Получить первый кадр видео [закрыт]

Взято с https://stackoverflow.com/questions/3749011/capture-first-frame-of-an-embedded-video

// Create a video element.
var vid = document.createElement("video");
// We don't want it to start playing yet.
vid.autoplay = false;
vid.loop = false;
// No need for user to see the video itself.
vid.style.display = "none";
// This will fire when there's some data loaded for the video, should be at least 1 frame here.
vid.addEventListener("loadeddata", function()
{
    // Let's wait another 100ms just in case?
    setTimeout(function()
    {
        // Create a canvas element, this is what user sees.
        var canvas = document.createElement("canvas");
        // Set it to same dimensions as video.
        canvas.width = vid.videoWidth;
        canvas.height = vid.videoHeight;
        // Put it on page.
        document.getElementById("done").innerHTML = "";
        document.getElementById("done").appendChild(canvas);
        // Get the drawing context for canvas.
        var ctx = canvas.getContext("2d");
        // Draw the current frame of video onto canvas.
        ctx.drawImage(vid, 0, 0);
        // Done!
    });
}, false);
// Have to include .ogv for firefox. I don't think this is working atm because my webserver isn't serving up
// videos properly.
if(BrowserDetect.browser == "Firefox")
{
var source = document.createElement("source");
source.src = "BigBuckBunny_640x360.ogv";
source.type = "video/ogg";
vid.appendChild(source);
}
else
{
var source = document.createElement("source");
source.src = "BigBuckBunny_640x360.mp4";
source.type = "video/mp4";
vid.appendChild(source);
}
// Add video to document to start loading process now.
document.body.appendChild(vid);