Update app/video_preprocess.py

app/video_preprocess.py

@@ -36,42 +36,32 @@ def _build_ffmpeg_cmd(
     input_path: str,
     output_path: str,
     *,
-    mode: str = "analysis",
+    mode: str = "preview",
     remove_audio: bool = False,
 ) -> list[str]:
-    """
-    我在这里设置了三种可选择的模式：
-    - preview:      调试/预览，体积更小
-    - analysis:     正式分析，推荐，尽量保真
-    - archival:     更高保真，体积更大
-
-    说明一下：
-    - 音频默认保留
-    - 使用 H.264 + AAC，兼容性最好
-    - 使用 CRF 控质量；CRF 越小越保真
-    """
-    mode = (mode or "analysis").lower().strip()
+    mode = (mode or "preview").lower().strip()
     if mode not in {"preview", "analysis", "archival"}:
         raise ValueError(f"不支持的预处理模式: {mode}")
 
     if mode == "preview":
-        width = 640
-        fps = 12
-        crf = 26
+        # 更适合 Hugging Face Space
+        width = 480
+        fps = 8
+        crf = 30
         preset = "veryfast"
-        audio_bitrate = "96k"
+        audio_bitrate = "64k"
     elif mode == "analysis":
+        width = 960
+        fps = 12
+        crf = 24
+        preset = "fast"
+        audio_bitrate = "96k"
+    else:
         width = 1280
         fps = 15
         crf = 18
         preset = "slow"
         audio_bitrate = "128k"
-    else:  # archival
-        width = 1280
-        fps = 20
-        crf = 16
-        preset = "slow"
-        audio_bitrate = "160k"
 
     vf = f"scale='min({width},iw)':-2,fps={fps}"
 
@@ -104,7 +94,7 @@ def _build_ffmpeg_cmd(
 def preprocess_video(
     input_path: str,
     output_dir: str,
-    mode: str = "analysis",
+    mode: str = "preview",
     remove_audio: bool = False,
 ) -> PreprocessResult:
     if not os.path.exists(input_path):
@@ -138,5 +128,4 @@ def preprocess_video(
         message=f"视频预处理完成（mode={mode}, audio={'removed' if remove_audio else 'kept'}）",
         mode=mode,
         ffmpeg_cmd=cmd,
-    )
-
+    )