From 6a2678ac65ff690e24771a4c64ce96f7a9824fa4 Mon Sep 17 00:00:00 2001
From: comfyanonymous <121283862+comfyanonymous@users.noreply.github.com>
Date: Thu, 18 Dec 2025 15:22:38 -0800
Subject: [PATCH] Trim/pad channels in VAE code. (#11406)

---
 comfy/sd.py | 33 ++++++++++++++++++++++++---------
 nodes.py    |  4 ++--
 2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/comfy/sd.py b/comfy/sd.py
index f95c78892..c2a9728f3 100644
--- a/comfy/sd.py
+++ b/comfy/sd.py
@@ -321,6 +321,7 @@ class VAE:
         self.latent_channels = 4
         self.latent_dim = 2
         self.output_channels = 3
+        self.pad_channel_value = None
         self.process_input = lambda image: image * 2.0 - 1.0
         self.process_output = lambda image: torch.clamp((image + 1.0) / 2.0, min=0.0, max=1.0)
         self.working_dtypes = [torch.bfloat16, torch.float32]
@@ -435,6 +436,7 @@ class VAE:
                 self.memory_used_decode = lambda shape, dtype: (1000 * shape[2] * 2048) * model_management.dtype_size(dtype)
                 self.latent_channels = 64
                 self.output_channels = 2
+                self.pad_channel_value = "replicate"
                 self.upscale_ratio = 2048
                 self.downscale_ratio =  2048
                 self.latent_dim = 1
@@ -547,6 +549,7 @@ class VAE:
                     self.latent_dim = 3
                     self.latent_channels = 16
                     self.output_channels = sd["encoder.conv1.weight"].shape[1]
+                    self.pad_channel_value = 1.0
                     ddconfig = {"dim": dim, "z_dim": self.latent_channels, "dim_mult": [1, 2, 4, 4], "num_res_blocks": 2, "attn_scales": [], "temperal_downsample": [False, True, True], "image_channels": self.output_channels, "dropout": 0.0}
                     self.first_stage_model = comfy.ldm.wan.vae.WanVAE(**ddconfig)
                     self.working_dtypes = [torch.bfloat16, torch.float16, torch.float32]
@@ -583,6 +586,7 @@ class VAE:
                 self.memory_used_decode = lambda shape, dtype: (shape[2] * shape[3] * 87000) * model_management.dtype_size(dtype)
                 self.latent_channels = 8
                 self.output_channels = 2
+                self.pad_channel_value = "replicate"
                 self.upscale_ratio = 4096
                 self.downscale_ratio = 4096
                 self.latent_dim = 2
@@ -691,17 +695,28 @@ class VAE:
             raise RuntimeError("ERROR: VAE is invalid: None\n\nIf the VAE is from a checkpoint loader node your checkpoint does not contain a valid VAE.")
 
     def vae_encode_crop_pixels(self, pixels):
-        if not self.crop_input:
-            return pixels
+        if self.crop_input:
+            downscale_ratio = self.spacial_compression_encode()
 
-        downscale_ratio = self.spacial_compression_encode()
+            dims = pixels.shape[1:-1]
+            for d in range(len(dims)):
+                x = (dims[d] // downscale_ratio) * downscale_ratio
+                x_offset = (dims[d] % downscale_ratio) // 2
+                if x != dims[d]:
+                    pixels = pixels.narrow(d + 1, x_offset, x)
 
-        dims = pixels.shape[1:-1]
-        for d in range(len(dims)):
-            x = (dims[d] // downscale_ratio) * downscale_ratio
-            x_offset = (dims[d] % downscale_ratio) // 2
-            if x != dims[d]:
-                pixels = pixels.narrow(d + 1, x_offset, x)
+        if pixels.shape[-1] > self.output_channels:
+            pixels = pixels[..., :self.output_channels]
+        elif pixels.shape[-1] < self.output_channels:
+            if self.pad_channel_value is not None:
+                if isinstance(self.pad_channel_value, str):
+                    mode = self.pad_channel_value
+                    value = None
+                else:
+                    mode = "constant"
+                    value = self.pad_channel_value
+
+                pixels = torch.nn.functional.pad(pixels, (0, self.output_channels - pixels.shape[-1]), mode=mode, value=value)
         return pixels
 
     def decode_tiled_(self, samples, tile_x=64, tile_y=64, overlap = 16):
diff --git a/nodes.py b/nodes.py
index 3fa543294..b13ceb578 100644
--- a/nodes.py
+++ b/nodes.py
@@ -343,7 +343,7 @@ class VAEEncode:
     CATEGORY = "latent"
 
     def encode(self, vae, pixels):
-        t = vae.encode(pixels[:,:,:,:3])
+        t = vae.encode(pixels)
         return ({"samples":t}, )
 
 class VAEEncodeTiled:
@@ -361,7 +361,7 @@ class VAEEncodeTiled:
     CATEGORY = "_for_testing"
 
     def encode(self, vae, pixels, tile_size, overlap, temporal_size=64, temporal_overlap=8):
-        t = vae.encode_tiled(pixels[:,:,:,:3], tile_x=tile_size, tile_y=tile_size, overlap=overlap, tile_t=temporal_size, overlap_t=temporal_overlap)
+        t = vae.encode_tiled(pixels, tile_x=tile_size, tile_y=tile_size, overlap=overlap, tile_t=temporal_size, overlap_t=temporal_overlap)
         return ({"samples": t}, )
 
 class VAEEncodeForInpaint: