function Script(CQ, Preset, SizePercent, BufsizeMultiplier, AQStrength, RcLookahead)
{
    CQ                = CQ                || 24;
    Preset            = Preset            || 'p7';
    SizePercent       = SizePercent       || 60;
    BufsizeMultiplier = BufsizeMultiplier || 2;
    AQStrength        = AQStrength        || 15;
    RcLookahead       = RcLookahead       || 64;

    let SizeFactor = SizePercent / 100;

    // ─────────────────────────────────────────────────────────────────────────
    // Variables.vi.VideoInfo ist in dieser FileFlows-Version im ScriptNode LEER
    // (verifiziert 2026-07-06). Daher Video-/Audio-Info direkt per ffprobe holen.
    // ffprobe liefert echte Kanalzahlen (6/8) -> kein "5.1"-Layout-Umrechnen noetig.
    // ─────────────────────────────────────────────────────────────────────────
    function probeInfo() {
        var probe = null;
        try { probe = Flow.GetToolPath('ffprobe'); } catch (e) {}
        if (!probe) probe = Variables['ffprobe'] || 'ffprobe';
        var res = Flow.Execute({
            command: probe,
            argumentList: ['-v', 'quiet', '-print_format', 'json',
                           '-show_format', '-show_streams', Flow.WorkingFile]
        });
        if (!res || res.exitCode !== 0) { Logger.WLog('ffprobe fehlgeschlagen'); return null; }
        var j;
        try { j = JSON.parse(res.standardOutput || res.output || ''); } catch (e) { Logger.WLog('ffprobe JSON-Fehler: ' + e); return null; }
        var streams = j.streams || [];
        var fmtBr = parseInt((j.format && j.format.bit_rate) || 0, 10) || 0;
        function tagBps(s) { var t = s.tags || {}; return parseInt(t.BPS || t['BPS-eng'] || t.bps || 0, 10) || 0; }
        var vids = [], auds = [];
        for (var i = 0; i < streams.length; i++) {
            var s = streams[i], disp = s.disposition || {};
            if (s.codec_type === 'video') {
                if (disp.attached_pic === 1 || s.codec_name === 'mjpeg' || s.codec_name === 'png') continue;
                var dovi = (s.side_data_list || []).some(function (x) {
                    var t = ('' + (x.side_data_type || '')).toLowerCase();
                    return t.indexOf('dovi') !== -1 || t.indexOf('dolby vision') !== -1;
                });
                var trc = ('' + (s.color_transfer || ''));
                vids.push({
                    Width: s.width || 0, Height: s.height || 0, Codec: (s.codec_name || ''),
                    Bitrate: tagBps(s) || 0, ColorTransfer: trc,
                    ColorPrimaries: s.color_primaries || '', ColorSpace: s.color_space || '',
                    PixelFormat: s.pix_fmt || '', DolbyVision: dovi,
                    DolbyVisionProfile: dovi ? (trc.indexOf('smpte2084') !== -1 ? 7 : 5) : null
                });
            } else if (s.codec_type === 'audio') {
                var t = s.tags || {};
                auds.push({
                    Language: t.language || '', Codec: (s.codec_name || ''),
                    Channels: s.channels || 0, ChannelLayout: s.channel_layout || '',
                    Title: t.title || '', Profile: s.profile || '', Default: (disp.default === 1)
                });
            }
        }
        return { Bitrate: fmtBr, VideoStreams: vids, AudioStreams: auds };
    }

    let vi = probeInfo();
    if (!vi || !vi.VideoStreams || vi.VideoStreams.length === 0) {
        Logger.ELog('Kein Video-Stream (ffprobe)'); return 2;
    }

    let v = vi.VideoStreams[0];
    let bitrateBps = v.Bitrate || 0;
    if (bitrateBps <= 0 && vi.Bitrate) bitrateBps = Math.round(vi.Bitrate * 0.92);
    if (bitrateBps <= 0) { Logger.ELog('Bitrate nicht ermittelbar - Skip'); return 2; }

    let srcMbps = bitrateBps / 1000000;
    let maxrateMbps = Math.round(srcMbps * SizeFactor * 10) / 10;
    let bufsizeMbps = Math.round(maxrateMbps * BufsizeMultiplier * 10) / 10;

