Player

The Player component provides an easy way to display video or audio.

It automatically handles different source types from a Livepeer provider, such as WebRTC, MP4, and HLS. These are seamlessly integrated so that playback has low latency under all network conditions.

​

Usage

import { Player } from '@livepeer/react';

import { Player } from '@livepeer/react';
import Image from 'next/image';

import blenderPoster from '../../../public/images/blender-poster.png';

const PosterImage = () => {
  return (
    <Image
      src={blenderPoster}
      layout="fill"
      objectFit="cover"
      priority
      placeholder="blur"
    />
  );
};

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster={<PosterImage />}
      showPipButton
      objectFit="cover"
      priority
    />
  );
};

import { Player } from '@livepeer/react';

import { Player } from '@livepeer/react';
import Image from 'next/image';

import blenderPoster from '../../../public/images/blender-poster.png';

const PosterImage = () => {
  return (
    <Image
      src={blenderPoster}
      layout="fill"
      objectFit="cover"
      priority
      placeholder="blur"
    />
  );
};

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster={<PosterImage />}
      showPipButton
      objectFit="cover"
      priority
    />
  );
};

import { Player } from '@livepeer/react-native';

import { Player } from '@livepeer/react-native';

import blenderPoster from './assets/images/blender-poster.png';

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster={blenderPoster}
    />
  );
};

​

Compatibility

​

Configuration

​

playbackId or src

A playbackId for an asset or Stream, or src, a media source URL. One of these is required.

​

playbackId

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
    />
  );
}

The playbackId passed to the Player can be either a short playback ID which is created on asset/stream creation, or, for an asset, an IPFS CID. If the provided IPFS CID or IPFS/Arweave URL has not been uploaded yet, it can be auto-uploaded and played back - see autoUrlUpload for more details.

// only after the asset has been persisted to IPFS
// equivalent to the above example
function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="bafybeida3w2w7fch2fy6rfvfttqamlcyxgd3ddbf4u25n7fxzvyvcaegxy"
    />
  );
}

​

src

The Player also supports an arbitrary src URL which can correspond to any common video or audio which most browsers support. See caniuse video format for more details on browser support.

If the src is an IPFS/Arweave URL, it can be auto-uploaded and played back - see autoUrlUpload for more details.

const src =
  "https://ipfs.livepeer.studio/ipfs/QmURv3J5BGsz23GaCUm7oXncm2M9SCj8RQDuFPGzAFSJw8";

function PlayerComponent() {
  return <Player src={src} />;
}

​

jwt or accessKey

​

jwt

The JSON Web Token (JWT) used to access media gated by a jwt playback policy. Alternatively, accessKey can be used for a webhook playback policy. See the Access Control example for more details.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      jwt={jwt}
    />
  );
}

​

accessKey

The access key used to access media behind a webhook playback policy. Alternatively, onAccessKeyRequest can be used to return this access key in a callback. See the Access Control example for more details.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      accessKey="access-key"
    />
  );
}

​

onAccessKeyRequest

A callback which returns the access key used to gate access to media. Similar to accessKey above, this is used to gate content based on a webhook playback policy. This is used instead of the accessKey prop, and can be asynchronous and accepts any Promise or simple callback which returns a string. See the Access Control example for more details.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      onAccessKeyRequest={async () => {
        return "access-key";
      }}
    />
  );
}

​

priority

When true, the media will be considered high priority and preload. Lazy loading is automatically disabled for media using priority. You should use the priority property on any media detected as the Largest Contentful Paint (LCP) element. It may be appropriate to have multiple, as different content may be the LCP element for different viewport sizes.

Should only be used when the media is visible above the fold. Defaults to false.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      priority
    />
  );
}

​

lowLatency

When enabled, the Player will play back live streams with low-latency WebRTC. Defaults to true. If this does not succeed in playing back (commonly due to a slow network or connectivity issues), the Player will automatically fall back to HLS playback. Also, if the stream contains B-frames (bidirectional frames, which are common for users streaming with OBS or other streaming apps), the Player will automatically switch to HLS, so that out-of-order frames are not displayed.

