I'm trying to use html5 audio with Dart and Chrome, and I'm going the easy way of using AudioElement as much as possible. I want to be able to pause sound and resume it later. I have:
startSound() {
audioElement.src = "foo";
audioElement.load();
audioElement.play();
}
pause() {
this.time = audioElement.currentTime;
audioElement.pause();
}
unpause() {
audioElement.currentTime = this.time;
audioElement.play();
}
These are hooked up to event handlers, so when someone clicks the 'pause' button, playback stops. When they hit the 'resume' button, though, playback resumes for only about half a second before stopping again.
How do I get audio to resume properly?
There appears to be a timing issue in Chrome. You need to tell Chrome to play, then pause again, then play again, with a short delay between each.
A working version of the unpause method is:
unpause() {
var fn = () {
audioElement.currentTime = this.time;
audioElement.play();
};
fn();
window.setTimeout(() => audioElement.pause(), 25);
window.setTimeout(fn, 50);
}
I had a similar problem with Chrome. It stuttered before playing when I "resumed" the audio element, and I didn't have the same problem in Safari. It turned out, however, that Chrome was somehow not happy with my mp3 format. Adding an ogg version of the file to the sources in my tag solved the problem.
Related
I have a flash video that is short, has sound, and I've got Play Pause and Stop buttons.
Without sound, it works perfectly. It autoplays, you can hit pause and it pauses, and play resumes where it leaves off. Hitting stop goes to an empty frame if someone wants to turn it off.
I have audio inside my library, and would like connect the audio with the same elements. I've been researching for awhile now, and I've not come up with a solution yet, and having a hard time.
Here is my ActionScript code for my currently working buttons:
StopBtn.addEventListener(MouseEvent.CLICK, stopplaying);
function stopplaying(Event:MouseEvent):void {
stop()
}
PlayBtn.addEventListener(MouseEvent.CLICK, startplaying);
function startplaying(Event:MouseEvent):void {
play()
}
CloseBtn.addEventListener(MouseEvent.CLICK, close);
function close(Event:MouseEvent):void {
gotoAndStop(240)
}
You should use Sound and SoundChannel to do this. And for pause you'll have to save the current play position so that you can continue from there:
var audio:Sound = new audioFromLibrary(); //linkage name
var soundChannel:SoundChannel = new SoundChannel();
var audioPosition:Number = 0;
//PLAY:
soundChannel = audio.play(audioPosition);
//PAUSE:
audioPosition = soundChannel.position;
soundChannel.stop();
//STOP:
soundChannel.stop();
I am playing a small audio clip on click of each link in my navigation
HTML Code:
<audio tabindex="0" id="beep-one" controls preload="auto" >
<source src="audio/Output 1-2.mp3">
<source src="audio/Output 1-2.ogg">
</audio>
JS code:
$('#links a').click(function(e) {
e.preventDefault();
var beepOne = $("#beep-one")[0];
beepOne.play();
});
It's working fine so far.
Issue is when a sound clip is already running and i click on any link nothing happens.
I tried to stop the already playing sound on click of link, but there is no direct event for that in HTML5's Audio API
I tried following code but it's not working
$.each($('audio'), function () {
$(this).stop();
});
Any suggestions please?
Instead of stop() you could try with:
sound.pause();
sound.currentTime = 0;
This should have the desired effect.
first you have to set an id for your audio element
in your js :
var ply = document.getElementById('player');
var oldSrc = ply.src;// just to remember the old source
ply.src = "";// to stop the player you have to replace the source with nothing
I was having same issue. A stop should stop the stream and onplay go to live if it is a radio. All solutions I saw had a disadvantage:
player.currentTime = 0 keeps downloading the stream.
player.src = '' raise error event
My solution:
var player = document.getElementById('radio');
player.pause();
player.src = player.src;
And the HTML
<audio src="http://radio-stream" id="radio" class="hidden" preload="none"></audio>
Here is my way of doing stop() method:
Somewhere in code:
audioCh1: document.createElement("audio");
and then in stop():
this.audioCh1.pause()
this.audioCh1.src = 'data:audio/wav;base64,UklGRiQAAABXQVZFZm10IBAAAAABAAEAVFYAAFRWAAABAAgAZGF0YQAAAAA=';
In this way we don`t produce additional request, the old one is cancelled and our audio element is in clean state (tested in Chrome and FF) :>
This method works:
audio.pause();
audio.currentTime = 0;
But if you don't want to have to write these two lines of code every time you stop an audio you could do one of two things. The second I think is the more appropriate one and I'm not sure why the "gods of javascript standards" have not made this standard.
First method: create a function and pass the audio
function stopAudio(audio) {
audio.pause();
audio.currentTime = 0;
}
//then using it:
stopAudio(audio);
Second method (favoured): extend the Audio class:
Audio.prototype.stop = function() {
this.pause();
this.currentTime = 0;
};
I have this in a javascript file I called "AudioPlus.js" which I include in my html before any script that will be dealing with audio.
Then you can call the stop function on audio objects:
audio.stop();
FINALLY CHROME ISSUE WITH "canplaythrough":
I have not tested this in all browsers but this is a problem I came across in Chrome. If you try to set currentTime on an audio that has a "canplaythrough" event listener attached to it then you will trigger that event again which can lead to undesirable results.
So the solution, similar to all cases when you have attached an event listener that you really want to make sure it is not triggered again, is to remove the event listener after the first call. Something like this:
//note using jquery to attach the event. You can use plain javascript as well of course.
$(audio).on("canplaythrough", function() {
$(this).off("canplaythrough");
// rest of the code ...
});
BONUS:
Note that you can add even more custom methods to the Audio class (or any native javascript class for that matter).
For example if you wanted a "restart" method that restarted the audio it could look something like:
Audio.prototype.restart= function() {
this.pause();
this.currentTime = 0;
this.play();
};
It doesn't work sometimes in chrome,
sound.pause();
sound.currentTime = 0;
just change like that,
sound.currentTime = 0;
sound.pause();
From my own javascript function to toggle Play/Pause - since I'm handling a radio stream, I wanted it to clear the buffer so that the listener does not end up coming out of sync with the radio station.
function playStream() {
var player = document.getElementById('player');
(player.paused == true) ? toggle(0) : toggle(1);
}
function toggle(state) {
var player = document.getElementById('player');
var link = document.getElementById('radio-link');
var src = "http://192.81.248.91:8159/;";
switch(state) {
case 0:
player.src = src;
player.load();
player.play();
link.innerHTML = 'Pause';
player_state = 1;
break;
case 1:
player.pause();
player.currentTime = 0;
player.src = '';
link.innerHTML = 'Play';
player_state = 0;
break;
}
}
Turns out, just clearing the currentTime doesn't cut it under Chrome, needed to clear the source too and load it back in. Hope this helps.
As a side note and because I was recently using the stop method provided in the accepted answer, according to this link:
https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Media_events
by setting currentTime manually one may fire the 'canplaythrough' event on the audio element. In the link it mentions Firefox, but I encountered this event firing after setting currentTime manually on Chrome. So if you have behavior attached to this event you might end up in an audio loop.
shamangeorge wrote:
by setting currentTime manually one may fire the 'canplaythrough' event on the audio element.
This is indeed what will happen, and pausing will also trigger the pause event, both of which make this technique unsuitable for use as a "stop" method. Moreover, setting the src as suggested by zaki will make the player try to load the current page's URL as a media file (and fail) if autoplay is enabled - setting src to null is not allowed; it will always be treated as a URL. Short of destroying the player object there seems to be no good way of providing a "stop" method, so I would suggest just dropping the dedicated stop button and providing pause and skip back buttons instead - a stop button wouldn't really add any functionality.
This approach is "brute force", but it works assuming using jQuery is "allowed". Surround your "player" <audio></audio> tags with a div (here with an id of "plHolder").
<div id="plHolder">
<audio controls id="player">
...
</audio>
<div>
Then this javascript should work:
function stopAudio() {
var savePlayer = $('#plHolder').html(); // Save player code
$('#player').remove(); // Remove player from DOM
$('#FlHolder').html(savePlayer); // Restore it
}
I was looking for something similar due to making an application that could be used to layer sounds with each other for focus. What I ended up doing was - when selecting a sound, create the audio element with Javascript:
const audio = document.createElement('audio') as HTMLAudioElement;
audio.src = getSoundURL(clickedTrackId);
audio.id = `${clickedTrackId}-audio`;
console.log(audio.id);
audio.volume = 20/100;
audio.load();
audio.play();
Then, append child to document to actually surface the audio element
document.body.appendChild(audio);
Finally, when unselecting audio, you can stop and remove the audio element altogether - this will also stop streaming.
const audio = document.getElementById(`${clickedTrackId}-audio`) as HTMLAudioElement;
audio.pause();
audio.remove();
If you have several audio players on your site and you like to pause all of them:
$('audio').each( function() {
$(this)[0].pause();
});
I believe it would be good to check if the audio is playing state and reset the currentTime property.
if (sound.currentTime !== 0 && (sound.currentTime > 0 && sound.currentTime < sound.duration) {
sound.currentTime = 0;
}
sound.play();
for me that code working fine. (IE10+)
var Wmp = document.getElementById("MediaPlayer");
Wmp.controls.stop();
<object classid="clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6"
standby="Loading áudio..." style="width: 100%; height: 170px" id="MediaPlayer">...
