From ed8dca543e53c4fa6cb0bc48efac9a89a56df17a Mon Sep 17 00:00:00 2001
From: Jerry Yan <792602257@qq.com>
Date: Wed, 21 Jan 2026 16:12:53 +0800
Subject: [PATCH] =?UTF-8?q?fix(video):=20=E4=BF=AE=E5=A4=8D=E7=A1=AC?=
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- 将硬件下载后的格式从 nv12 改为 yuv420p
- 确保与 RGBA/YUVA 格式的 overlay 混合时颜色空间转换正确
- 解决复杂滤镜（如 lut3d, overlay, crop 等）在硬件表面的颜色显示问题
---
 handlers/base.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/handlers/base.py b/handlers/base.py
index f39247d..1a5f61b 100644
--- a/handlers/base.py
+++ b/handlers/base.py
@@ -114,6 +114,8 @@ def get_hwaccel_filter_prefix(hw_accel: str = HW_ACCEL_NONE) -> str:
     注意：由于大多数复杂滤镜（如 lut3d, overlay, crop 等）不支持硬件表面，
     我们需要在滤镜链开始时将硬件表面下载到系统内存。
 
+    使用 yuv420p 而非 nv12 格式，以确保颜色空间转换正确（特别是与 RGBA/YUVA 格式的 overlay 混合时）。
+
     Args:
         hw_accel: 硬件加速类型
 
@@ -121,9 +123,9 @@ def get_hwaccel_filter_prefix(hw_accel: str = HW_ACCEL_NONE) -> str:
         需要添加到滤镜链开头的 hwdownload 滤镜字符串
     """
     if hw_accel == HW_ACCEL_CUDA:
-        return 'hwdownload,format=nv12,'
+        return 'hwdownload,format=yuv420p,'
     elif hw_accel == HW_ACCEL_QSV:
-        return 'hwdownload,format=nv12,'
+        return 'hwdownload,format=yuv420p,'
     else:
         return ''