# Frequently asked questions (FAQ)

In this section we will list all the frequently asked questions we received over the years.

For our customers with a support plan package, if you have additional questions or can't find your answer here please contact our [Service Desk](https://opentelly.atlassian.net/servicedesk/customer/portal/1) for further support.

## Questions

* [How to combat autoplay policies](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-combat-autoplay-policies.md)
* [Why does fullscreen not behave as expected on iOS](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-does-fullscreen-not-behave-as-expected-on-ios.md)
* [Why does the Network API not work on iOS devices](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-does-network-api-not-work-on-ios-devices.md)
* [Why does Chromecast not work on iOS Chrome?](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-does-chromecast-not-work-on-ios-chrome.md)
* [Why can't I select another video quality on iOS/tvOS?](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-cant-we-select-other-video-quality-on-ios-tvos.md)
* [Is YouTube supported](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/is-youtube-supported.md)
* [Why does the player load only one audio track (even though there are several in the manifest)](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-does-player-load-only-one-audio-track.md)
* [Is it possible to see 360 degrees photo with THEOplayer](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/is-it-possible-to-see-360-picture.md)
* [Why the Visibility API does not work through an iframe on Safari and IE11](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-visibilty-api-doesnt-work-in-iframe-on-safari-and-ie11.md)
* [What is an impression](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-is-an-impression.md)
* [How to know whether a live stream is playing](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-know-when-livestream-is-playing.md)
* [Why did my subtitles stop working](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-did-subtitles-stop-working.md)
* [How does Media Engagement Index (MEI) affect Autoplay on Chrome](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-does-mei-affect-autoplay-on-chrome.md)
* [Why are not all response headers exposed](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-are-not-all-response-headers-exposed.md)
* [Why does the currentTime seem off in my livestream & what can I do about it](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-does-currentime-seem-to-be-off.md)
* [How to remove CORS restrictions from a reproduction stream](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-remove-cors-restrictions.md)
* [Which network calls (or requests) does THEOplayer do](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/which-network-calls-does-THEOplayer-do.md)
* [Why does the playback not work when using the Chrome iPhone/iPad simulator](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-does-playback-not-work-using-chrome-iphone-simulator.md)
* [How to remove unwanted CC track in iOS or Safari](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-remove-unwanted-cc-track-ios-safari.md)
* [MediaTek limitations](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/mediatek-limitations.md)
* [How to use ProGuard with THEOplayer Android SDK](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-use-proguard-with-android-sdk.md)
* [Self-hosting and versioning of THEOplayer](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/self-hosting-theoplayer.md)
* [Does THEOplayer support EXT-X-DATERANGE](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/does-theoplayer-support-ext-x-daterange.md)
* [Can clipping be used on a playlist](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/can-clipping-be-used-in-a-playlist.md)
* [Can timeline thumbnails be made available before playback start](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/can-timeline-thumbnails-be-made-available-before-playback-start.md)
* [What are the benefits of preloading](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-are-the-benefits-of-preloading.md)
* [What are the player seeking and seeked events and when are they fired](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-are-the-player-seeking-and-seeked-events.md)
* [Can we use HLS or DASH ads](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/can-we-use-hls-or-dash-ads.md)
* [How to change text in THEOplayer](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-change-text-in-theoplayer.md)
* [Change text when AirPlaying](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-change-text-when-airplaying.md)
* [ITP2.1 problems using THEOplayer](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/itp21-problems-using-theoplayer.md)
* [Removing context menu 'Powered by THEOplayer...'](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/removing-context-menu-powered-by.md)
* [What aspects of THEOplayer do we need to take into account to deploy a proper Content Security Policy (CSP)](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/whats-aspects-to-take-into-account-when-developing-csp.md)
* [How can we avoid that the player keeps looking for chunks/segments if they are not found](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-avoid-loading-chuncks-when-not-found.md)
* [Can we show a custom message on 403 on mp4](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/can-we-show-custom-message-on-403-on-mp4.md)
* [Can we prevent UpNext feature from redirecting](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/prevent-up-next-from-redirecting.md)
