fix: add speed_cfg.clamp() + comment explaining multi-stage atempo in pass-through

SpeedEngine.build_audio_filter already handles out-of-range speeds via multi-stage atempo chaining (e.g. 0.25x -> atempo=0.5,atempo=0.5). Add explicit clamp() and comment to make this clear.
2026-08-24 00:49:03 +08:00
parent b81e91e79a
commit 4f6ac9c8aa
1 changed files with 3 additions and 0 deletions
@@ -1311,12 +1311,15 @@ class UnifiedRenderService:
                af_parts.append(f"volume={clip_volume:.4f}")

            # 音频调速（与视频setpts对应，保持音画同步）
+            # SpeedEngine.build_audio_filter 内部已实现多级 atempo 串联，
+            # 自动处理超出 [0.5, 2.0] 范围的速度（如 0.25x → atempo=0.5,atempo=0.5）。
            speed = UnifiedRenderService._clip_speed(clip)
            if abs(speed - 1.0) >= 1e-6:
                try:
                    from video_processing.speed_engine import SpeedConfig, SpeedEngine

                    speed_cfg = SpeedConfig(speed=speed)
+                    speed_cfg.clamp()
                    speed_engine = SpeedEngine()
                    af_parts.append(speed_engine.build_audio_filter(speed_cfg))
                except Exception as e: