I want to develop a mobile app for image capturing with camera, initially i wanted to use phonegap and tried downloading and installing the cordovastarter template for my visual studio2010, but all the versiosn of phonegap are giving me the error...'the project type is not supported by this installation' so want to drop the idea of using phonegap, so the next thing is, is it possible to interact with camera using by using only html5 without the help of phonegap?
note:im using mvc3 framework
its very much posible to interact with the camera using HTML5 media API, but the support is not yet confirmed. Hence, might not work as you'd expect:
HTML part:
<video id="video" width="640" height="480" autoplay></video>
<button id="snap">Snap Photo</button>
<canvas id="canvas" width="640" height="480"></canvas>
and the javascript goes like this:
// Put event listeners into place
window.addEventListener("DOMContentLoaded", function() {
// Grab elements, create settings, etc.
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
video = document.getElementById("video"),
videoObj = { "video": true },
errBack = function(error) {
console.log("Video capture error: ", error.code);
};
// Put video listeners into place
if(navigator.getUserMedia) { // Standard
navigator.getUserMedia(videoObj, function(stream) {
video.src = stream;
video.play();
}, errBack);
} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
navigator.webkitGetUserMedia(videoObj, function(stream){
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
}}, false);
Hope it helps, source here.
Related
I am trying to make a site like office 365 PowerPoint. I started using React konva. I got stucked on adding audio file to konva stage with new layer. I searched alot butcan't found solution. I should be able to add an audio file and adjust its volume.
You don't need react-konva for that. react-konva can be used to visualize your page.
For the sound, you can just create <audio /> element outside of canvas <Stage/> and controls its volume.
const Audio = ({ src, isPlaying }) => {
const audioRef = React.useRef(null);
React.useEffect(() => {
if (isPlaying) {
audioRef.current.play();
} else {
audioRef.current.pause();
}
});
return <audio src={src} ref={audioRef} />;
};
I'm building phonegap app and I need to play video in it. I know in order to play video on Android, I need to use one of the plugins available, but to play video on iOS, I can use HTML 5 video tag. I have these lines of code:
<div id="video">
<video id="video01" width="300" height="300" controls>
<source src="images/test2.mp4" type="video/mp4" />
</video>
</div>
I can see "video box", but I cannot play video for some reason. In console I don't see any errors.
Video I'm using is from this page: http://www.quirksmode.org/html5/tests/video.html
And in iPhone Safari I can load MP4 version from that page without any problems.
I know it has been a while, but I was looking at some of my old questions, and I've noticed that I completely forgot to post solution to my problem.
In the end I've managed to fix the issue using Cordova File api, and solution looks smth. like this:
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fileSystem) {
console.log("gotFS");
getFolder(fileSystem, "video", function(folder) {
filePath = folder.toURL() + "\/" + "videotest.mp4";
playVideo(filePath);
}, function() {
console.log("failed to get folder");
});
},
function() {
console.log("failed to get filesystem");
});
function playVideo(uri) {
var player = document.getElementById("videoPlayer");
var source = document.createElement("source");
source.src = uri;
source.type = "video/mp4";
player.appendChild(source);
player.load();
}
I have noticed many similar posts about this issue but after reading through them I don't seem to have found my answer.
I want a "view" in my JQM PhoneGap app to take a picture from camera or Photo Library and insert it into the view/screen and also save it to local storage.
When a user exits the app session and removes the application from processes running on the phone (i.e. iOS double tap home button and swipe up on application to remove its processes) - I want the data to persist so that it will be retrieved from Local Storage and the last captured image be visible when the app is opened again and user navigates to the specific view/screen. The existing image can be overwritten with a new one.
I have followed the posting by Jérôme # Capturing and storing a picture taken with the Camera into a local database / PhoneGap / Cordova / iOS and it captures and displays the image OK. But when I remove the app from running on my iPhone and restart it, it does not retrieve the last captured image from Local Storage.
Perhaps there is something that I am missing here? Here is the code for the whole page (bear in mind this is one page of a single page app, everything is combined into 'index.html':
<div id="Ccamera-fun" data-role="page" data-title="Camera Fun Activity">
<header data-role="header" data-theme="e" data-position="fixed">
Back
<h1>3.5 years - 4.5 years</h1>
</header>
<div data-role="content" data-theme="a" class="content">
<h1>Camera Fun</h1>
<div id="imageContainer"></div>
<img width="99%" id="imgProfile" src="" />
<p>Use your photos and ask your child to describe one in detail. Use your photos as picture talks where your child can share their memories and recall events before or after the photo was taken. <strong>Together you could invent their own story.</strong></p>
<p>Use the buttons below to take a picture with your phone or select an image from your phone’s Photo Library. Once you have selected a photo, it will be embedded into the top of this screen.</p>
<script type="text/javascript" charset="utf-8">
// A button will call this function
//
function takePhoto() {
sessionStorage.removeItem('imagepath');
// Take picture using device camera and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50, destinationType: Camera.DestinationType.FILE_URI });
}
function onPhotoDataSuccess(imageURI) {
// Uncomment to view the base64 encoded image data
// console.log(imageData);
// Get image handle
//
var imgProfile = document.getElementById('imgProfile');
// Show the captured photo
// The inline CSS rules are used to resize the image
//
imgProfile.src = imageURI;
imgProfile.style.display = 'block';
imgProfile.style.border = '2px solid #ccc';
imgProfile.style.marginTop = '10px';
if(sessionStorage.isprofileimage==1){
getLocation();
}
movePic(imageURI);
}
// Called if something bad happens.
//
function onFail(message) {
alert('Failed because: ' + message);
}
function movePic(file){
window.resolveLocalFileSystemURI(file, resolveOnSuccess, resOnError);
}
//Callback function when the file system uri has been resolved
function resolveOnSuccess(entry){
var d = new Date();
var n = d.getTime();
//new file name
var newFileName = n + ".jpg";
var myFolderApp = "MyAppFolder";
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSys) {
//The folder is created if doesn't exist
fileSys.root.getDirectory( myFolderApp,
{create:true, exclusive: false},
function(directory) {
entry.moveTo(directory, newFileName, successMove, resOnError);
},
resOnError);
},
resOnError);
}
//Callback function when the file has been moved successfully - inserting the complete path
function successMove(entry) {
//Store imagepath in session for future use
// like to store it in database
sessionStorage.setItem('imagepath', entry.fullPath);
}
function resOnError(error) {
alert(error.code);
}
</script>
<button onclick="takePhoto();" data-theme="h">Take a Picture</button>
</p>
<p><img src="img/DETE-footer.png" width="320" class="footer" /></p>
</div>
</div>
based on what I have received in http://pastebin.com/4gE2D00a
You save you image path with sessionStorage.setItem('imagepath', entry.fullPath);#2320 line. To read this value you should use sessionStorage.getItem('imagepath') check what you have in this variable with alert or console.log right after cordova initialization #24
Now, if everything is right before this step, you should have path of last image. To read file from filesystem- study FileReader api
Trying to get a YouTube video playing on Chromecast, not using the YouTube receiver but simply the iframe YouTube api. When the receiver url is loaded in a desktop chrome browser it plays ok but when the same url is loaded onto Chromecast I get the message 'This video is currently unavailable - Learn More'. If I keep trying to get the widget, once created, to play different videos it sometimes also says 'The Adobe Flash Player is required for video playback'.
The widget is created in the onYouTubeIframeAPIReady() callback using new YT.Player as shown in the docs. Maybe I'm confused but I thought the iframe api was html5 based, not flash based. Has anyone successfully achieved this or is this unsupported on Chromecast, hence the weird behaviour? I also stumbled across this http://www.youtube.com/html5
Here's the code I'm currently using on my receiver. The message handling (both directions) is hit and miss, and I'm currently working through that ... but the loading of the iFrame library, the embedding of the video, etc. all works. If it doesn't work on your end, we can start to investigate how your setup might be different. I've tried to add comments where it might be helpful.
<html>
<head>
<script src="https://www.gstatic.com/cast/js/receiver/1.0/cast_receiver.js">
</script>
<script type="text/javascript">
// first create our receiver object and our channel handler
var receiver = new cast.receiver.Receiver('{YOUR_APP_ID}', ['ChromecastYoutube'],"",5);
var ytChannelHandler = new cast.receiver.ChannelHandler('ChromecastYoutube'); // 'using 'ChromecastYoutube' as my dev namespace. Wouldn't really be that in production.
ytChannelHandler.addChannelFactory(receiver.createChannelFactory('ChromecastYoutube'));
ytChannelHandler.addEventListener(
cast.receiver.Channel.EventType.MESSAGE,
onMessage.bind(this)
);
receiver.start();
window.addEventListener('load', function() { // we won't try to load the iframe libraries until the chromecast window is fully loaded.
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
});
var player;
function onYouTubeIframeAPIReady() {
player = new YT.Player('player', {
height: '562',
width: '1000',
videoId: 'jLlSqucqXB0',
playerVars: { 'autoplay': 0, 'controls': 0 },
events: {
'onReady': onPlayerReady,
'onPlayerStateChange': onStateChange
}
});
}
function onPlayerReady(event) {
document.getElementById('annotation').innerHTML="We're ready to go";
}
function onStateChange(event) {
switch (event.data) {
case YT.PlayerState.ENDED:
// TODO let sender know we're done, then close casting
break;
case YT.PlayerState.PLAYING:
// TODO let sender know we're playing
break;
case YT.PlayerState.PAUSED:
// TODO let sender know we're paused
break;
}
}
function onMessage(event) { // currently, any one of these will work, but subsequent ones seem to falter. Investigating...
ytBindings={"playVideo":player.playVideo(),"pauseVideo":player.pauseVideo(),"stopVideo":player.stopVideo(),"getStatus":player.getPlayerState()}
ytBindings[event.message];
}
</script>
<style>
#wrapper {
width: 1000px;
margin: 10px auto;
text-align: center;
}
#annotation {
color: #ffffcc;
font-size: 200%;
margin-top:25px;
}
</style>
</head>
<body>
<div id="wrapper">
<div id="player"></div>
<div id="annotation"></div>
</div>
</body>
</html>
Current behavior: it now seems to be fixed with Chromecast firmware 16041 and if the country code is set correctly during Chromecast setup. See the latest comment here https://code.google.com/p/gdata-issues/issues/detail?id=5923
Old answer:
Here is the root cause of the issue: https://support.google.com/chromecast/answer/2995235?hl=en
Some videos may not play using Chromecast. Private videos, live content, and videos not approved for mobile playback will not work with Chromecast.
Hopefully this will change, kills a primary Chromecast use case.
I also ran into this issue and found the cause to be the fact that I was using html5 audio to play some sound effects just before the video began. Removing the sound effects made the youtube player work again.
I have an iPad app developed using a 3rd party tool called OpenPlug which converts AS3 to C++ and from there on exports to iOS. (Just wanted to note this is not a "native" app using Obj-C in XCode written by me, I wrote AS3)
Now I have this iPad application which displays pictures and video in a slideshow. For the video I'm using a WebView which loads a HTML page where I change the src property of the video object to the location of the video file which was downloaded to my application storage. This is working fine except that the application freezes when it is running for a few hours (3-6).
I searched for this problem and tried the solution in iOS Safari memory leak when loading/unloading HTML5 <video> but that does not seem to change anything for me.
Since the application freezes (right before the HTML page needs to load a video) and does not crash what does that mean? Do I need to destroy the video object? First I was creating a new WebView for each video but now I'm reusing the webview and just changing the src property but that also does not help me.
Can anyone shed some light on this? OpenPlug has discontinued it service and does not offer any support anymore but nevertheless I think it is more of a webview/video problem on iPad (?)
Important to note: The application is freezing but my iPad is not. The application does not generate a crash report and does not execute any code anymore (also no traces). When I push the Home button on my iPad and press the app icon then the application is restarted.
Here is the code of my HTML page which is refreshed every time a new video needs to start (webview.location = ...)
<html>
<head>
<script>
function videoEndedHandler(){
var video = document.getElementById("videoPlayer");
video.src = "";
video.load();
window.location.hash = "ended";
}
function videoErrorHandler(){
window.location.hash = "error";
var video = document.getElementById("videoPlayer");
video.src = "";
video.load();
}
var loop;
function setup(){
var video = document.getElementById("videoPlayer");
video.addEventListener("error", videoErrorHandler,false);
video.addEventListener("ended", videoEndedHandler,false);
video.load();
video.play();
startHashLoop();
}
function startHashLoop(){
if(window.location.hash == "#touched"){
setAsPaused();
}
if(window.location.hash == "#paused"){
//check image
testImage("shouldResume.png?nocache=" + Math.random());
}
if(window.location.hash == "#resume"){
var video = document.getElementById("videoPlayer");
video.play();
}
loop = setTimeout(hashLoop,500);
}
function testImage(url) {
var img = new Image;
img.addEventListener("load",isGood);
img.addEventListener("error",isBad);
img.src = url;
}
function isGood() {
window.location.hash = "resume";
}
function isBad() {
//alert("Image does not exist");
}
function hashLoop(){
startHashLoop();
}
function setAsTouched(){
window.location.hash = "touched";
}
function setAsPaused(){
var video = document.getElementById("videoPlayer");
video.pause();
window.location.hash = "paused";
}
</script>
</head>
<body onload="setup();" style="background-color:#000000;">
<video id="videoPlayer" style="top:0;left:0;position:absolute;" width="100%" height="100%" preload="auto" src="##VIDEO_URL##" autoplay="autoplay" webkit-playsinline />
</body>
</html>
It would be helpful if you'd post your entire code, but I think it's freezing because you're loading a video from web in your main thread, which is also responsible for redrawing UI. By loading a large video inside your thread, your UI freezes as well.
I would recommend moving the code that does video loading into a separate thread (use blocks if you're on iOS5).