* [Is it possible to preload VOD content while the pre-roll is playing](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/preload-vod-content-when-pre-roll-is-playing.md)
* [Why is my video not playing automatically](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-is-video-not-playing-automatically.md)
* [Is it possible to have multiple player instances play at the same time](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/possible-to-have-multiple-player-instances-at-same-time.md)
* [Is it a problem if the viewer pauses a live stream for longer than the DVR window](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/is-it-a-problem-if-viewer-pauses-live-stream-longer-than-dvr-window.md)
* [THEOplayer Features & Modules](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/theoplayer-features-modules.md)
* [Chromecast on my webplayer does not work any longer despite no change in my implementation](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/chromecast-on-weblayer-does-not-longer-work.md)
* [How to track network errors](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-track-network-errors.md)
* [How to use the CDN fallback/backup stream feature](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/cdn-fallback-backup-stream-feature.md)
* [How to apply accurate buffering strategy](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-apply-accurate-buffering-strategy.md)
* [How can I distribute 4K content?](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-can-i-distribute-4k-content.md)
* [What is the collaboration between Azure Media Services and THEOplayer](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-is-the-collaboration-between-azure-media-services-and-THEOplayer.md)
* [Is Portrait mode supported](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/is-portrait-mode-supported.md)
* [How to prevent screen recording](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-prevent-screen-recording.md)
* [The provided video source is incompatible with the license for this player](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/the-provided-video-source-is-incompatible-with-the-license-for-this-player.md)
* [Page and Source domains](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/page-and-source-domains.md)
* [Why is my PlayReady stream not working in Chromium Edge?](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/Why-is-my-Playready-stream-not-working-in-Chromium-Edge.md)
* [Which subtitle and CC formats are supported on native Safari](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/which-subtitle-and-cc-formats-are-supported-on-native-safari.md)
* [How to navigate through the documentation and resources](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-navigate-through-the-documentation-and-resources.md)
* [What are the limitations of AirPlay](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-are-the-limitations-of-AirPlay.md)
* [What are the Uplynk challenges](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-are-the-uplynk-challenges.md)
* [How to use the Media Session API](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-use-media-session-api.md)
* [How to use THEOplayer iOS SDK on an M1 mac](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-use-theoplayer-ios-sdk-on-m1.md)
* [Widevine CDM deprecation notice for old browser versions](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/old-widevine-cdm-deprecation-notice.md)
* [Which source is the one being played](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/which-source-is-the-one-being-played.md)
* [What PiP options to use to make the video stay visible while browsing or on other applications](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-make-pip-video-stay-visible-while-browsing.md)
* [Why are the FairPlay license and certificate being requested again on iOS after ads?](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/why-is-DRM-license-retrieved-again-after-ads-on-iOS.md)
* [How to detect if the user changes the video quality](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-detect-if-user-changes-video-quality.md)
* [List of supported platforms](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/supported-platforms.md)

## Error handling

* [Which error related events does the player expose](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/which-error-related-events-does-player-expose.md)
* [What does the error message 'Unknown CDM error' mean](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-does-error-unknown-cdm-mean.md)
* [What does the error message 'Something went wrong with Native playback' mean](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-does-error-something-went-wrong-during-playback-mean.md)
* [What does the error message 'can only be initiated by a user gesture' imply? Can I still force the desired action](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-does-error-can-only-be-initiated-by-user-gesture-mean.md)
* [What does the error message “Something went wrong determining the initial period of the provided MPEG-DASH stream” mean](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/error-message-initial-period-provided-MPEG-DASH.md)
* [What is the "WebAssembly.compileStreaming failed" warning and what does it mean?](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-is-the-webAssembly-compileStreaming-failed-warning.md)

## Support

* [What is the support for Wowza](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/what-is-the-support-for-wowza.md)
* [How to create a (great) ticket](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-create-a-ticket.md)
* [How to investigate a ticket](https://docs-preview.optiview.dolby.com/pr-861/theoplayer/v10/faq/how-to-investigate-a-ticket.md)