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layout default-layout
title How to get rid of the delay when opening the camera?
keywords Dynamsoft Barcode Reader, FAQ, delay,camera,loadwasm
description How to get rid of the delay when opening the camera?
needAutoGenerateSidebar false

How to get rid of the delay when opening the camera?

<< Back to FAQ index

1. Invoke loadWasm in advance

Dynamsoft.DBR.BarcodeReader.loadWasm();

2. Pre-open the camera in advance

Run the following code before calling createInstance.

navigator.mediaDevices.getUserMedia({video: true}).then(mediaStream=>{
  mediaStream.getTracks().forEach((track) => {
    track.stop();
  });
}, err=>{});

3. Skip Camera inspection(use default camera)

scanner.ifSkipCameraInspection = true;