Autoplay guide for media and Web Audio APIs - Web media technologies
automatically starting the playback of audio (or videos with audio tracks) immediately upon page load can be an unwelcome surprise to users. while autoplay of media serves a useful purpose, it should be used carefully and only when needed. in order to give users control over this, browsers often provide various forms of autoplay blocking. in this guide, we'll cover autoplay functionality in the various media and web audio apis, including a brief overview of how to use autoplay and how to work with browsers to handle autoplay blocking gracefully. autoplay blocking is not applied to <video> elements when the source media does not have an audio track, or if the audio track is muted. media with an active audio track are considered to be audible, and autoplay blocking applies to them. inaudibl...
...is, including a brief overview of how to use autoplay and how to work with browsers to handle autoplay blocking gracefully. autoplay blocking is not applied to <video> elements when the source media does not have an audio track, or if the audio track is muted. media with an active audio track are considered to be audible, and autoplay blocking applies to them. inaudible media are not affected by autoplay blocking. autoplay and autoplay blocking the term autoplay refers to any feature that causes audio to begin to play without the user specifically requesting that playback begin. this includes both the use of html attributes to autoplay media as well as the user of javascript code to start playback outside the context of handling user input. that means that both of the following are considered ...
... blocking. autoplay and autoplay blocking the term autoplay refers to any feature that causes audio to begin to play without the user specifically requesting that playback begin. this includes both the use of html attributes to autoplay media as well as the user of javascript code to start playback outside the context of handling user input. ...
...And 44 more matches

HTMLMediaElement.autoplay - Web APIs
the htmlmediaelement.autoplay property reflects the autoplay html attribute, indicating whether playback should automatically begin as soon as enough media is available to do so without interruption. a media element whose source is a mediastream and whose autoplay property is true will begin playback when it becomes active (that is, when mediastream.active becomes true). note: sites which automatically play audio (or videos with an audio track) can be an unpleasant experience for users, so it should be avoided when possible. if you must offer autoplay functionality, you should make it opt-in (requiring a user to specifically enable it). however, autoplay can be useful when creating media elements whose source will be set at a later time, under user control. for a much more in-depth look at a...
...dio (or videos with an audio track) can be an unpleasant experience for users, so it should be avoided when possible. if you must offer autoplay functionality, you should make it opt-in (requiring a user to specifically enable it). however, autoplay can be useful when creating media elements whose source will be set at a later time, under user control. for a much more in-depth look at autoplay, autoplay blocking, and how to respond whena autoplay is blocked by the user's browser, see our article autoplay guide for media and web audio apis. syntax htmlmediaelement.autoplay = true | false; var autoplay = htmlmediaelement.autoplay; value a boolean whose value is true if the media element will begin playback as soon as enough content has loaded to allow it to do so without interruption. note:...
...cked by the user's browser, see our article autoplay guide for media and web audio apis. syntax htmlmediaelement.autoplay = true | false; var autoplay = htmlmediaelement.autoplay; value a boolean whose value is true if the media element will begin playback as soon as enough content has loaded to allow it to do so without interruption. note: some browsers offer users the ability to override autoplay in order to prevent disruptive audio or video from playing without permission or in the background. do not rely on autoplay actually starting playback and instead use play event. examples ... ...
...bility to override autoplay in order to prevent disruptive audio or video from playing without permission or in the background. do not rely on autoplay actually starting playback and instead use play event. examples ... <video id="video" controls> <source src="https://player.vimeo.com/external/250688977.sd.mp4?s=d14b1f1a971dde13c79d6e436b88a6a928dfe26b&profile_id=165"> </video> *** disable autoplay (recommended) *** false is the default value document.queryselector('#video').autoplay = false; specifications specification status comment html living standardthe definition of 'htmlmediaelement.autoplay' in that specification. living standard no change from html5 html5the definition of 'htmlmediaelement.autoplay' in that specification. ...

Feature-Policy: autoplay - HTTP
the http feature-policy header autoplay directive controls whether the current document is allowed to autoplay media requested through the htmlmediaelement interface. when this policy is enabled and there were no user gestures, the promise returned by htmlmediaelement.play() will reject with a domexception. the autoplay attribute on <audio> and <video> elements will be ignored. for more details on autoplay and autoplay blocking, see the article autoplay guide for media and web audio apis. syntax feature-policy: autoplay <allowlist>; <allowlist> an allowlist is a list of origins that takes one or more of the following values, separated by spaces: *: the feature will be allowed in this document, and all nested browsing contexts (iframes) regardless of their origin. 'self': the ...