Hope this help.
What I like to do is completely remove the control using Angular2 then it's reloaded when the next song has an audio path:
<audio id="audioplayer" *ngIf="song?.audio_path">
Then when I want to unload it in code I do this:
this.song = Object.assign({},this.song,{audio_path: null});
When the next song is assigned, the control gets completely recreated from scratch:
this.song = this.songOnDeck;
The simple way to get around this error is to catch the error.
audioElement.play() returns a promise, so the following code with a .catch() should suffice manage this issue:
function playSound(sound) {
sfx.pause();
sfx.currentTime = 0;
sfx.src = sound;
sfx.play().catch(e => e);
}
Note: You may want to replace the arrow function with an anonymous function for backward compatibility.
In IE 11 I used combined variant:
player.currentTime = 0;
player.pause();
player.currentTime = 0;
Only 2 times repeat prevents IE from continuing loading media stream after pause() and flooding a disk by that.
What's wrong with simply this?
audio.load()
As stated by the spec and on MDN, respectively:
Playback of any previously playing media resource for this element stops.
Calling load() aborts all ongoing operations involving this media element
I'm trying to find out what will be the size of the image I get from the webcam using getUserMedia.
Right now, in my Macbook, I have supposedly a 720p camera, but the image I'm getting is 640x480. I'm assuming this won't always be the case, though, and I'd like to be able to handle as many cameras as possible. (I care way more about aspect ratio than size itself, I just want to make sure pictures don't show up stretched)
Is it possible to do this?
Thank you!
Daniel
You should be able to use videoWidth and videoHeight attributes, like this:
// Check camera stream is playing by getting its width
video.addEventListener('playing', function() {
if (this.videoWidth === 0) {
console.error('videoWidth is 0. Camera not connected?');
}
}, false);
UPDATE: Actually, this works in Opera but doesn't seem to be supported in Chrome any more and hasn't been implemented in Firefox (at least not for video streams). It's in the HTML5 spec, though, so hopefully is on the roadmap for these browsers.
UPDATE 2: This does work, but the event to listen for is "playing" and not "play" (fixed in the code above). The "play" event is fired when the play() method is returned, whereas the "playing" event is fired when playback has actually started. Tested in Opera, Chrome and Firefox.
UPDATE 3: Firefox 18 seems to fire the "playing" event repeatedly, meaning the browser could grind to a halt if you're executing a lot of code within the listener. Better to remove the listener after it's fired, like so:
var videoWidth, videoHeight;
var getVideoSize = function() {
videoWidth = video.videoWidth;
videoHeight = video.videoHeight;
video.removeEventListener('playing', getVideoSize, false);
};
video.addEventListener('playing', getVideoSize, false);
Hooking into the playing event does not work in Firefox (at least in Firefox 26.0 on Ubuntu 12.04 LTS I use). The playing event fires once or twice after the video starts playing. videoWidth and videoHeight are either 0 or undefined when the playing event fires. A more reliable way to detect videoWidth and videoHeight is pausing and playing the video, that seems to work always. The code snippet below worked for me:
//Detect camera resolution using pause/play loop.
var retryCount = 0;
var retryLimit = 25;
var video = $('.video')[0]; //Using jquery to get the video element.
video.onplaying = function(e) {
var videoWidth = this.videoWidth;
var videoHeight = this.videoHeight;
if (!videoWidth || !videoHeight) {
if (retryCount < retryLimit) {
retryCount++;
window.setTimeout(function() {
video.pause();
video.play();
}, 100);
}
else {
video.onplaying = undefined; //Remove event handler.
console.log('Failed to detect camera resolution after ' + retryCount + ' retries. Giving up!');
}
}
else {
video.onplaying = undefined; //Remove event handler.
console.log('Detected camera resolution in ' + retryCount + ' retries.');
console.log('width:' + videoWidth + ', height:' + videoHeight);
}
};
I am playing looped FLVs in the "standard way":
netstream.addEventListener(NetStatusEvent.NET_STATUS, onStatus);
...
public function onStatus(item:Object):void {
if (item.info.code == "NetStream.Play.Stop") {
if (loop) netstream.seek(0);
}
When played through Flash CS 5.5 authoring tool (Test Movie or Debug Movie), the videos loop seamlessly. But! When played in the browser or standalone debug Flash player (both v.11.2.202.233) there is an abnormal pause of about 1 sec before the video "rewinds".
