Fix blnak live stream

counter_dashboard.py

@@ -56,6 +56,12 @@ def api_live_video():
             try:
                 with open(LIVE_STREAM_FRAME_PATH, "rb") as f:
                     jpeg = f.read()
+                if not jpeg or len(jpeg) < 2 or jpeg[:2] != b"\xff\xd8":
+                    consecutive_fails += 1
+                    if consecutive_fails >= MAX_FAILS:
+                        return
+                    time.sleep(0.05)
+                    continue
                 consecutive_fails = 0
                 yield (b"--frame\r\n"
                        b"Content-Type: image/jpeg\r\n\r\n" + jpeg + b"\r\n")