Bound per-input decoder and scene detection threads

lib/video-canvas/smart-edit/render.ts

@@ -88,7 +88,7 @@ export async function renderEditPlan(
       audio = `a${i}`;
     }
     await ffmpeg([
-      ...normalized.flatMap((file) => ["-i", file]),
+      ...normalized.flatMap((file) => ["-threads", "2", "-i", file]),
       "-filter_complex",
       filters.join(";"),
       "-map",

services/smart-edit/analyze.py

@@ -41,6 +41,8 @@ def analyze(data):
     result={'scenes':[], 'active':[], 'subtitles':[], 'beats':[], 'warnings':[]}
     duration=data.get('duration',0)
     if data.get('video'):
+        import cv2
+        cv2.setNumThreads(2)
         from scenedetect import detect,AdaptiveDetector
         result['scenes']=[[round(a.get_seconds()*1e6),round(b.get_seconds()*1e6)] for a,b in detect(data['video'],AdaptiveDetector(min_scene_len=15),start_in_scene=True)] or [[0,duration]]
     if data.get('audio'):