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API and Configuration


MediaElement supports the following video/audio tag attributes:

Attribute Description
autoplay Specifies that the video will start playing as soon as it is ready
class Specifies one or more class names for an element (refers to a class in a style sheet)
controls Specifies that video controls should be displayed (such as a play/pause button etc).
id Specifies a unique id for an element; if not specified, the plugin will create one automatically
height Sets the height of the video player in pixels; you can also indicate percentages
loop Specifies that the video will start over again, every time it is finished
muted Specifies that the audio output of the video should be muted
poster Specifies an image to be shown while the video is downloading, or until the user hits the play button. Generally, a PNG or JPEG image. If not specified, the player will use the background color specified in the style sheet
preload Specifies if and how the author thinks the video should be loaded when the page loads; possible values: auto, metadata or none (recommended)
src Specifies the URL of the video file; this value can also be indicated with source tags (refer to the Multiple Codecs section for more information)
style Specifies an inline CSS style for an element
tabindex Specifies the tabbing order of an element. To avoid the keyboard to focus on this element, use -1; otherwise, 0
title Specifies extra information about an element
width Sets the width of the video player in pixels; you can also indicate percentages

The following markup displays all the attributes listed above for more clarity:

<video autoplay controls class="player" id="player1" height="360"
	width="100%" loop muted poster="/path/to/poster.jpg"
	preload="none" src="/path/to/media.mp4"
	style="max-width: 100%" tabindex="0" title="MediaElement">



As a standalone library, MediaElement.js can be configured using the following settings.

Parameter Type Default Description
renderers array [] List of the renderers to use
fakeNodeName string mediaelementwrapper Name of MediaElement container
pluginPath string build/ Path where Flash shims are located
shimScriptAccess string sameDomain Flag in <object> and <embed> to determine whether to use local or CDN files. Possible values: always (CDN version) or sameDomain (local files)
success callback Action(s) that will be executed as soon as the source is loaded; passes 2 arguments: media (the wrapper that mimics all the native events/properties/methods for all renderers) and node (the original HTML video, audio or iframe tag where the media was loaded originally; if html5 is being used, media and node are the basically the same)
error callback Action(s) that will be executed if source doesn't load for any reason. Passes same arguments as success
dailymotion object See Documentation
dash object Accepts debug, drm (object to load protected/licensed streaming; read here for more information) and path parameters to indicate dash.js URL/local path
facebook object See Documentation (and a custom lang parameter to indicate the FB SDK language)
flv object See Documentation (and a custom path parameter to indicate where to load library)
hls object See Documentation (and a custom path parameter to indicate where to load library)
youtube object See Documentation; also, a custom nocookie parameter to switch to YouTube's no-cookie URL and imageQuality parameter if user decides to use Image API to load a YouTube poster based on YouTube video ID (possible values: default, hqdefault, mqdefault, sddefault and maxresdefault)


  1. Vimeo and Soundcloud don't need any configuration for now since they are pretty straight forward.
  2. To use DRM with M(PEG)-DASH, make sure CORS are configured correctly, and also your site MUST be using SSL.
  3. Both success and error will be available for both MediaElement and MediaElementPlayer; however, when using MediaElementPlayer, a third argument is passed: instance, which gives access to the methods associated to the MediaElementPlayer class.
  4. When using MediaElementPlayer, error arguments will be: error (the details on the error event), media and node.


Including the above, MediaElementPlayer object allows the following extra configuration elements.