Audio for Web games - Game development
io caveats by far the most difficult platforms to provide web audio support for are mobile platforms. unfortunately these are also the platforms that people often use to play games. there are a couple of differences between desktop and mobile browsers that may have caused browser vendors to make choices that can make web audio difficult for game developers to work with. let's look at these now. autoplay browser autoplay policy now affects desktop and mobile browsers. there is further information about it here from the google developers site. it is worth noting that autoplay with sound is allowed if: the user has interacted with the domain. on mobile the user has added the site to their home screen. many browsers will simply ignore any requests made by your game to automatically play audi...
...nsider priming them as soon as something like a start button is pressed. to prime audio like this we want to play a part of it; for this reason it is useful to include a moment of silence at the end of your audio sample. jumping to, playing, and then pausing that silence will mean we can now use javascript to play that file at arbitrary points. ...
...if possible, you should try your code on several devices and platforms to see how it works. volume programmatic volume control may be disabled in mobile browsers. the reason often given is that the user should be in control of the volume at the os level and this shouldn't be overridden. ...
...And 3 more matches

<audio>: The Embed Audio element - HTML: Hypertext Markup Language
to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the above example shows simple usage of the <audio> element. ...
...side the src attribute; we can include other attributes to specify information such as whether we want it to autoplay and loop, whether we want to show the browser's default audio controls, etc. the content inside the opening and closing <audio></audio> tags is shown as a fallback in browsers that don't support the element. attributes this element's attributes include the global attributes. autoplay a boolean attribute: if specified, the audio will automatically begin playback as soon as it can do so, without waiting for the entire audio file to finish downloading. ...
...t's attributes include the global attributes. autoplay a boolean attribute: if specified, the audio will automatically begin playback as soon as it can do so, without waiting for the entire audio file to finish downloading. note: sites that automatically play audio (or videos with an audio track) can be an unpleasant experience for users, so should be avoided when possible. if you must offer autoplay functionality, you should make it opt-in (requiring a user to specifically enable it). however, this can be useful when creating media elements whose source will be set at a later time, under user control. see our autoplay guide for additional information about how to properly use autoplay. controls if this attribute is present, the browser will offer controls to allow the user to control aud...
...And 3 more matches

Experimental features in Firefox
e most common use cases for these properties don't work, so they're both disabled by default. see bug 1057233 for more details. release channel version added enabled by default? nightly 33 no developer edition 33 no beta 33 no release 33 no preference name media.track.enabled dom document property: autoplaypolicy the document property autoplaypolicy returns a string indicating how the browser handles requests to automatically play media (either using the autoplay property on a media element or by attempting to trigger playback from javascript code. the spec for this api is still being written. the value changes over time depending on what the user is doing, their preferences, and the state of the b...
...see bug 1506289 for more details. ...
...sts to automatically play media (either using the autoplay property on a media element or by attempting to trigger playback from javascript code. the spec for this api is still being written. the value changes over time depending on what the user is doing, their preferences, and the state of the browser in general. potential values include allowed (autoplay is currently permitted), allowed-muted (autoplay is allowed but only with no—or muted—audio), and disallowed (autoplay is not allowed at this time). see bug 1506289 for more details. ...
...And 2 more matches

<video>: The Video Embed element - HTML: Hypertext Markup Language
ractive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the above example shows simple usage of the <video> element. ...
...er attributes to specify information such as video width and height, whether we want it to autoplay and loop, whether we want to show the browser's default video controls, etc. the content inside the opening and closing <video></video> tags is shown as a fallback in browsers that don't support the element. attributes like all other html elements, this element supports the global attributes. autoplay a boolean attribute; if specified, the video automatically begins to play back as soon as it can do so without stopping to finish loading the data. note: sites that automatically play audio (or videos with an audio track) can be an unpleasant experience for users, so should be avoided when possible. ...
... other html elements, this element supports the global attributes. autoplay a boolean attribute; if specified, the video automatically begins to play back as soon as it can do so without stopping to finish loading the data. note: sites that automatically play audio (or videos with an audio track) can be an unpleasant experience for users, so should be avoided when possible. if you must offer autoplay functionality, you should make it opt-in (requiring a user to specifically enable it). however, this can be useful when creating media elements whose source will be set at a later time, under user control. see our autoplay guide for additional information about how to properly use autoplay. ...
...And 2 more matches

HTMLMediaElement - Web APIs
e53" text-anchor="middle" alignment-baseline="middle">htmlmediaelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties this interface also inherits properties from its ancestors htmlelement, element, node, and eventtarget. htmlmediaelement.audiotracks a audiotracklist that lists the audiotrack objects contained in the element. ...
...line="middle">htmlmediaelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties this interface also inherits properties from its ancestors htmlelement, element, node, and eventtarget. htmlmediaelement.audiotracks a audiotracklist that lists the audiotrack objects contained in the element. htmlmediaelement.autoplay a boolean that reflects the autoplay html attribute, indicating whether playback should automatically begin as soon as enough media is available to do so without interruption. note: automatically playing audio when the user doesn't expect or desire it is a poor user experience and should be avoided in most cases, though there are exceptions. see the autoplay guide for media and web audio apis for more information. keep in mind tha...
...ating whether playback should automatically begin as soon as enough media is available to do so without interruption. note: automatically playing audio when the user doesn't expect or desire it is a poor user experience and should be avoided in most cases, though there are exceptions. see the autoplay guide for media and web audio apis for more information. keep in mind that browsers may ignore autoplay requests, so you should ensure that your code isn't dependent on autoplay working. htmlmediaelement.buffered read only returns a timeranges object that indicates the ranges of the media source that the browser has buffered (if any) at the moment the buffered property is accessed. htmlmediaelement.controller is a mediacontroller object that represents the media controller assigned to the el...
...data has been loaded loadstart fired when the browser has started to load a resource. pause fired when a request to pause play is handled and the activity has entered its paused state, most commonly occurring when the media's htmlmediaelement.pause() method is called. play fired when the paused property is changed from true to false, as a result of the htmlmediaelement.play() method, or the autoplay attribute playing fired when playback is ready to start after having been paused or delayed due to lack of data progress fired periodically as the browser loads a resource. ratechange fired when the playback rate has changed. seeked fired when a seek operation completes seeking fired when a seek operation begins stalled fired when the user agent is trying to fetch media data, but dat...

Using the Web Audio API - Web APIs
the sound to be available to the web audio api. controlling sound when playing sound on the web, it's important to allow the user to control it. depending on the use case, there's a myriad of options, but we'll provide functionality to play/pause the sound, alter the track's volume, and pan it from left to right. controlling sound programmatically from javascript code is covered by browsers' autoplay support policies, as such is likely to be blocked without permission being granted by the user (or a whitelist). autoplay policies typically require either explicit permission or a user engagement with the page before scripts can trigger audio to play. these special requirements are in place essentially because unexpected sounds can be annoying and intrusive, and can cause accessibility problems...
...so, let's start by taking a look at our play and pause functionality. ...
...so, let's start by taking a look at our play and pause functionality. ...
...(audiocontext.destination); a good way to visualise these nodes is by drawing an audio graph so you can visualize it. this is what our current audio graph looks like: now we can add the play and pause functionality. ...

Cross-browser audio basics - Developer guides
look different among various browsers. so creating your own controls ensures a consistent look for the controls across all browsers. html5 audio in detail now we've looked at a basic example, let's now explore the different aspects of html5 audio in more detail. audio html attributes we can specify a number of attributes with the audio tag to further determine the way audio is initialized. autoplay specifying autoplay will cause the audio to start playing as soon as possible and without any user interaction — in short, the audio will autoplay. <audio autoplay> ... </audio> note: this value is often ignored on mobile platforms, and its use is not recommended unless really necessary. auto-playing audio (and video) is usually really annoying. plus browsers have policies that will block...
... loop the loop attribute will ensure that upon getting to the end of the audio clip, the audio clip will loop back to the beginning and start playing again. <audio loop> ... </audio> muted if you want the audio to start muted (no volume), add the muted attribute. <audio muted> ... ...
... loop the loop attribute will ensure that upon getting to the end of the audio clip, the audio clip will loop back to the beginning and start playing again. <audio loop> ... ...
... related to playback progress }); playing the playing event is initiated when playback is ready to start after having being paused due to lack of media data. waiting the waiting event is triggered when playback has stopped due to lack of media data, although it is expected to resume once data becomes available. play the play event is initiated after the play() method is returned or when the autoplay attribute has caused playback to begin. this is when the state of the media switches from paused to playing. pause the pause event is triggered after the pause() method is returned. this is when the states switch from playing to paused. ended the ended event is initiated when the end of the media is reached. myaudio.addeventlistener("ended", function() { //do something once audio track has...

Video and audio content - Learn web development
n unnecessary use of resources. refer to our guide to media types and formats for help selecting the best containers and codecs for your needs, as well as to look up the right mime types to specify for each. other <video> features there are a number of other features you can include when displaying an html video. take a look at our next example: <video controls width="400" height="400" autoplay loop muted preload="auto" poster="poster.png"> <source src="rabbit320.mp4" type="video/mp4"> <source src="rabbit320.webm" type="video/webm"> <p>your browser doesn't support html video. here is a <a href="rabbit320.mp4">link to the video</a> instead.</p> </video> the resulting ui looks something like this: the new features are: width and height you can control the video size ...
...e new features are: width and height you can control the video size either with these attributes or with css. in both cases, videos maintain their native width-height ratio — known as the aspect ratio. if the aspect ratio is not maintained by the sizes you set, the video will grow to fill the space horizontally, and the unfilled space will just be given a solid background color by default. autoplay makes the audio or video start playing right away, while the rest of the page is loading. you are advised not to use autoplaying video (or audio) on your sites, because users can find it really annoying. loop makes the video (or audio) start playing again whenever it finishes. this can also be annoying, so only use if really necessary. muted causes the media to play with the sound turned off...
... it is intended to be used for a splash screen or advertising screen. preload used for buffering large files; it can take one of three values: "none" does not buffer the file "auto" buffers the media file "metadata" buffers only the metadata for the file you can find the above example available to play live on github (also see the source code.) note that we haven't included the autoplay attribute in the live version — if the video starts to play as soon as the page loads, you don't get to see the poster! the <audio> element the <audio> element works just like the <video> element, with a few small differences as outlined below. a typical example might look like so: <audio controls> <source src="viper.mp3" type="audio/mp3"> <source src="viper.ogg" type="audio/ogg"> <p>y...

Multimedia: video - Learn web development
load time while serving the smallest video file size based on each browsers file type support. why optimize your multimedia? for the average website, 25% of bandwidth comes from video. optimizing video has the potential for very large bandwidth savings that translate into better website performance. optimizing video delivery it's best to compress all video, optimize <source> order, set autoplay, remove audio from muted video, optimize video preload, and consider streaming the video. the sections below describe each of these optimization techniques. compress all videos most video compression work compares adjacent frames within a video, with the intent of removing detail that is identical in both frames. compress the video and export to multiple video formats, including webm, mpeg-4/h.
... sure that the most compressed video still looks good. there are some compression algorithms that can make video look (bad) like an animated gif. while a 128 kb video may seem like it could provide a better user experience than a 10 mb download, a grainy gif-like video may reflect poorly on the brand or project. see caniuse.com for current browser support of video and other media types. video autoplay to ensure that a looping background video autoplays, you must add several attributes to the video tag: autoplay, muted, and playsinline. <video autoplay="" loop="" muted="true" playsinline="" src="backgroundvideo.mp4"> while the loop and autoplay make sense for a looping and autoplaying video, the muted attribute is required for autoplay in mobile browsers. playsinline is required for mobile ...
...laysinline="" src="backgroundvideo.mp4"> while the loop and autoplay make sense for a looping and autoplaying video, the muted attribute is required for autoplay in mobile browsers. playsinline is required for mobile safari, allowing videos to play without forcing fullscreen mode. remove audio from muted hero videos for hero-video or other video without audio, removing audio is smart. <video autoplay="" loop="" muted="true" playsinline="" id="hero-video"> <source src="banner_video.webm" type='video/webm; codecs="vp8, vorbis"'> <source src="web_banner.mp4" type="video/mp4"> </video> this hero-video code (above) is common to conference websites and corporate home pages. it includes a video that is auto-playing, looping, and muted. there are no controls, so there is no way to hear...

HTMLMediaElement: play event - Web APIs
the play event is fired when the paused property is changed from true to false, as a result of the play method, or the autoplay attribute. bubbles no cancelable no interface event target element default action none event handler property globaleventhandlers.onplay specification html5 media examples these examples add an event listener for the htmlmediaelement's play event, then post a message when that event handler has reacted to the event firing. ...
...ia examples these examples add an event listener for the htmlmediaelement's play event, then post a message when that event handler has reacted to the event firing. using addeventlistener(): const video = document.queryselector('video'); video.addeventlistener('play', (event) => { console.log('the boolean paused property is now false. ...
...stener('play', (event) => { console.log('the boolean paused property is now false. either the ' + 'play() method was called or the autoplay attribute was toggled.'); }); using the onplay event handler property: const video = document.queryselector('video'); video.onplay = (event) => { console.log('the boolean paused property is now false. either the ' + 'play() method was called or the autoplay attribute was toggled.'); }; specifications specification status html living standardthe definition of 'play media event' in that specification. living standard html5the definition of 'play media event' in that specification. recommendation ...

Recording a media element - Web APIs
ata (although it's in a raw, unwrapped form that isn't very useful). </p> <br> let's start by looking at the key bits of the html. there's a little more than this, but it's just informational rather than being part of the core operation of the app. ...
...of the core operation of the app. <div class="left"> <div id="startbutton" class="button"> start </div> <h2>preview</h2> <video id="preview" width="160" height="120" autoplay muted></video> </div> we present our main interface in two columns. on the left is a start button and a <video> element which displays the video preview; this is the video the user's camera sees. note that the autoplay attribute is used so that as soon as the stream starts to arrive from the camera, it immediately gets displayed, and the muted attribute is specified to ensure that the sound from the user's microphone isn't output to their speakers, causing an ugly feedback loop. <div class="right"> <div id="stopbutton" class="button"> stop </div> <h2>recording</h2> <video id="recording" width="160"...
...ack loop. <div class="right"> <div id="stopbutton" class="button"> stop </div> <h2>recording</h2> <video id="recording" width="160" height="120" controls></video> <a id="downloadbutton" class="button"> download </a> </div> on the right we see a stop button and the <video> element which will be used to play back the recorded video. notice that the playback panel doesn't have autoplay set (so the playback doesn't start as soon as media arrives), and it has controls set, which tells it to show the user controls to play, pause, and so forth. below the playback element is a button for downloading the recorded video. <div class="bottom"> <pre id="log"></pre> </div> css content body { font: 14px "open sans", "arial", sans-serif; } video { margin-top: 2px; border: 1px s...

Web Audio API best practices - Web APIs
ption, tone.js is a great library. it provides advanced scheduling capabilities, synths, and effects, and intuitive musical abstractions built on top of the web audio api. r-audio, from the bbc's research & development department, is a library of react components aiming to provide a "more intuitive, declarative interface to web audio". if you're used to writing jsx it might be worth looking at. autoplay policy browsers have started to implement an autoplay policy, which in general can be summed up as: "create or resume context from inside a user gesture". but what does that mean in practice? a user gesture has been interpreted to mean a user-initiated event, normally a click event. browser vendors decided that web audio contexts should not be allowed to automatically play audio; they should...
...but how do we handle this? when you create an audio context (either offline or online) it is created with a state, which can be suspended, running, or closed. when working with an audiocontext, if you create the audio context from inside a click event the state should automatically be set to running. ...
... be set to suspended and it will need to be started after user interaction. we can use the same click event example here, test for the state of the context and start it, if it is suspended, using the resume() method. const audioctx = new audiocontext(); const button = document.queryselector('button'); button.addeventlistener('click', function() { // check if context is in suspended state (autoplay policy) if (audioctx.state === 'suspended') { audioctx.resume(); } }, false); you might instead be working with an offlineaudiocontext, in which case you can resume the suspended audio context with the startrendering() method. user control if your website or application contains sound, you should allow the user control over it, otherwise again, it will become annoying. this ca...