This only applies to video elements which are playing back livestreams - assets will play back with MP4 or HLS.

You may also specify "force", which forces WebRTC and disables fallback to HLS. This is not a recommended default unless your application requires low latency (and should not play if low latency is not available), due to the possible connectivity issues which WebRTC can face, which HLS is not subject to.

function PlayerComponent() {
  return (
    <Player
      title="My Livestream"
      playbackId="wwl88k4g8f5eese9"
      lowLatency="force"
    />
  );
}

​

clipLength

The clip length enables the “live clipping” feature - the value is in seconds, and controls the length of the clip that is created when the clip button is clicked by a viewer. This can be one of 90, 60, 45, 30, 15, or 10 seconds.

This allows for dynamic viewing experiences, along with the onClipStarted, onClipCreated, and onClipError callbacks for clips.

function PlayerComponent() {
  return (
    <Player
      title="Live Stream"
      playbackId="terese9wwl88k4g8"
      clipLength={30}
      onClipStarted={() => {
        console.log("Clip API request is pending...");
      }}
      onClipCreated={(asset: Asset) => {
        // poll the status of the asset for the
        // download URL or playback ID
        console.log(asset.id);
      }}
      onClipError={(error: Error) => {
        console.error(error.message);
      }}
    />
  );
}

​

playRecording

When allowed, the Player will include recording URLs in playback. This is the HLS URL that allows users to watch the entire recording of a stream, without requiring the user to play from the latest playhead (as is usually required in stream playback). This can be used to create historical clipping experiences for streams - users can watch a version of the stream that constantly appended with the latest segments.

function PlayerComponent() {
  return (
    <Player title="Live Stream" playbackId="terese9wwl88k4g8" playRecording />
  );
}

​

title

The title for the content. This is highly recommended, since it is used for accessibility labels in the Player. If you do not want to show the title visually, see showTitle.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
    />
  );
}

​

showTitle

Enables/disables the title component.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      showTitle={false}
    />
  );
}

​

aspectRatio

Sets the aspect ratio for the content. Highly recommended for a great viewing experience (for more information, see Cumulative Layout Shift). Defaults to 16to9.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      aspectRatio="1to1"
    />
  );
}

​

loop

Sets whether the content will loop when finished. Defaults to false.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      loop
    />
  );
}

​

poster

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster="/images/blender-poster.png"
    />
  );
}

import { Player } from "@livepeer/react";
import Image from "next/image";

import blenderPoster from "./images/blender-poster.png";

const PosterImage = () => {
  return (
    <Image
      src={blenderPoster}
      layout="fill"
      objectFit="cover"
      placeholder="blur"
    />
  );
};

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster={<PosterImage />}
    />
  );
}

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster="/images/blender-poster.png"
    />
  );
}

import { Player } from "@livepeer/react";
import Image from "next/image";

import blenderPoster from "./images/blender-poster.png";

const PosterImage = () => {
  return (
    <Image
      src={blenderPoster}
      layout="fill"
      objectFit="cover"
      placeholder="blur"
    />
  );
};

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster={<PosterImage />}
    />
  );
}

import posterImage from "./images/blender-poster.png";

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      poster={posterImage}
    />
  );
}

​

showLoadingSpinner

Shows/hides the loading spinner for the media content. Defaults to true.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      showLoadingSpinner={false}
    />
  );
}

​

hlsConfig

Sets the underlying HLS.js config used for playback. See the HLS.js docs for more details on the possible values.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      hlsConfig={{ liveSyncDurationCount: Infinity }}
    />
  );
}

​

webrtcConfig

Sets the underlying WebRTC config used for WHEP SDP negotiation. The possible config options are constant and sdpTimeout.

A constant=true boolean indicates that audio will not be distorted if the playhead falls behind the livestream. This is usually used for music applications, where audio quality and consistency is more important than latency.

The sdpTimeout config sets the amount of time in milliseconds that the Player will wait for a response from SDP negotiation before falling back to HLS.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      webrtcConfig={{ constant: true, sdpTimeout: 5000 }}
    />
  );
}

​

controls

Configures the timeout for autohiding controls, default volume, and (only on web) if keyboard hotkeys for controlling video are enabled.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      controls={{ autohide: 0, hotkeys: false, defaultVolume: 0.6 }}
    />
  );
}

​

autoPlay and muted

Sets the video to autoplay when the content comes into focus on the webpage. If autoPlay is specified, muted will be forced to be true. This is enforced in many modern browsers.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      muted
      autoPlay
    />
  );
}

​

objectFit

Sets the video’s object fit property. Defaults to contain. cover is usually used when there is a guarantee that the aspectRatio matches the content displayed in the Player.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      aspectRatio="1to1"
      objectFit="cover"
    />
  );
}

​

showPipButton

import { Player } from "@livepeer/react";

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      showPipButton
    />
  );
}

import { Player } from "@livepeer/react";

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      showPipButton
    />
  );
}

​

viewerId

Allows a wallet identifier to be passed to the backend which allows for querying views by an identifier. This should be an wallet’s public address.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      viewerId="0xabcd000000000000000000000000000000001234"
    />
  );
}

​

autoUrlUpload

Enables automatic upload and playback from decentralized storage providers. Currently supports IPFS CIDs and IPFS/Arweave URLs. Defaults to true.

If fallback is specified, while the URL upload is being processed in the background, the video will start non-transcoded playback immediately (defaulting to w3s.link for IPFS and arweave.net for Arweave). Once this finishes, the Player will switch to playing from the transcoded version from the Livepeer provider. To show/hide the indicator of current upload progress, see showUploadingIndicator.

It is highly recommended for the best playback experience to upload from an Arweave/IPFS URL using useCreateAsset (with the format ipfs://<CID> or ar://<HASH>) before presenting the content to the user - the first view with automatic URL upload can take a few minutes, then it will be permanently cached and play back quickly.

function PlayerComponent() {
  return (
    <Player
      title="Workout NFT"
      src="ipfs://QmNmNBQE3RqdkN3KpeBVxpGDHUe8c9Bh5YNerERNoo98rB/4038.mp4"
      autoUrlUpload={{ fallback: true, ipfsGateway: "https://w3s.link" }}
    />
  );
}

​

showUploadingIndicator

Shows/hides the uploading indication for autoUrlUpload. Defaults to true - only used with autoUrlUpload.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      autoUrlUpload={{ fallback: true }}
      showUploadingIndicator={false}
    />
  );
}

​

theme

Sets the Player-specific theme overrides. It is recommended to use LivepeerConfig for any global app styles, and the theme prop to override those styles on a per-Player basis.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      theme={{
        borderStyles: {
          containerBorderStyle: "hidden",
        },
        colors: {
          accent: "#00a55f",
        },
        space: {
          controlsBottomMarginX: "10px",
          controlsBottomMarginY: "5px",
          controlsTopMarginX: "15px",
          controlsTopMarginY: "10px",
        },
        radii: {
          containerBorderRadius: "0px",
        },
      }}
    />
  );
}

​

children

​

streamOfflineErrorComponent

Sets the error component that is shown when playback fails due to the stream being offline. When this component is shown, the Player will retry playback in the background. This will override the OfflineStreamError component.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      streamOfflineErrorComponent={
        <div>
          Stream is offline. Playback will start automatically once the stream
          has started.
        </div>
      }
    />
  );
}

​

accessControlErrorComponent

Sets the error component that is shown when playback fails due to an access control error. This will override the PrivateStreamError component.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      accessControlErrorComponent={
        <div>It looks like you don't have permission to view this content.</div>
      }
    />
  );
}

​

playbackFailedErrorComponent

Sets the error component that is shown when playback fails for a generic reason (usually this is an intermittent network issue). When this component is shown, the Player will be retrying playback in the background, with linear backoff. This will override the GenericError component.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      playbackFailedErrorComponent={
        <div>
          Playback failed! Please wait while we retry in the background.
        </div>
      }
    />
  );
}

​

mediaElementRef

Sets the React callback ref passed to the underlying media element. Useful when integrating with third party tools, or when access to the underlying video element is needed (usually it isn’t!). Simple refs are not supported - only callback refs (which will be called when the underlying media element is set/updated on initial render).

