Video and audio content - Learn web development
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.
... poster the url of an image which will be displayed before the video is played.
...ke 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!
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Creating a cross-browser video player - Developer guides
<figure id="videocontainer"> <video id="video" controls preload="metadata" poster="img/poster.jpg"> <source src="video/tears-of-steel-battle-clip-medium.mp4" type="video/mp4"> <source src="video/tears-of-steel-battle-clip-medium.webm" type="video/webm"> <source src="video/tears-of-steel-battle-clip-medium.ogg" type="video/ogg"> <!-- flash fallback --> <object type="application/x-shockwave-flash" data="flash-player.swf?videourl=video/tears-of-steel...
...-battle-clip-medium.mp4" width="1024" height="576"> <param name="movie" value="flash-player.swf?videourl=video/tears-of-steel-battle-clip-medium.mp4" /> <param name="allowfullscreen" value="true" /> <param name="wmode" value="transparent" /> <param name="flashvars" value="controlbar=over&amp;image=img/poster.jpg&amp;file=flash-player.swf?videourl=video/tears-of-steel-battle-clip-medium.mp4" /> <img alt="tears of steel poster image" src="img/poster.jpg" width="1024" height="428" title="no video playback possible, please download the video from the link below" /> </object> <!-- offer download --> <a href="video/tears-of-steel-battle-clip-medium.mp4">download mp4</a> </video> <figcaption>&copy; blender foundation | <a href="http:/...
... a poster image is defined for the video, and the preload attribute is set to metadata, which informs the browser that it should initially only attempt to load the metadata from the video file rather than the entire video file.
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<video>: The Video Embed element - HTML: Hypertext Markup Language
poster a url for an image to be shown while the video is downloading.
... if this attribute isn't specified, nothing is displayed until the first frame is available, then the first frame is shown as the poster frame.
...hosted by archive.org --> <!-- poster from peach.blender.org --> <video controls src="https://archive.org/download/bigbuckbunny_124/content/big_buck_bunny_720p_surround.mp4" poster="https://peach.blender.org/wp-content/uploads/title_anouncement.jpg?x11217" width="620"> sorry, your browser doesn't support embedded videos, but don't worry, you can <a href="https://archive.org/details/bigbuckbunny_124">download it</a> and w...
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Handling media support issues in web content - Web media technologies
using poster frames a poster frame is a still image that's representative of the content of a video.
... a good poster frame is one which is either a representative of the video's contents, or is an image which isn't even from the video itself but contains imagery and/or text which gives the reader a useful idea of the video's contents.
... in the case of an action movie, for example, the poster frame might be an iconic exemplar image from one of the film's best-known scenes.
... poster frames for video progressive images images—whether embedded using <img> or <picture>—don't support a concept similar to poster frames.

HTMLVideoElement.videoHeight - Web APIs
if the element's readystate is htmlmediaelement.have_nothing, then the value of this property is 0, because neither video nor poster frame size information is yet available.
... if the element is currently displaying the poster frame rather than rendered video, the poster frame's intrinsic size is considered to be the size of the <video> element.
...this can happen when the element switches from displaying the poster frame to displaying video content, or when the displayed video track changes.

HTMLVideoElement.videoWidth - Web APIs
if the element's readystate is htmlmediaelement.have_nothing, then the value of this property is 0, because neither video nor poster frame size information is yet available.
... if the element is currently displaying the poster frame rather than rendered video, the poster frame's intrinsic size is considered to be the size of the <video> element.
...this can happen when the element switches from displaying the poster frame to displaying video content, or when the displayed video track changes.

Web video codec guide - Web media technologies
posterizing posterization occurs when the compression results in the loss of color detail in gradients.
...the details of the feathers is largely lost due to these posterization artifacts.
... contouring contouring or color banding is a specific form of posterization in which the color blocks form bands or stripes in the image.

mozbrowseractivitydone
if the activity has a returnvalue set to true, then the activity is consumed when postresult or posterror is invoked on the activity by the receiving app.
...postresult and posterror calls made on such an activity will be ignored and have no effect.

HTML parser threading
speculative loads when the tree builder on the parser thread encounters html script, stylesheet link, video (with a poster frame), base or img or svg script, style or image elements, preload operations are appended to a speculative load queue.
...when the executor acts on speculative loads, it starts speculative http fetches for images (including video poster frames), style sheets and scripts.

Audio and Video Delivery - Developer guides
for further info see cross browser audio basics (html5 audio in detail) html video <video controls width="640" height="480" poster="initialimage.png" autoplay muted> <source src="videofile.mp4" type="video/mp4"> <!-- fallback for browsers that don't support mp4 --> <source src="videofile.webm" type="video/webm"> <!-- specifying subtitle files --> <track src="subtitles_en.vtt" kind="subtitles" srclang="en" label="english"> <track src="subtitles_no.vtt" kind="subtitles" srclang="no" label="norwegian"> <!-- fal...
...lback for browsers that don't support video tag --> <a href="videofile.mp4">download video</a> </video> the code above creates a video player of dimensions 640x480 pixels, displaying a poster image until the video is played.

MitM - MDN Web Docs Glossary: Definitions of Web-related terms
you could be connecting to a phishing server or an imposter server.

Handling common HTML and CSS problems - Learn web development
for example: <video id="video" controls preload="metadata" poster="img/poster.jpg"> <source src="video/tears-of-steel-battle-clip-medium.mp4" type="video/mp4"> <source src="video/tears-of-steel-battle-clip-medium.webm" type="video/webm"> <!-- offer download --> <p>your browser does not support html5 video; here is a link to <a href="video/tears-of-steel-battle-clip-medium.mp4">view the video</a> directly.</p> </video> this example includes a simple l...

HTMLMedia​Element​.textTracks - Web APIs
examples we start with a <video> that has several <track> children <video controls poster="/images/sample.gif"> <source src="sample.mp4" type="video/mp4"> <source src="sample.ogv" type="video/ogv"> <track kind="captions" src="samplecaptions.vtt" srclang="en"> <track kind="descriptions" src="sampledescriptions.vtt" srclang="en"> <track kind="chapters" src="samplechapters.vtt" srclang="en"> <track kind="subtitles" src="samplesubtitles_de.vtt" srclang="de"> <track kind="sub...

HTMLVideoElement - Web APIs
htmlvideoelement.poster is a domstring that reflects the poster html attribute, which specifies an image to show while no video data is available.

Media Session API - Web APIs
this might be a cd or dvd cover, a movie poster, a poster frame, or the like.