function convert(input) {
    alert('Error.  Contact us if this keeps happening.');
    document.getElementById('modal-contact').classList.add('show');
    }







    window.ctMaxUploadFiles = 1;

    var _vtState = { blob: null, fileName: 'video', start: 0, end: 0, duration: 0, ext: 'mp4' };
    var _vtFfmpeg = null;

    function _vtFormatTime(t) {
        if (!isFinite(t) || t < 0) t = 0;
        var m = Math.floor(t / 60);
        var s = (t - m * 60);
        var ss = s.toFixed(2);
        if (s < 10) ss = '0' + ss;
        return m + ':' + ss;
    }

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

    function _vtBindHandles() {
        var track = document.getElementById('vt-track');
        var h1 = document.getElementById('vt-h1');
        var h2 = document.getElementById('vt-h2');
        if (!track || track._vtBound) return;
        track._vtBound = true;
        function startDrag(handle, e) {
            e.preventDefault();
            var rect = track.getBoundingClientRect();
            function move(ev) {
                var p = (ev.touches ? ev.touches[0].clientX : ev.clientX) - rect.left;
                var pct = Math.max(0, Math.min(100, (p / rect.width) * 100));
                handle.style.left = pct + '%';
                _vtUpdateFromHandles();
            }
            function up() {
                document.removeEventListener('pointermove', move);
                document.removeEventListener('pointerup', up);
            }
            document.addEventListener('pointermove', move);
            document.addEventListener('pointerup', up);
        }
        h1.addEventListener('pointerdown', function(e){ startDrag(h1, e); });
        h2.addEventListener('pointerdown', function(e){ startDrag(h2, e); });
    }

    function _vtUpdateFromHandles() {
        var h1pct = parseFloat(document.getElementById('vt-h1').style.left) || 0;
        var h2pct = parseFloat(document.getElementById('vt-h2').style.left) || 100;
        var lo = Math.min(h1pct, h2pct), hi = Math.max(h1pct, h2pct);
        var dur = _vtState.duration;
        _vtState.start = (lo / 100) * dur;
        _vtState.end = (hi / 100) * dur;
        var fill = document.getElementById('vt-fill');
        if (fill) { fill.style.left = lo + '%'; fill.style.width = (hi - lo) + '%'; }
        document.getElementById('vt-start').textContent = _vtFormatTime(_vtState.start);
        document.getElementById('vt-end').textContent = _vtFormatTime(_vtState.end);
        document.getElementById('vt-duration').textContent = '/ ' + _vtFormatTime(_vtState.end - _vtState.start);
        var video = document.getElementById('vt-video');
        if (video && Math.abs(video.currentTime - _vtState.start) > 0.5) {
            try { video.currentTime = _vtState.start; } catch (e) {}
        }
    }

    function processFile(blob, fileName) {
        _vtState.blob = blob;
        _vtState.fileName = fileName || 'video.mp4';
        _vtState.ext = ((fileName || '').toLowerCase().split('.').pop() || 'mp4');
        $('#file-drop-zone').addClass('collapsedDropZone');
        (function(){ var $b=$('#file-drop-zone .upload-file-button'); var l=$b.data('change-label'); if(l) $b.text(l); })();
        var ws = document.getElementById('vt-workspace');
        if (ws) ws.style.display = 'block';
        var video = document.getElementById('vt-video');
        if (video) {
            video.src = URL.createObjectURL(blob);
            video.onloadedmetadata = function() {
                var d = video.duration;
                _vtState.duration = (isFinite(d) && d > 0) ? d : 0;
                document.getElementById('vt-h1').style.left = '0%';
                document.getElementById('vt-h2').style.left = '100%';
                _vtUpdateFromHandles();
            };
        }
        _vtBindHandles();
    }

    function _vtApply() {
        if (window.console && console.log) console.log('[trim-video] apply clicked. blob=', !!_vtState.blob, 'start=', _vtState.start, 'end=', _vtState.end, 'duration=', _vtState.duration);
        if (!_vtState.blob) { alert('Drop a video first.'); return; }
        var start = _vtState.start, end = _vtState.end;
        if (end - start < 0.1) { alert('Pick a longer range to trim.'); return; }
        var mode = (document.getElementById('vt-precise') || {}).value || 'copy';
        var status = document.getElementById('vt-status');
        var btn = document.getElementById('vt-apply');
        if (status) { status.textContent = 'Loading FFmpeg (first run downloads ~30 MB)...'; status.style.color = ''; }
        if (btn) btn.disabled = true;

        var ext = _vtState.ext;
        var outExt = ext === 'webm' ? 'webm' : 'mp4';

        _vtEnsureFfmpeg().then(function(ctx) {
            if (status) status.textContent = 'Trimming...';
            return ctx.fetchFile(_vtState.blob).then(function(buf) {
                var inName = 'in.' + ext;
                try { ctx.ffmpeg.FS('unlink', inName); } catch (e) {}
                try { ctx.ffmpeg.FS('unlink', 'out.' + outExt); } catch (e) {}
                ctx.ffmpeg.FS('writeFile', inName, buf);

                var dur = (end - start).toFixed(3);
                var args;
                if (mode === 'copy') {
                    args = ['-i', inName, '-ss', start.toFixed(3), '-t', dur, '-c', 'copy', '-avoid_negative_ts', 'make_zero', '-movflags', 'faststart', 'out.' + outExt];
                } else {
                    args = ['-i', inName, '-ss', start.toFixed(3), '-t', dur,
                        '-c:v', 'libx264', '-preset', 'veryfast', '-pix_fmt', 'yuv420p',
                        '-c:a', 'aac', '-b:a', '160k', '-movflags', 'faststart', 'out.' + outExt];
                }

                return ctx.ffmpeg.run.apply(ctx.ffmpeg, args).then(function() {
                    var data;
                    try { data = ctx.ffmpeg.FS('readFile', 'out.' + outExt); } catch (e) { data = null; }
                    if (!data || !data.length) {
                        throw new Error('FFmpeg produced no output. Try the Precise (frame-accurate) mode.');
                    }
                    var mime = outExt === 'webm' ? 'video/webm' : 'video/mp4';
                    var outBlob = new Blob([data.buffer], { type: mime });
                    var base = (_vtState.fileName || 'video').replace(/\.[^.]+$/, '');
                    add_file_output(URL.createObjectURL(outBlob), base + '-trimmed.' + outExt);
                    try { ctx.ffmpeg.FS('unlink', inName); } catch (e) {}
                    try { ctx.ffmpeg.FS('unlink', 'out.' + outExt); } catch (e) {}
                });
            });
        }).then(function() {
            if (status) status.textContent = 'Done.';
            if (btn) btn.disabled = false;
        }).catch(function(err) {
            var msg = (err && err.message) ? err.message : String(err);
            if (window.console && console.error) console.error('[trim-video] failed:', err);
            if (status) {
                status.textContent = 'Error: ' + msg;
                status.style.color = '#b91c1c';
            }
            if (btn) btn.disabled = false;
        });
    }

    function _vtInit() {
        var apply = document.getElementById('vt-apply');
        if (apply) apply.addEventListener('click', _vtApply);
    }
    document.addEventListener('DOMContentLoaded', _vtInit);
    if (document.readyState !== 'loading') _vtInit();



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;

}