Created
December 6, 2017 02:19
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html5 video with positive and negative playbackrates (jog, shuttle and seeking)
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset='utf-8'> | |
| <title>HTML5 backward playback Video</title> | |
| </head> | |
| <body> | |
| <div> | |
| <video id='video' | |
| width="360" | |
| height="240" | |
| controls | |
| preload="auto"> | |
| <source id='mp4' | |
| src="VIDEOFILE.mov" | |
| type='video/mp4'> | |
| <p>Your user agent does not support the HTML5 Video element.</p> | |
| </video> | |
| <div id='buttons'> | |
| <button onclick="rev();">rev</button> | |
| <button onclick="ff();">ff</button> | |
| <button onclick="stop();">stop</button> | |
| </div> | |
| <table> | |
| <caption>Media Events</caption> | |
| <tbody id='events'> | |
| </tbody> | |
| </table> | |
| <table> | |
| <caption>Media Properties</caption> | |
| <tbody id='properties'> | |
| </tbody> | |
| </table> | |
| <table id='canPlayType'> | |
| <caption>canPlayType</caption> | |
| <tbody id='m_video'> | |
| </tbody> | |
| </table> | |
| <table id='tracks'> | |
| <caption>Tracks</caption> | |
| <tbody> | |
| <tr> | |
| <th>Audio</th> | |
| <th>Video</th> | |
| <th>Text</th> | |
| </tr> | |
| <tr> | |
| <td id='m_audiotracks' class='false'>?</td> | |
| <td id='m_videotracks' class='false'>?</td> | |
| <td id='m_texttracks' class='false'>?</td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| <script type="text/javascript"> | |
| function getVideo() { | |
| return document.getElementById('video'); | |
| } | |
| var jog = 0; | |
| function rev() { | |
| console.log('rev') | |
| jog-- | |
| tryJog(); | |
| } | |
| function ff() { | |
| console.log('ff') | |
| jog++ | |
| tryJog(); | |
| } | |
| function stop() { | |
| console.log('stop') | |
| jog = 0; | |
| getVideo().pause(); | |
| tryJog(); | |
| } | |
| function tryJog() { | |
| var j = jog | |
| console.log('jog=' + jog); | |
| if (j != 0) { | |
| // from 1 to 4 html playback is adjusted | |
| if (j >= 1 && j <= 4) { | |
| console.log('playbackRate=' + j); | |
| getVideo().playbackRate = j; | |
| getVideo().play(); | |
| } | |
| // lower than zero or higher than 4 | |
| // implements a jump and wait seek | |
| if (j < 0 || j > 4) { | |
| var interv = 0; // playing interval before jog | |
| var s = 0; // the increase seek position | |
| if (j > 0) { | |
| s = j / 2; | |
| interv = 50; | |
| } else { | |
| s = j / 2; | |
| interv = 50; | |
| } | |
| console.log('jumping=' + j); | |
| getVideo().playbackRate = 1; | |
| getVideo().play(); // better user xp | |
| setTimeout(function () { | |
| getVideo().currentTime += (s); // after jumping oncanplay will be fired | |
| }, interv); | |
| } | |
| } | |
| } | |
| getVideo().oncanplay = function() { | |
| // every time the video is repositioned try jog | |
| tryJog(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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