Update app.py

app.py

@@ -80,18 +80,33 @@ VIDEO_CONFIG = {
 def detect_hw_encoder():
     try:
         result = subprocess.run(["ffmpeg", "-encoders"], capture_output=True, text=True)
+        
+        candidates = []
         if 'h264_videotoolbox' in result.stdout:
-            logger.info("✅ GPU encoder: h264_videotoolbox")
-            return 'h264_videotoolbox', '65'
+            candidates.append(('h264_videotoolbox', '65'))
         if 'h264_nvenc' in result.stdout:
-            logger.info("✅ GPU encoder: h264_nvenc")
-            return 'h264_nvenc', '23'
+            candidates.append(('h264_nvenc', '23'))
         if 'h264_qsv' in result.stdout:
-            logger.info("✅ GPU encoder: h264_qsv")
-            return 'h264_qsv', '23'
+            candidates.append(('h264_qsv', '23'))
+        
+        # Test each encoder with a tiny encode
+        for encoder, quality in candidates:
+            try:
+                test = subprocess.run([
+                    "ffmpeg", "-f", "lavfi", "-i", "color=c=black:s=16x16:d=0.1",
+                    "-c:v", encoder, "-q:v", quality,
+                    "-f", "null", "-"
+                ], capture_output=True, text=True, timeout=5)
+                if test.returncode == 0:
+                    logger.info(f"✅ GPU encoder verified: {encoder}")
+                    return encoder, quality
+                else:
+                    logger.warning(f"⚠️ {encoder} listed but failed test encode")
+            except:
+                logger.warning(f"⚠️ {encoder} test timed out")
     except:
         pass
-    logger.warning("ℹ️ No GPU encoder — using libx264")
+    logger.info("ℹ️ No working GPU encoder — using libx264")
     return None, None
 
 _hw_encoder, _hw_quality = detect_hw_encoder()