I've been looking for a solution where i can "scrub" through HTML5 video. I haven't found one yet and was about to start writing my own. But before i do that, i thought it would make some sense to run it past SO first.
Before we get into my approach, see this:
http://www.kokokaka.com/demo/bluebell_ss10/site
This site of course is built in Flash but serves as an example of what i would like to achieve using HTML5.
I've experimented with the playbackRate (-1) attribute on the video tag without much luck. I suspect this is because the encoding (ogg, mp4, vp8) are better suited to forward playback.
with this, i see two possible approaches:
create two videos, one for forward play, and another for backwards play. this of course doubles the size of any videos which is not ideal.
split the video into individual jpg frames and swap out the images. This would mean i have no sound, but in my particular application, this is not an issue.
I feel that the second option is the best suited for my particular application and allows for some flexibility in playback. What do you think?
Generate a bunch of thumbnails of your video by any means.
Once you have all of your thumbs from the video, you could use something like this, which detects mouse movement and replaces the thumbnail based on the movement -- hover scrubbing.
Example 1: http://codepen.io/simsketch/pen/gwJBRg
Example 2: http://jsfiddle.net/simsketch/x4ko1x1w/
or for something less verbose, if you want to horizontally concatenate all the thumbnail images into a sprite, you can use this, another beautiful example of the hover scrub.
http://jsfiddle.net/simsketch/r6wz0nz6/152/
but you would need to bind the event to mousedown instead of mousemove
this doesn't really give you the desired effect so you would need to combine mousedown and mousemove as is suggested here: https://stackoverflow.com/a/1572688/1579789
this would somewhat give you the effect you're looking for, but without using HTML5 video, and without sound.
however, you could add sound as well if you bind the mouse movement to a timecode in the audio track i suppose. at that point, you could probably just as easily manipulate a video track instead.
i think what you want can be done with popcornjs, available at popcornjs.org
I happened to find this question today after the featured story on the Google homepage was this, which features a video scrubber.
I'd never seen a video scrubber before and was blown away!
Then I found https://www.emergeinteractive.com/demos/javascript-video-scrubber/, which describes how to achieve it.
These folks may have invented this concept for Nike years ago.
They offer a code snippet and a link to Github:
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
(function animloop(){
requestAnimFrame(animloop);
targetStep = Math.max( Math.round( getYOffset() / 30 ) , 1 ); // what frame to animate to
if(targetStep != step ) { step += (targetStep - step) / 5; } // increment the step until we arrive at the target step
changeFrame();
})();
function changeFrame() {
var thisStep = Math.round(step); // calculate the frame number
if(images.length > 0 && images[thisStep]) { // if the image exists in the array
if(images[thisStep].complete) { // if the image is downloaded and ready
$('#video').attr('src',images[thisStep].src); // change the source of our placeholder image
}
}
}
Related
I've been trying to solve this for several time, but I'm now pointless with this situation. I'm creating a HTML5 canvas project in Flash CC, I'm kinda new in JS (not difficult BTW), the point is, I have around 10 keyframes inside my main timeline, and some classic buttons, all I need to do is to navigate inside every frame when a button is pressed (pretty easy uh!) the trouble is, the first frame works perfectly, but from 2 to the others, I can't be able to use buttons, interactivity is being programmed as follows:
var self = this;
this.stop();
this.btn4.addEventListener("click", clickUno);
function clickUno() {
self.gotoAndPlay(1);
}
Any help will be really appreciated, I just don't know why 1st frame works great, but others doesn't!
I had similar issues with canvas with flash.
I needed to created completed new buttons on every instance you need a button to get code to work. (ODD I know.)
Button code.
this.getinsideIt.addEventListener("click", fl_ClickToGoToAndPlayFromFrame_9.bind(this));
function fl_ClickToGoToAndPlayFromFrame_9()
{
this.Mygreatmovie.gotoAndPlay(350);
}
As I understand, you need a button, clicking on which proceeds your animation 1 frame at a time. Correct?