Parameter Type Default Description
classPrefix string mejs__ Class prefix for player elements
poster string (empty) Poster URL that overrides poster attribute
showPosterWhenEnded boolean false When the video is ended, show the poster
showPosterWhenPaused boolean false When the video is paused, show the poster
defaultVideoWidth number 480 Default width if the <video> width is not specified
defaultVideoHeight number 270 Default height if the <video> height is not specified
videoWidth number -1 If set, overrides <video> width
videoHeight number -1 If set, overrides <video> height
defaultAudioWidth number 400 Default width for audio player if the user doesn't specify
defaultAudioHeight number 30 Default height for audio player if the user doesn't specify
defaultSeekBackwardInterval function Default amount to move back when back key is pressed. Default callback is represented like: function(media) {return (media.duration * 0.05);}
defaultSeekForwardInterval function Default amount to move forward when forward key is pressed. Default callback is represented like: function(media) {return (media.duration * 0.05);}
setDimensions boolean true Set dimensions via JS instead of CSS
audioWidth number -1 Width of audio player
audioHeight number -1 Height of audio player
startVolume number 0.8 Initial volume when the player starts (overrided by user cookie); represented with float values
loop boolean false Whether to loop or not media
autoRewind boolean true Rewind to beginning when media ends
enableAutosize boolean true Resize to media dimensions
timeFormat string (empty) Time format to use. Default: 'mm:ss'. Supported units: h: hour, m: minute, s: second and f: frame count. If use 2 letters, 2 digits will be displayed (hh:mm:ss)
alwaysShowHours boolean false Force the hour marker (##:00:00)
showTimecodeFrameCount boolean false Whether to show frame count in timecode (##:00:00:00)
framesPerSecond number 25 Used when showTimecodeFrameCount is set to true
autosizeProgress boolean true Automatically calculate the width of the progress bar based on the sizes of other elements
alwaysShowControls boolean false Hide controls when playing and mouse is not over the video
hideVideoControlsOnLoad boolean false Display the video control when media is loading
hideVideoControlsOnPause boolean false Display the video controls when media is paused
clickToPlayPause boolean true Enable click video element to toggle play/pause
controlsTimeoutDefault number 1500 Time in ms to hide controls
controlsTimeoutMouseEnter number 2500 Time in ms to trigger the timer when mouse moves
controlsTimeoutMouseLeave number 1000 Time in ms to trigger the timer when mouse leaves
iPadUseNativeControls boolean false Force iPad's native controls
iPhoneUseNativeControls boolean false Force iPhone's native controls
AndroidUseNativeControls boolean false Force Android's native controls
features array [...] List of features/plugin to use in the player; some will be included in the control bar (by default IN STRICT ORDER: playpause, current, progress, duration, tracks, volume, fullscreen)
useDefaultControls boolean false If set to true, all the default control elements listed in features above will be used, and the features will append any other plugins indicated in features. This approach is used mostly when adding more plugins WITHOUT modifying the elements in the control bar in any capacity
isVideo boolean true Only for dynamic purposes
stretching string auto Stretching modes for video player. If auto is set, player will try to find the max-width and max-height CSS styles to turn it into responsive mode; otherwise, will set the dimensions specified in the tag (same as setting this option as none). The fill mode will try to use the available space to make the video fit and, when window is resized, it will crop the dimensions to center it according to the available space.
enableKeyboard boolean true Turns keyboard support on and off for this instance
pauseOtherPlayers boolean true When focused player starts, it will pause other players
secondsDecimalLength number 0 Number of decimal places to show if frames are shown
customError string/callback null If error happens, set up customized HTML message through a string or a function. The function has 2 parameters: media (the wrapper that mimics all the native events/properties/methods for all renderers) and node (the original HTML video, audio or iframe tag where the media was loaded originally)
keyActions array [...] Keyboard actions to trigger different actions. Accepts array of objects in format: {keys: [1,2,3...], action: function(player, media) { ... }}. To see the entire list, please check /src/js/mediaelementplayer-player.js
duration number -1 Start point to detect changes on media time duration
timeAndDurationSeparator string <span> &#124; </span> Separator between the current time and the total duration of media being played
hideVolumeOnTouchDevices boolean true Touch devices (specially mobile devices) have different way to handle volume, so no need to display it
enableProgressTooltip boolean true Enable/disable tooltip that shows time popup in progress bar
useSmoothHover boolean true Enable smooth behavior when hovering progress bar (like YouTube's)
forceLive boolean false If set to true, the Live Broadcast message will be displayed and progress bar will be hidden, no matter if duration is a valid number
audioVolume string horizontal Position of volume slider on audio element
videoVolume string vertical Position of volume slider on video element
usePluginFullScreen boolean true Flag to activate detection of Pointer events when on fullscreen mode
useFakeFullscreen boolean false Flag to bypass native capabilities on mobile devices and use the fake-fullscreen mode
tracksAriaLive boolean false By default, no WAI-ARIA live region - don't make a screen reader speak captions over an audio track.
hideCaptionsButtonWhenEmpty boolean true Option to remove the [cc] button when no <track kind="subtitles"> are present
toggleCaptionsButtonWhenOnlyOne boolean false If true and we only have one track, change captions to toggle button
startLanguage string (empty) Automatically turn on a <track> element. Note: Will not work when toggleCaptionsButtonWhenOnlyOne is set to true
slidesSelector string (empty) Selector for slides; could be any valid Javascript selector (#id, .class, img, etc.)
tracksText string null Title for Closed Captioning button for WARIA purposes
chaptersText string null Title for Chapters button for WARIA purposes
muteText string null Title for Mute button for WARIA purposes
unmuteText string null Title for Unmute button for WARIA purposes
allyVolumeControlText string null Title for Volume slider for WARIA purposes
fullscreenText string null Title for Fullscreen button for WARIA purposes
playText string null Title for Play/Pause button for WARIA purposes when media is playing
pauseText string null Title for Play/Pause button for WARIA purposes when media is paused


