refactor(config): 修改文件配置的加载

Author: FishCat233

config.json

@@ -4,7 +4,7 @@
             "name": "default",
             "x264": {
                 "crf": 23.5,
-                "preset": 8,
+                "preset": "veryslow",
                 "I": 600,
                 "r": 4,
                 "b": 3,

src/model/config.py

@@ -1,5 +1,19 @@
+from typing import Literal
+
 from pydantic import BaseModel, Field
 
+type X264Preset = Literal[
+    "ultrafast",
+    "superfast",
+    "veryfast",
+    "faster",
+    "fast",
+    "medium",
+    "slow",
+    "slower",
+    "veryslow",
+]
+
 
 class X264ConfigModel(BaseModel):
     """
@@ -11,11 +25,9 @@ class X264ConfigModel(BaseModel):
     crf: float = Field(
         default=23.5, gt=0, lt=51, description="CRF值，范围在0-51之间，值越小质量越高"
     )
-    preset: int = Field(
-        default=8,
-        gt=0,
-        lt=9,
-        description="编码预设值，范围在0-9之间，值越大编码速度越快",
+    preset: X264Preset = Field(
+        default="slower",
+        description="x264编码预设",
     )
     I: int = Field(default=600, description="关键帧间隔，影响视频的可编辑性和压缩率")
     r: int = Field(default=4, description="B帧参考数，影响视频质量和编码速度")

src/service/video.py

@@ -85,22 +85,8 @@ def process_single_file(
 
         ffmpeg_path = meta.FFMPEG_PATH
 
-        # Define preset mapping from numeric value to x264 preset string
-        preset_mapping = {
-            0: "placebo",
-            1: "veryslow",
-            2: "slower",
-            3: "slow",
-            4: "medium",
-            5: "fast",
-            6: "faster",
-            7: "veryfast",
-            8: "superfast",
-            9: "ultrafast",
-        }
-
         # Get preset string
-        preset = preset_mapping.get(config.x264.preset, "medium")
+        preset = config.x264.preset
         input_file = file.file_path
 
         if not delete_audio: