IntroductionHow to update an SDK?THEOplayer 5.0 - Native Mobile iOS/tvOS and Android SDKs
Getting started on Web (Extended)Getting started with the new Web UIGetting started on WebAPI examplesHow to implement Keyboard HotkeysHow to embed an iframeHow to implement a seamless transition between videos?How to work around browser cache with new THEOplayer SDK libraries?How to customise quality selection & labels (MP4)How to get frame-accurate currentTime display in the UI Control barHow to play an LCEVC source with THEOplayerHow to use WebXR with THEOplayerHow to use THEOplayer as a JavaScript module
Android legacy (4.12.x)
Getting started on Legacy Android SDK (4.12.x)Legacy Android SDK (4.12.x) customizationHow to couple the native MediaRouteButton to THEOplayerHow to enable experimental native rendering on AndroidHow to do offline Playback with AES-128 Encrypted Streams on Android
Getting started with the Android UIGetting started on AndroidAndroid Feature IntegrationsMigration from THEOplayer Android/AndroidTV/FireTV SDK 4.x to THEOplayer Android SDK 5.0
iOS legacy (4.12.x)
Getting started on iOSiOS/tvOS SDK and Legacy iOS/tvOS SDK (4.12.x) CustomizationMy app does not want to build for the app storeHow to bypass copy() not working in Safari consoleHow to couple the native GCKUICastButton to THEOplayeriOS/tvOS SDK and Legacy iOS/tvOS SDK (4.12.x) Touch-events (gestures)Building for iOS Simulator, but the linked and embedded framework THEOplayerSDK.framework was built for iOS + iOS SimulatorHow to implement custom local network access (LNA) interstitial dialog for Chromecast
Getting started guide for THEOplayer iOS/tvOS SDK 5.0THEOplayer iOS/tvOS 5.0 Feature IntegrationsMigration from THEOplayer iOS and tvOS SDK 4.x to THEOplayer iOS/tvOS SDK 5.0+
Android TV Legacy (4.12.x)
Getting started on Android TV Legacy (4.12.x)
Getting started on tvOS
Getting started on ChromecastChromecast Application Customization
Getting Started on webOS
Getting started on TizenInstalling the Tizen developer toolsSetting up a Tizen device for debuggingDeploying a test app on a physical Tizen deviceDeploying a test app on a Tizen emulator
Getting Started on Roku
Fire TV Legacy (4.12.x)
Getting started on Fire TV Legacy (4.12.x)

How to implement a seamless transition between videos?

You may need an answer to this question if you want to play one video after the other without letting the user know the source has changed (to the user they will seem as if playing just one video). Similar questions may be:

  • Is it possible to make 2 video files play one after the other without pause?
  • How can I play a second video file after the first without the user notice what happened?
  • How to make a forking video, one where the user can choose his/her own path?

This result is achieved taking advantage of a HTML5 canvas element to cover the source change. An example can be seen on this page.

You can find the code of the page here below, opportunely commented to clarify how it works (hint: all interesting comments start with "COMMENT:" to aid the search).

Seamless video transitionExpand source

<!doctype html>
<html lang="en">
    <meta charset="utf-8" />
      content="width=device-width, initial-scale=1, shrink-to-fit=no"
    <meta http-equiv="x-ua-compatible" content="ie=edge" />

    <title>Seamless video transition</title>


      canvas {
        width: 100%;
        height: 100%;
        position: absolute;
        display: none;
      button {
        margin: 1em 0;
    <h1>Seamless video transition</h1>
    <div class="container">
      <div id="theoplayer-wrapper">
        <div class="video-js theoplayer-skin">
          <!-- COMMENT: a canvas element is set inside the THEOplayer wrapper. Initial sizes are set but will be reset when the canvas is called -->
          <canvas width="503px" height="283px"> </canvas>
        <button id="sourcechange-btn">Change video</button>

    <script type="text/javascript">
      var element = document.querySelector(".video-js")

      // COMMENT: some player configuration here - interesting but nothing related to this example
      var player = new THEOplayer.Player(element, {
        ui: {
          //fluid: true
          width: "800",
          height: "450",
        libraryLocation: "//cdn.theoplayer.com/dash/theoplayer/",
      player.autoplay = true
      player.source = {

      //COMMENT: objective: hide the transition between 2 videos.
      // To do this, we:
      // - detect when the source must be changed
      // - save the last frame in the canvas poster that is placed on top of the player
      // - we load the new source
      // - when playback starts, the canvas is hidden

      // COMMENT: this detects the first play event and calls the function firstplay()
      player.addEventListener("sourcechange", function () {
        //console.log("A new SourceDescription has been set.");
        player.removeEventListener("playing", firstplay)
        player.addEventListener("playing", firstplay)

      // COMMENT: on click we call writeToCanvas() and change the player source after a small delay (time is needed for the canvas content to be loaded)
      var button = document.querySelector("#sourcechange-btn")
      button.addEventListener("click", () => {
        setTimeout(function () {
          player.src =
        }, 50)

      // COMMENT: canvas is hidden when the first play event is fired
      function firstplay(event) {
        var canvas = document.querySelector("canvas")
        player.removeEventListener("playing", firstplay)
        //console.log("first play event!", event);
        canvas.style.display = "none"

      // COMMENT:
      // (1) Canvas is detected, its sizes adapted to those of the player and it gets the last frame as content.
      // (2) It is displayed as block (as opposed to the initial "none")
      function writeToCanvas() {
        var canvas = document.querySelector("canvas")
        canvas.setAttribute("width", player.videoWidth + "px")
        canvas.setAttribute("height", player.videoHeight + "px")
        var ctx = canvas.getContext("2d")
        canvas.style.display = "block"
        player.canvas.drawImage(ctx, 0, 0)

The result on your page can also be improved implementing cache for your videos.

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