MediaElementPlayer is a complete audio and video player, but you can also use just the MediaElement object which replaces <video> and <audio> with a Flash player that mimics the properties, methods, and events of HTML MediaElement API.


Property Description GET SET
autoplay Set or return whether the audio/video should start playing as soon as it is loaded X X
buffered Return a TimeRanges object representing the buffered parts of the audio/video X
controls Set or return whether the audio/video should display controls (like play/pause etc.) X X
currentSrc Return the URL of the current audio/video X
currentTime Set or return the current playback position in the audio/video (in seconds) X X
duration Return the length of the current audio/video (in seconds); to determine it without playing media, preload="auto" must be set X
ended Return whether the playback of the audio/video has ended or not X
error Return a MediaError object representing the error state of the audio/video X
loop Set or return whether the audio/video should start over again when finished X X
muted Set or returns whether the audio/video is muted or not X X
paused Return whether the audio/video is paused or not X
readyState Return the current ready state of the audio/video X
seeking Return whether the user is currently seeking in the audio/video X
src Set or return the current source of the audio/video element X X
volume Set or return the volume of the audio/video X X


Method Description
load() Reload the audio/video element; also, it is used to update the audio/video element after changing the source or other settings
play() Start playing the audio/video
pause() Halt (pauses) the currently playing audio or video
stop() Only present to support Flash RTMP streaming in MediaElementPlayer. The equivalent for other scenarios is pause
remove() Destroy the video/audio player instance
canPlayType(type) Determine whether current player can/cannot play a specific media type; type is MIME type and each renderer has a whitelist of them
setPlayerSize (width, height) Set player's width and height also considering the stretching configuration
setPoster (url) Add a image tag with the poster's url inside the player's layer; you can pass an empty string to clear the poster
setMuted (muted) Mute/unmute the player; muted is a boolean value
setCurrentTime (time) Set a new current time for the player; time is either an integer or float number, and if negative, it will start from zero.
getCurrentTime () Retrieve the current time of the media being played
setVolume (volume) Set a volume level for the player; volume is a number between 0 and 1
getVolume () Retrieve the current volume level of the media being played
setSrc (src) Set a new URL/path for the player; each renderer has a different mechanism to set it
getSrc () Retrieve the media URL/path currently being played; each renderer has a different mechanism to return it


Event Action(s) executed when...
loadedmetadata Meta data (like dimensions and duration) are loaded
progress Browser is in the process of getting the media data
timeupdate The playing position has changed (like when the user fast forwards to a different point in the media)
seeking The seeking attribute is set to true indicating that seeking has started
seeked The seeking attribute is set to false indicating that seeking has ended
canplay A file is ready to start playing (when it has buffered enough to begin)
play The media is ready to start playing
playing The media actually has started playing
pause The media is paused either by the user or programmatically
ended The media has reach the end (a useful event for messages like "thanks for listening")
volumechange Volume is changed (including setting the volume to "mute")
captionschange The media has detected that captions have changed

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