    // HDR / Dolby Vision Detection
    let colorTrc       = (v.ColorTransfer  || '').toLowerCase();
    let colorPrim      = (v.ColorPrimaries || '').toLowerCase();
    let colorSpace     = (v.ColorSpace     || '').toLowerCase();
    let isHDR10        = colorTrc.indexOf('smpte2084') !== -1;
    let fileName       = ('' + (Variables['file.Orig.FullName'] || Variables['file.FullName'] || '')).toLowerCase();
    let dvByName       = (fileName.indexOf('.dv.') !== -1 || fileName.indexOf('dolby.vision') !== -1
                          || fileName.indexOf('dolbyvision') !== -1 || fileName.indexOf('.dovi.') !== -1);
    let isDV           = !!(v.DolbyVision || dvByName);
    let dvProfile      = v.DolbyVisionProfile || (isDV ? 7 : null);
    let forceSDR       = (isDV && dvProfile === 5);

    Logger.ILog('Quelle: ' + srcMbps.toFixed(1) + ' Mbit/s');
    Logger.ILog('Cap   : maxrate=' + maxrateMbps + ' Mbit/s  bufsize=' + bufsizeMbps + ' Mbit/s (<= ' +
        SizePercent + '% der Quelle)');
    Logger.ILog('Color : HDR10=' + isHDR10 + ' DV=' + isDV + ' Profile=' + dvProfile + ' forceSDR=' + forceSDR);

    // ── ffmpeg-Argumente
    let ffmpeg = Flow.GetToolPath('ffmpeg');
    if (!ffmpeg) { Logger.ELog('ffmpeg-Tool nicht gefunden (Flow.GetToolPath)'); return 2; }
    let inputFile = Flow.WorkingFile;
    let args = ['-hide_banner', '-y', '-hwaccel', 'cuda', '-i', inputFile];

    // Video (nur der erste Video-Stream -> AV1; cover/poster werden mit -map 0:v:0 ignoriert)
    args.push('-map', '0:v:0',
              '-c:v', 'av1_nvenc',
              '-pix_fmt', 'p010le',
              '-rc', 'vbr',
              '-cq', '' + CQ,
              '-b:v', '0',
              '-preset', Preset,
              '-tune', 'hq',
              '-multipass', 'fullres',
              '-spatial-aq', '1',
              '-temporal-aq', '1',
              '-aq-strength', '' + AQStrength,
              '-rc-lookahead', '' + RcLookahead,
              '-maxrate', maxrateMbps + 'M',
              '-bufsize', bufsizeMbps + 'M');

    if (isDV && dvProfile === 7) {
        args.push('-bsf:v', 'filter_units=remove_types=62');
    }

    if (forceSDR) {
        // DV Profil 5: keine HDR10-Fallback-Metadaten -> ohne Tonemapping Gruen-/Lilastich.
        args.push('-vf', 'tonemapx=tonemap=bt2390:transfer=bt709:matrix=bt709:primaries=bt709:format=yuv420p',
                  '-color_trc', 'bt709', '-color_primaries', 'bt709', '-colorspace', 'bt709');
        Logger.ILog('DV P5 -> Software-Tonemap nach SDR (bt709)');
    } else {
        if (v.ColorTransfer)  args.push('-color_trc',       v.ColorTransfer);
        if (v.ColorPrimaries) args.push('-color_primaries', v.ColorPrimaries);
        if (v.ColorSpace)     args.push('-colorspace',      v.ColorSpace);
    }

    // ── Audio: EAC3-Kompatspur anhaengen, WENN beste deutsche Spur DTS ist (Denon-HDMI-Sync).
    //    Sonst (TrueHD/AC3/EAC3 oder keine DE-Spur) alle Audiospuren 1:1 kopieren.
    //    Channels kommt jetzt als echte Kanalzahl von ffprobe (6/8), kein Umrechnen noetig.
    function langOf(a) { return ('' + (a.Language || '')).toLowerCase().trim(); }
    function isGerman(a) { let l = langOf(a); return (l === 'ger' || l === 'deu' || l === 'de'); }
    function acodec(a) { return ('' + (a.Codec || '')).toLowerCase(); }
    function isDts(a) { return acodec(a).indexOf('dts') === 0; }
    function channels(a) { return parseInt(a.Channels, 10) || 0; }
    function atitle(a) { return '' + (a.Title || a.Name || ''); }
    // von UNS frueher erzeugte EAC3-Kompatspur (Titel-Tag) -> beim Neu-Mux verwerfen (idempotent).
    function isOldCompat(a) { return acodec(a).indexOf('eac3') !== -1 && atitle(a).indexOf('AVR-kompatibel') !== -1; }