You should make use of the currentFrame and totalFrames properties of the main stage for this. Query the current frame and move on to next!
var self = this;
this.stop();
if(!this.btn4.hasEventListener("click", clickUno))
this.btn4.addEventListener("click", clickUno);
function clickUno(e) {
var curr = self.currentFrame;
var total = self.totalFrames;
self.gotoAndStop((curr + 1)%total);
}
We are trying to build an HTML game in which abobe edge is being used for animations and those animations are being inserted into iframes. We are trying to preload the iframes before removing the 'loading screen' so that the users won't see blank iframes initially.
Here is the code for loading the iframes.
We have a global variable var middleBotLoaded = false;
The following function tries to dynamically populate the iframe and once the iframe has loaded , we are assigning the variable to true
function _trackIFrameLoading()
{
if (document.getElementById("botzmiddleidlesequence_iframe").attachEvent)
{
document.getElementById("botzmiddleidlesequence_iframe").attachEvent("onload", function() { middleBotLoaded = true; });
}
else
{
document.getElementById("botzmiddleidlesequence_iframe").onload = function() { middleBotLoaded = true; };
}
document.getElementById("botzmiddleidlesequence_iframe").src = APP_BASE_URL + "blitzbotzidlesequence/blitzbotz/"+middleBotzId;
}
We have a method to check if the global variable has become true and if so , we are removing the loading screen.The method is being called in a interval of 500 milliseconds
setTimeout(_haveAllCharactersLoaded,500);
function _haveAllCharactersLoaded()
{
if(middleBotLoaded == true)
{
$(jOverlay).fadeOut(800, function() {
$(jOverlay).remove();
});
}
else
{
setTimeout(_haveAllCharactersLoaded,500);
}
}
The problem is that even after the loading screen disappears , the iframe contents take time to come up on the screen .
We have observed that the duration depends on the speed of the net connection , but then , isn't using onload the whole point of making sure that the contents have loaded.
Is there any other approach for dealing with this problem.
Thanks.
EDIT : I have to wait for two days before I can start a bounty but I am willing to award it to anyone who can provide a canonical answer to the question.
I have two answers here.
First, I think you should reconsider the way you're coding this game, unless it's a static, turn based game that only relies upon animations (think Pokemon.)
Second, I have a suggestion for you to try in fixing your code.
First Answer:
You asked if there is any other approach to dealing with this problem.
My first reaction to that, would be to skip using iFrames entirely. Adobe Edge may provide you with a good way to craft animations, but for use in a game engine you will only find yourself fighting against the design of how Adobe Edge handles it's animations.
Instead, I would recommend learning how to use HTML5's canvas element. Canvas is built to handle dynamically loaded content (such as your game engine will be generating.) I can only imagine the event of having particle effect animation overlayed onto a game character as he is hit by a weapon. With your current approach, would you place that in an iFrame? Then, how would you ensure that this particle effect is placed on the correct location on the object?
There are many resources out there to help you begin learning the code you need to make a true game engine in the browser. I would recommend beginning by learning how Canvas works. If you want to animate using the DOM, learn about requestAnimationFrame.
http://creativejs.com/
http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Canvas_tutorial
Second Answer:
I would recommend looking into the variable scope of your middleBotLoaded. This answer (Set variable in parent window from iframe) would be a good place to look.
Instead of using document.getElementById("botzmiddleidlesequence_iframe").attachEvent("onload", function() { middleBotLoaded = true; });
try using document.getElementById("botzmiddleidlesequence_iframe").attachEvent("onload", function() { parent.middleBotLoaded = true; });
Alternatively, try something along these lines:
onLoad event:
document.getElementById("botzmiddleidlesequence_iframe").attachEvent("onload", function() { parent.middleBotLoaded();});
Function to handle loading:
function middleBotLoaded()
{
$(jOverlay).fadeOut(800, function() {
$(jOverlay).remove();
});
}
It's a better practice to directly call an event, rather than polling for variable changes using setTimeout.
I am researching setting up a script that will show certain notes along with accompanying music tracks. Basically I need certain times in the audio track to trigger events. I have seen I could use the currentTime similar to the following, but I am getting hung up on a good way to make a concise function to move between frames and move back and firth if there is a rewind etc. Help's appreciated greatly!
