我无法显示video/image
已加载的预览
基本上我的意思是说下面的代码不是触发来获得video/image
预览
这是我的Jsfiddle
.bind('fileuploadprocessalways', function(e, data)
{
var canvas = data.files[0].preview;
var dataURL = canvas.toDataURL();
$("#some-image").css("background-image", 'url(' + dataURL +')');
})
问题:请帮我预览video/image
正在上传
这是我的完整代码
HTML:
<input id="fileupload" type="file" name="files[]" multiple>
<div class="progress">
<div class="meter" style="width: 0%;"></div>
</div>
<div class="data"></div>
<div id="some-image"></div>
的javascript:
$(function () {
$('#fileupload').fileupload({
url: '/echo/json/',
maxChunkSize: 1048576,
maxRetries: 3,
dataType: 'json',
multipart: false,
progressall: function (e, data) {
//progress
},
add: function (e, data) {
data.context = $('<p/>').text('Uploading...').appendTo('.data');
data.submit();
},
done: function (e, data) {
data.context.text('Upload finished.');
},
fail: function (e, data) {
data.context.text('Upload failed.');
}
}).bind('fileuploadprocessalways', function(e, data)
{
var canvas = data.files[0].preview;
var dataURL = canvas.toDataURL();
$("#some-image").css("background-image", 'url(' + dataURL +')');
})
});
答案 0 :(得分:4)
以下是如何使用jQuery捕获视频缩略图的示例。我们的想法是使用fileupload,然后使用video
元素加载视频,将视频currentTime设置为一些随机时间以获取缩略图并使用canvas
绘制视频。
$(function() {
var video = $("video");
var thumbnail = $("canvas");
var input = $("input[type=file]");
var ctx = thumbnail.get(0).getContext("2d");
var duration = 0;
var img = $("img");
input.on("change", function(e) {
var file = e.target.files[0];
// Validate video file type
if (["video/mp4"].indexOf(file.type) === -1) {
alert("Only 'MP4' video format allowed.");
return;
}
// Set video source
video.find("source").attr("src", URL.createObjectURL(file));
// Load the video
video.get(0).load();
// Load metadata of the video to get video duration and dimensions
video.on("loadedmetadata", function(e) {
duration = video.get(0).duration;
// Set canvas dimensions same as video dimensions
thumbnail[0].width = video[0].videoWidth;
thumbnail[0].height = video[0].videoHeight;
// Set video current time to get some random image
video[0].currentTime = Math.ceil(duration / 2);
// Draw the base-64 encoded image data when the time updates
video.one("timeupdate", function() {
ctx.drawImage(video[0], 0, 0, video[0].videoWidth, video[0].videoHeight);
img.attr("src", thumbnail[0].toDataURL());
});
});
});
});
&#13;
video, canvas {
display: none;
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="file" accept="video/mp4" />
<video controls>
<source type="video/mp4">
</video>
<canvas></canvas>
<br/>
<img/>
&#13;
要确定是否可以播放指定的媒体类型,您可以使用以下代码:
var obj = document.createElement("video");
console.info("video/avi: ", obj.canPlayType("video/avi") || "no");
console.info("video/mp4: ", obj.canPlayType("video/mp4"));
&#13;
可能的值是:
"probably"
:指定的媒体类型似乎可播放。"maybe"
:无法判断媒体类型是否可播放。""
:无法播放指定的媒体类型。答案 1 :(得分:0)
我认为是这样。
<input id="fileupload" type="file" name="files[]" multiple>
<div class="progress">
<div class="meter" style="width: 0%;"></div>
</div>
<div class="data"></div>
<div id="some-image">
<img id="uAvata" alt="" />
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$("#fileupload").change(function(evt) {
var fileUpload = $(this).get(0).files;
readURL(this, "#uAvata");
});
//Preview image
function readURL(inputFile, imgId) {
if (inputFile.files && inputFile.files[0]) {
var reader = new FileReader();
reader.onload = function(e) {
$(imgId).attr('src', e.target.result);
}
reader.readAsDataURL(inputFile.files[0]);
}
}
// Preview video will read video like: @xxxmatko
</script>