    let audioStreams = (vi.AudioStreams || []);
    let excludeIdx = -1;                          // relativer a-Index unserer alten Kompatspur
    let bestGer = null, bestGerAIdx = -1;
    for (let i = 0; i < audioStreams.length; i++) {
        if (isOldCompat(audioStreams[i])) { excludeIdx = i; continue; }   // NICHT als beste DE-Spur werten
        if (isGerman(audioStreams[i]) && (!bestGer || channels(audioStreams[i]) > channels(bestGer))) {
            bestGer = audioStreams[i]; bestGerAIdx = i;
        }
    }

    if (audioStreams.length === 0) {
        Logger.WLog('Keine Audio-Info verfuegbar -> Audio 1:1 kopieren (kein EAC3)');
        args.push('-map', '0:a', '-c:a', 'copy');
    } else if (bestGer !== null && isDts(bestGer)) {
        let ch = channels(bestGer) || 6;
        let outCh = (ch >= 6) ? 6 : (ch >= 2 ? ch : 2);   // EAC3 max 5.1
        Logger.ILog('Audio: beste DE-Spur ist DTS (' + acodec(bestGer) + ' ' + ch + 'ch, Idx ' +
                    bestGerAIdx + ') -> EAC3 ' + outCh + 'ch als Default davor (Rest 1:1).' +
                    (excludeIdx >= 0 ? ' Alte EAC3-Kompatspur (a:' + excludeIdx + ') verworfen.' : ''));
        args.push('-map', '0:a:' + bestGerAIdx, '-map', '0:a');
        if (excludeIdx >= 0) args.push('-map', '-0:a:' + excludeIdx);   // alte Kompatspur raus
        args.push('-c:a', 'copy', '-c:a:0', 'eac3', '-ac:a:0', '' + outCh,
                  '-b:a:0', (outCh >= 6 ? '640k' : '256k'),
                  '-metadata:s:a:0', 'title=Deutsch (EAC3 AVR-kompatibel)',
                  '-metadata:s:a:0', 'language=ger',
                  '-disposition:a', '0', '-disposition:a:0', 'default');
    } else {
        if (bestGer === null) Logger.ILog('Audio: keine DE-Spur -> 1:1 kopieren.');
        else Logger.ILog('Audio: beste DE-Spur ist ' + acodec(bestGer) + ' (kein DTS) -> 1:1 kopieren.' +
                         (excludeIdx >= 0 ? ' Alte EAC3-Kompatspur (a:' + excludeIdx + ') verworfen.' : ''));
        args.push('-map', '0:a');
        if (excludeIdx >= 0) args.push('-map', '-0:a:' + excludeIdx);
        args.push('-c:a', 'copy');
    }

    // Subtitles + Kapitel 1:1
    args.push('-map', '0:s?', '-c:s', 'copy');

    args.push('-dn',
              '-max_muxing_queue_size', '9999',
              '-avoid_negative_ts', 'make_zero');

    // Output-Datei
    let outFile = Flow.TempPath + '/' + Flow.NewGuid() + '.mkv';
    args.push(outFile);

    Logger.ILog('FFmpeg: ' + args.join(' '));

    let result = Flow.Execute({
        command: ffmpeg,
        argumentList: args
    });

    if (!result || result.exitCode !== 0) {
        Logger.ELog('AV1 Encode fehlgeschlagen (exitCode=' + (result ? result.exitCode : '?') + ')');
        if (result && result.standardError) Logger.ELog(result.standardError);
        return 2;
    }

    Flow.SetWorkingFile(outFile);
    Logger.ILog('AV1 Encode erfolgreich -> ' + outFile);
    return 1;
}