$("#ogg_player_1_obj").bind('timeupdate', notePosition);
function notePosition(){
myVid=document.getElementById("ogg_player_1_obj");
mct=myVid.currentTime;
//SET Frame based on time???
}
function notePosition(){
//your code.
if(frame1start <= mct && frame1end >= mct) {
$(".frame").fadeOut(100);
$("#frame1").fadeIn(100);
}
//and again for every frame.
}
This works if you put every frame in a seperate element with class frame and the id frame + number.
Is it possible to seek to a particular point in html5 video displayed in a web page? I mean ,can I input a particular time value (say 01:20:30:045 ) and have the player control (slider) move to that point and play from that point onwards?
In older version of mozilla vlcplugin I think this is possible by seek(seconds,is_relative) method..but I would like to know if this is possible in html video.
Edit:
I created the page with video and added javascript as below.When I click on the link ,it displays the time of click..but it doesn't increment the play location..but continues to play normally.
Shouldn't the video play location get changed?
html
<video id="vid" width="640" height="360" controls>
<source src="/myvid/test.mp4" type="video/mp4" />
</video>
<a id="gettime" href="#">time</a>
<p>
you clicked at:<span id="showtime"> </span>
</p>
javascript
$(document).ready(function(){
var player = $('#vid').get(0);
$('#gettime').click(function(){
if(player){
current_time=player.currentTime;
$('#showtime').html(current_time+" seconds");
player.currentTime=current_time+10;
}
});
}
);
You can use v.currentTime = seconds; to seek to a given position.
Reference: https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/currentTime
Unfortunately it seems with some movie elements it behaves differently than others. For instance with an amazon video_element, it seems you must call pause before you can seek anywhere, then call play. However, if you call play "too quickly" after setting the currentTime then it won't stick. Odd.
Here is my current work around:
function seekToTime(ts) {
// try and avoid pauses after seeking
video_element.pause();
video_element.currentTime = ts; // if this is far enough away from current, it implies a "play" call as well...oddly. I mean seriously that is junk.
// however if it close enough, then we need to call play manually
// some shenanigans to try and work around this:
var timer = setInterval(function() {
if (video_element.paused && video_element.readyState ==4 || !video_element.paused) {
video_element.play();
clearInterval(timer);
}
}, 50);
}
Top answer is outdated.
You can still use:
this.video.currentTime = 10 // seconds
But now you also have:
this.video.faskSeek(10) // seconds
The docs provide the following warnings regarding the fastSeek method:
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The HTMLMediaElement.fastSeek() method quickly seeks the media to the new time with precision tradeoff.
If you need to seek with precision, you should set HTMLMediaElement.currentTime instead.
https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/fastSeek
Based on the above I guess the following is best if cross browser compatibility and performance are your top priority:
const seek = secs => {
if (this.video.fastSeek) {
this.video.fastSeek(secs)
} else {
this.video.currentTime = secs
}
}
seek(10)
If you prefer accuracy over performance then stick with:
this.video.currentTime = secs
At the time of writing faskSeek is only rolled out to Safari and Firefox but expect this to change. Check the compatibility table at the above link for the latest info on browser compatibility.
Is it possible to set the loop count of a GIF image using JavaScript and then publish an event when it stops playing?
For example something like:
//html code
<img src="myImage.gif" id="img1"/>
//Javascript code
var image = document.getElementById('img1');
//Image must stop playing after 3 loops
image.setLoopCount = 3;
here is how i would suggest doing it:
extract frames form gif file (you can do it online using for instace -> http://imgops.com/)
use javascript to change pictures, simulating animation (that way you can keep track of how many loops you have done)
Here is a jsFiddle link http://jsfiddle.net/qustosh/n5zWH/9/
I used jQuery. I did three loops and i threw a callback function at the end.
For a design side solution, you can set the GIF image to only loop a certain number of times with Photoshop. Then just use window.setTimeout(callback, milliseconds) to trigger your custom event.
You can calculate the time out from the interval used to display each frame of the animation.