# Known Issues & Workarounds in the IVS Web Player SDK
<a name="web-issues"></a>

This document lists known issues that you might encounter when using the Amazon IVS Web player SDK and suggests potential workarounds.
+ When playing recorded content (also known as VOD) on an iOS mobile browser (e.g. Safari or Chrome), seeking backwards will mute the player.

  **Workaround:** Call `player.setMuted(false)` after seeking.
+ When playing recorded content on an iOS mobile browser, seeking backwards works intermittently when directly selecting the desired position.

  **Workaround:** Drag the seek bar to the desired position.
+ When playing recorded content on an iOS mobile browser, `player.seekTo()` calls do not consistently work.

  **Workaround:** Set `currentTime` on the video HTML element after the `loadeddata` event. For example:

  ```
  videoEl.addEventListener('loadeddata', () => {
  	videoEl.currentTime = 30; // seek 30s from the beginning
  });
  ```
+ When playing a live stream or recorded content on an iOS mobile browser, captions may not be rendered in different sizes and may be re-rendered multiple times.

  **Workaround:** None.
+ When playing a live stream or recorded content on an iOS mobile browser, `player.getQualities()` calls do not return the list of available qualities.

  **Workaround:** None. The player supports only auto-quality mode on iOS browsers.
+ When native HTML5 controls are enabled, calls to `setQuality()` are ignored.

  **Workaround:** Disable HTML5 controls before calling `player.setQuality()`.
+ When playing a muted live stream on an iOS mobile browser, player instability (e.g., black or frozen screen, buffering) may be seen when resuming an inactive player tab (e.g., tab switches or device lock/unlock).

  **Workaround:** Use the JavaScript [Page Visibility API](https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API) to detect page visibility changes and then take action on the player accordingly. For example:

  ```
  //if client platform is iOS
  if (!!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)) {
      document.addEventListener(“visibilitychange”, () => {
          if (document.visibilityState === “hidden” && player.isMuted()) {
              player.pause()
          if (document.visibilityState === “visible” &&
              player.getState() != PlayerState.PLAYING) {
              player.play()
          }
      })
  }
  ```
+ When using the Web player SDK on iOS Safari, playback authorization will not work without a service worker due to limited iOS support for Media Source Extensions (MSE).

  **Workaround:** Implement a service worker with the Player SDK. See [Set Up Service Worker](web-getting-started.md#web-service-worker) and this [demo](https://github.com/aws-samples/amazon-ivs-player-web-sample/blob/master/samples/service-worker/service-worker.ts).