var _ffmpegLoaded = false;
    var _ffmpegInstance = null;

    function _ctEnsureFfmpeg() {
        if (_ffmpegInstance) return Promise.resolve(_ffmpegInstance);
        return loadScriptPromise('https://unpkg.com/\u0040ffmpeg/ffmpeg\u00400.11.6/dist/ffmpeg.min.js').then(function() {
            var ns = window.FFmpeg || {};
            var createFFmpeg = ns.createFFmpeg;
            var fetchFile = ns.fetchFile;
            if (!createFFmpeg) throw new Error('FFmpeg library failed to load');
            var ffmpeg = createFFmpeg({
                log: false,
                corePath: 'https://unpkg.com/\u0040ffmpeg/core\u00400.11.0/dist/ffmpeg-core.js'
            });
            _ffmpegInstance = { ffmpeg: ffmpeg, fetchFile: fetchFile };
            return ffmpeg.load().then(function(){ _ffmpegLoaded = true; return _ffmpegInstance; });
        });
    }

    function processFile(blob, fileName) {
        var isWebm = false;
        var outExt = isWebm ? 'webm' : 'mp4';
        var outMime = isWebm ? 'video/webm' : 'video/mp4';
        var notice = document.getElementById('waiting');
        _ctEnsureFfmpeg().then(function(ctx) {
            var ffmpeg = ctx.ffmpeg, fetchFile = ctx.fetchFile;
            ffmpeg.FS('writeFile', 'in.gif', new Uint8Array(0));
            return fetchFile(blob).then(function(buf) {
                ffmpeg.FS('writeFile', 'in.gif', buf);
                var args = isWebm
                    ? ['-i', 'in.gif', '-c:v', 'libvpx', '-b:v', '1M', '-auto-alt-ref', '0', 'out.webm']
                    : ['-i', 'in.gif', '-movflags', 'faststart', '-pix_fmt', 'yuv420p', '-vf', 'scale=trunc(iw/2)*2:trunc(ih/2)*2', 'out.mp4'];
                return ffmpeg.run.apply(ffmpeg, args).then(function() {
                    var data = ffmpeg.FS('readFile', 'out.' + outExt);
                    var outBlob = new Blob([data.buffer], { type: outMime });
                    add_file_output(URL.createObjectURL(outBlob), (fileName || 'animation').replace(/\.[^.]+$/, '.' + outExt));
                });
            });
        }).catch(function(err) {
            alert('Could not convert this GIF: ' + (err && err.message || err) + '. The first run downloads ~30 MB of conversion code — please check your connection and try again.');
        });
    }







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}