():
+    # ======================================================
+    # 1. cfg and init distributed env
+    # ======================================================
+    cfg = parse_configs(training=False)
+    print(cfg)
+
+    # init distributed
+    if os.environ.get("WORLD_SIZE", None):
+        use_dist = True
+        colossalai.launch_from_torch({})
+        coordinator = DistCoordinator()
+    else:
+        use_dist = False
+
+    # ======================================================
+    # 2. runtime variables
+    # ======================================================
+    torch.set_grad_enabled(False)
+    torch.backends.cuda.matmul.allow_tf32 = True
+    torch.backends.cudnn.allow_tf32 = True
+    device = "cuda" if torch.cuda.is_available() else "cpu"
+    dtype = to_torch_dtype(cfg.dtype)
+    set_random_seed(seed=cfg.seed)
+
+    # ======================================================
+    # 3. build dataset and dataloader
+    # ======================================================
+    dataset = build_module(cfg.dataset, DATASETS)
+    dataloader = prepare_dataloader(
+        dataset,
+        batch_size=cfg.batch_size,
+        num_workers=cfg.num_workers,
+        shuffle=False,
+        drop_last=True,
+        pin_memory=True,
+        process_group=get_data_parallel_group(),
+    )
+    print(f"Dataset contains {len(dataset):,} videos ({cfg.dataset.data_path})")
+    total_batch_size = cfg.batch_size * dist.get_world_size()
+    print(f"Total batch size: {total_batch_size}")
+
+    # ======================================================
+    # 4. build model & load weights
+    # ======================================================
+    # 4.1. build model
+    model = build_module(cfg.model, MODELS)
+    model.to(device, dtype).eval()
+
+    # ======================================================
+    # 5. inference
+    # ======================================================
+    save_dir = cfg.save_dir
+
+    # define loss function
+    vae_loss_fn = VAELoss(
+        logvar_init=cfg.get("logvar_init", 0.0),
+        perceptual_loss_weight=cfg.perceptual_loss_weight,
+        kl_loss_weight=cfg.kl_loss_weight,
+        device=device,
+        dtype=dtype,
+    )
+
+    # get total number of steps
+    total_steps = len(dataloader)
+    if cfg.max_test_samples is not None:
+        total_steps = min(int(cfg.max_test_samples // cfg.batch_size), total_steps)
+        print(f"limiting test dataset to {int(cfg.max_test_samples//cfg.batch_size) * cfg.batch_size}")
+    dataloader_iter = iter(dataloader)
+
+    running_loss = running_nll = running_nll_z = 0.0
+    loss_steps = 0
+    with tqdm(
+        range(total_steps),
+        disable=not coordinator.is_master(),
+        total=total_steps,
+        initial=0,
+    ) as pbar:
+        for step in pbar:
+            batch = next(dataloader_iter)
+            x = batch["video"].to(device, dtype)  # [B, C, T, H, W]
+            input_size = x.shape[2:]
+
+            half_frame = int(x.size(2) // 2)
+            x_front = x[:,:, :half_frame, :, :]
+            x_back = x[:, :, half_frame:, :, :]
+
+            #  ===== VAE =====
+            z_front, posterior_front, x_z_front = model.encode(x_front)
+            z_back, posterior_back, x_z_back = model.encode(x_back)
+
+            dummy, _, _ = model.encode(x)
+            latent_size = list(dummy.shape)
+
+            z = torch.cat((z_front, z_back), dim=2)
+            x_z = torch.cat((x_z_front, x_z_back), dim=2)
+            assert list(z.shape) == latent_size, f"z shape: {z.shape}, latent_size: {latent_size}"
+            x_rec, x_z_rec = model.decode(z, num_frames=x.size(2))
+            x_ref = model.spatial_vae.decode(x_z)
+
+            if not use_dist or coordinator.is_master():
+                ori_dir = f"{save_dir}_ori"
+                rec_dir = f"{save_dir}_rec"
+                ref_dir = f"{save_dir}_ref"
+                os.makedirs(ori_dir, exist_ok=True)
+                os.makedirs(rec_dir, exist_ok=True)
+                os.makedirs(ref_dir, exist_ok=True)
+                for idx, vid in enumerate(x):
+                    pos = step * cfg.batch_size + idx
+                    save_sample(vid, fps=cfg.fps, save_path=f"{ori_dir}/{pos:03d}")
+                    save_sample(x_rec[idx], fps=cfg.fps, save_path=f"{rec_dir}/{pos:03d}")
+                    save_sample(x_ref[idx], fps=cfg.fps, save_path=f"{ref_dir}/{pos:03d}")
+
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/train-vae.py b/scripts/train-vae.py
index 60400d7..43fecaa 100644
--- a/scripts/train-vae.py
+++ b/scripts/train-vae.py
@@ -231,8 +231,10 @@ def main():
         ) as pbar:
             for step, batch in pbar:
                 x = batch["video"].to(device, dtype)  # [B, C, T, H, W]
-                if random.random() < cfg.get("mixed_image_ratio", 0.0):
-                    x = x[:, :, :1, :, :]
+                # if random.random() < cfg.get("mixed_image_ratio", 0.0):
+                #     x = x[:, :, :1, :, :]
+                length = random.randint(1, x.size(2))
+                x = x[:, :, :length, :, :]
 
                 #  ===== VAE =====
                 x_rec, x_z_rec, z, posterior, x_z = model(x)