import { useCallback } from "react";

function PlayerComponent() {
  const mediaElementRef = useCallback((ref: HTMLMediaElement) => {
    console.log(ref.duration);
  }, []);

  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      mediaElementRef={mediaElementRef}
    />
  );
}

import { useCallback } from "react";

function PlayerComponent() {
  const mediaElementRef = useCallback((ref: HTMLMediaElement) => {
    console.log(ref.duration);
  }, []);

  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      mediaElementRef={mediaElementRef}
    />
  );
}

import { useCallback } from "react";

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      mediaElementRef={async (ref) => {
        await ref?.setVolumeAsync(0.5);
      }}
    />
  );
}

​

onPlaybackStatusUpdate

Callback called when the Player store status updates. This must be used with playbackStatusSelector to limit state updates. This allows developers to use the underlying state of the Player component in their UI.

function PlayerComponent() {
  return (
    <Player
      title="Agent 327: Operation Barbershop"
      playbackId="f5eese9wwl88k4g8"
      onPlaybackStatusUpdate={(muted) => console.log(muted)}
      playbackStatusSelector={(state) => state.muted}
    />
  );
}

​

Hooks

​

usePlayerList

The usePlayerList hook makes it easy to preload and display videos in a FlatList-compatible list, by using viewabilityConfigCallbackPairs to trigger preloading on upcoming videos, and automatically playing/pausing media when it is shown/hidden from the list.

See our Expo sample app for a real-world example.

​

Usage

const videos = [
  {
    title: "Fountain",
    playbackId: "6119i9hncfr7gopr",
  },
  {
    title: "Happy Dog",
    playbackId: "8cf0gfaqtuajakyf",
  },
];

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
    itemVisibleMinimumViewTime: 100,
    itemVisiblePercentThreshold: 60,
    itemPreload: 2,
  });

  return (
    <FlatList
      data={listProps.data}
      viewabilityConfigCallbackPairs={listProps.viewabilityConfigCallbackPairs}
      renderItem={({ item, index }) => (
        <Player
          {...item.playerProps}
          playbackId={item.playbackId}
          title={item.title}
          autoPlay
          loop
        />
      )}
    />
  );
}

​

Return Value

The return value extends the data array which is passed into the hook, to add Player-specific props to it. The viewabilityConfigCallbackPairs prop is also returned, which must be passed into the FlatList-compatible list to maintain the correct preloading/playing states for the Player(s).

{
  data: (
    TInputArray & {
      playerProps: {
        _isCurrentlyShown: boolean;
        priority: boolean;
      };
    }
  )[];

  viewabilityConfigCallbackPairs: ViewabilityConfigCallbackPairs;
}

​

Configuration

data

The data used in the list - required. This is extended to add Player-specific props, which are passed into the Player using item.playerProps.

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
  });

  return (
    <FlatList
      {...listProps}
      renderItem={({ item }) => (
        <Player {...item.playerProps} playbackId={item.playbackId} />
      )}
    />
  );
}

itemPreload

The number of items to preload ahead of the currently-viewable Player. For instance, if itemPreload is set to 8 and there are 30 items in the Player list, when the user is currently viewing the 5th item, the 6th-14th Players will actively preload in the background. Defaults to 3.

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
    itemPreload: 8,
  });
}

itemVisibleMinimumViewTime

The minimum amount of time in milliseconds that an item must be viewable before it is considered “shown”. This will also be the delay between when the item becomes visible and when the autoPlay logic is triggered. Defaults to 100 ms, use null to unset. See FlatList’s viewabilityConfig for more details.

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
    itemVisibleMinimumViewTime: 300,
  });
}

itemVisiblePercentThreshold

The percent of the item that must be visible for the item to count as “viewable”, from 0-100. Defaults to 60%, use null to unset. See FlatList’s viewabilityConfig for more details.

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
    itemVisiblePercentThreshold: 35,
  });
}

itemVisibleViewAreaCoveragePercentThreshold

The percent of the viewport that must be covered for a partially occluded item to count as “viewable”, 0-100. No default value. See FlatList’s viewabilityConfig for more details.

