function changeVideoSource(blob, videoElement, videoBox) {
    videoBox = videoBox || "";
    var blobUrl = URL.createObjectURL(blob);
    videoElement.src = blobUrl;
    $(videoElement).show();
    if (!isnavigated) {
        isnavigated = true;
        if (getint(_psec[_pseq - 1]) > 0) {
            videoElement.currentTime = getint(_psec[_pseq - 1]);
        } else {
            //videoElement.play();
        }
    } else {
        //videoElement.play();
    }
    if (videoBox != "") {
        videoBox.show();
    }
    $("#loading").hide();
    if ($("#prenextbox").length > 0) {
        $("#prenextbox").show();
    }
}
function fetchVideo(url) {
    return fetch(url).then(function (response) {
        return response.blob();
    });
}