Is this a bug with the latest Flash player?
For People who have the same issue, try changing the aforementioned code to this:
public function onStatus(item:Object):void {
if (item.info.code == "NetStream.Buffer.Empty") {
if (loop) netstream.seek(0);
}
It will get rid of the flicker. If you listen to "NetStream.Play.Stop", it will cause a flicker.
You don't need to embed anything. This works just fine on IOS, Android and PC.
This is a known bug with Flash Player 11+ and AIR 3+. Bug report is here, and you should upvote & : https://bugbase.adobe.com/index.cfm?event=bug&id=3349340
Known workarounds that will create a seamless loop:
1) Embed the video in the SWF. Not ideal, and not possible in some cases.
2) Create dual NetSteam objects and switch between them. An example of the event fired when ns1, the first of two NetStreams objects, reaches it's end:
if (e.info.code == "NetStream.Play.Stop"){
vid.attachNetStream(ns2);
ns2.resume();
activeNs = ns2;
ns1.seek(0);
ns1.pause();
}
Replace ns1 with ns2 on the other event listener. A useless duplication of objects and handlers, but there you go.
3) Use AIR 2.x / Flash Player 10.x (not really a solution at all, except for Linux users)
We noticed this on the transition from Flash 10 to to Flash 11. Flash 10 loops seamlessly, but Flash 11 has a ~1 second stall when calling seek(0) from NetStream.Play.Stop.
Embedding the media in the SWF is not an option for us.
The following code provides a more seamless loop - still not perfect, but much better.
var mStream:NetStream;
var mDuration:Number;
...
addEventListener(Event.ENTER_FRAME, onEnterFrame);
...
function onEnterFrame(e:Event):void
{
if( mStream.time > (mDuration-0.05) )
{
if( mLooping )
{
mStream.seek(0);
}
}
}
function onMetaData(info:Object)
{
mDuration = info.duration;
}
Hope it helps.
I seem to have achieved this using an FLVPlayback component along with a few tips.
What's more, it's running seamlessly on desktop, iPhone 4S and 3GS! (via an AIR app)
_videoFLV = new FLVPlayback();
_videoFLV.fullScreenTakeOver = false;
_videoFLV.autoPlay = false;
_videoFLV.autoRewind = true;
_videoFLV.isLive = false;
_videoFLV.skin = null;
_videoFLV.y = 150;
_videoFLV.bufferTime = .1;
_videoFLV.width = 320;
_videoFLV.height = 320;
_videoFLV.addEventListener(MetadataEvent.CUE_POINT, video_cp_listener, false, 0, true);
_videoFLV.source = "includes/10sec.flv";
addChild(_videoFLV);
With the listener function...
function video_cp_listener(eventObject:MetadataEvent):void {
if (eventObject.info.name == "endpoint") {
_videoFLV.seek(0);
_videoFLV.play();
}
}
Importantly I think you must set the width and height to match your flv file. i.e. no scaling whatsoever.
The flv has a cue point named 'endpoint' added 1 frame before the end of the file (assuming your start and end frame are the same this will be required).I added this using Adobe Media Encoder.
The only way to loop an flv seamlessly is to embed inside the swf. It is converted to a MovieClip and you then handle it with play(), stop(), nextFrame(), prevFrame() etc.
When embedding in Flash Authoring tool (dragging flv file on stage), make sure that you select:
"Embed FLV in SWF..."
Symbol Type : "Movie clip"
All checked : "Place instance on stage", "Expand timeline...", "Include audio"
I have a 15 second video that's not embedded (it's sourced from an url). How can I get it to play the next frame when then video is finished?
If you are using the FLVPlayback component, you can do it like this:
// for clarification
var video:FLVPlayback = myVideoInstance;
video.source = "http://example.com/myvideo.flv";
video.autoPlay = true;
video.addEventListener(VideoEvent.COMPLETE, function(e:VideoEvent) {
// video has finished
});
See VideoEvent.COMPLETE which is dispatched when a video has finished playing.
video.addEventListener(VideoEvent.COMPLETE, _doNext);
function _doNext(e:VideoEvent):void
{
video.removeEventListener(VideoEvent.COMPLETE, _doNext);
trace("video done, what's next?");
}