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
    itemVisiblePercentThreshold: null, // the default item percent can be unset, if needed
    itemVisibleViewAreaCoveragePercentThreshold: 75,
  });
}

itemVisibleWaitForInteraction

Indicates that the item is not considered viewable until the user scrolls or recordInteraction is called after render. Defaults to false. See FlatList’s viewabilityConfig for more details.

function SomeComponent() {
  const { listProps } = usePlayerList({
    data: videos,
    itemVisibleWaitForInteraction: true,
  });
}

​

SSR

​

Next.js

The Player also comes with a Tanstack Query prefetch query, prefetchPlayer, which makes it easy to prefetch the data used internally for the Player during server-side rendering.

First, you add a getStaticProps function to the page which you want to prefetch data on. The props should match the Player props to ensure that the correct data is prefetched.

import { prefetchPlayer, studioProvider } from "@livepeer/react";

export const getStaticProps = async () => {
  const dehydratedState = await prefetchPlayer(
    { playbackId },
    { provider: studioProvider({ apiKey: "yourStudioApiKey" }) }
  );

  return {
    props: {
      dehydratedState,
    },
    revalidate: 600,
  };
};

We need to update the _app.tsx to pass the dehydratedState in pageProps to the LivepeerConfig. We also move the livepeerClient into a useMemo hook so that a new client is created on each request.

import {
  LivepeerConfig,
  createReactClient,
  studioProvider,
} from "@livepeer/react";
import type { AppProps } from "next/app";

import { useMemo } from "react";

function App({ Component, pageProps }: AppProps<{ dehydratedState: string }>) {
  // we create a new livepeer client on each request so data is
  // not shared between users
  const livepeerClient = useMemo(
    () =>
      createReactClient({
        provider: studioProvider({
          apiKey: process.env.NEXT_PUBLIC_STUDIO_API_KEY,
        }),
      }),
    []
  );

  return (
    <LivepeerConfig
      dehydratedState={pageProps?.dehydratedState}
      client={livepeerClient}
    >
      <Component {...pageProps} />
    </LivepeerConfig>
  );
}

That’s it! You now have data prefetching on the server, which is passed to the browser and used to hydrate the initial query client.

​

Other Frameworks

The process is very similar for other frameworks, with the exception that there is a clearClient boolean which should be used to ensure that the client cache is not reused across users.

import { prefetchPlayer, studioProvider } from "@livepeer/react";

export const handleRequest = async (req, res) => {
  const dehydratedState = await prefetchPlayer(
    {
      playbackId,
      clearClient: true,
    },
    { provider: studioProvider({ apiKey: "yourStudioApiKey" }) }
  );

  // sanitize the custom SSR generated data
  // https://medium.com/node-security/the-most-common-xss-vulnerability-in-react-js-applications-2bdffbcc1fa0

  res.send(`
    <html>
      <body>
        <div id="root">${html}</div>
        <script>
          window.__REACT_QUERY_STATE__ = ${yourSanitizedDehydratedState};
        </script>
      </body>
    </html>
  `);
};

​

Technical Details

The Player is opinionated about the ways it handles playback of media, specifically regarding HLS reconnect and playback URL choices.

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HLS Reconnect

The Player will perform a linear backoff strategy when it encounters any network/response errors. The reconnect will initially wait one second, and add one second every retry. This ensures that if there are any intermittent network/API errors, they are resolved as quickly as possible. Most open source players do not do this automatically, which results in a poor playback experience for the user.

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MP4 Playback URLs

When videos are uploaded which are shorter than two minutes, the Studio provider will automatically generate MP4 renditions alongside the usual HLS playback URL. This allows for rapid playback/caching at the CDN layer to enable your application to load video instantly.

The MP4 renditions will be prioritized over HLS and are chosen with the following algorithm: the device screen width is multiplied by a static multiplier (currently set to x2.5). This value is then compared to the rendition widths, and the renditions are prioritized based on the distance between these values. This results in a choice of a rendition which is close to the screen size without visual quality issues. For instance, a device with a 1280 pixel width would compute 1280px * 2.5 = 3200px, and then sort the MP4 renditions by which are closest to this value.