header={
  "recipe_version": "1.15",
  "title": "Trim Video Black Detect",
  "description": "detect if the video has black frames at the beginning and remove them",
  "tags": "video",
  "chef": "BeatRig",
  "spice": "BQ==:G+Hy36kJcnQQYYavb/JV2Il6eCYr6h4hRJHCF9rRbhX5BcazL6cuTgUMdz0xA50VWA5PmmV0Q7aWkiUtNFtbk991l+t0e8IBXMReMIT1GNjnZZDv7n2YRAo0xcSQbY0ixjG6LLH4wGKnspKAoA/v69iLn6N2IH0XzIZwTGdHSo4=",
  "palette": "Clean Slate",
  "flavour": "nvb1kiqzIZRJ2c6uMIB+7p4av9LxKnGzLgvb3dKKrCEjLKN+HYTVQZgiWby+Qoxcg+XG2jVUCTAVkUv8ufjCbNfY2k9A30GADR+t4/Ri9JAU5T6eCojF8sw7876hvPgPqukiPfN9mY7Hi6ugVXWizLJ+P+L30xT78dKqRIYMOjo=",
  "time": 1736352941,
  "core_version": "0.7.2",
  "magnetron_version": "1.0.333",
  "dependencies": "ffprobe,ffmpeg",
  "type": "default",
  "os": "windows,macOS",
  "functions": "main",
  "uuid": "afc871158af44535830b64de1bc88dac",
  "instructions": "Drop file(s) here"
};

// =============================================================================
// GLOBALS
var duration = 0;

// =============================================================================
function main()
{
    // SET PROGRESS BAR
    setProgress(101);

    // GET ALL FILES
    var files = getFiles();

    // CHECK VALID FILES
    for ( const [k, v] of Object.entries(files) ) 
    {
        setMainMessage("preparing file "+k+" of "+files.length);

        // RUN FFPROBE TO GET STREAM TYPE AND DURATION IN ONE CALL
        let ffprobeOutput = cmd("ffprobe", [
            "-loglevel", "error",
            '-select_streams', 'v:0',
            "-show_entries", "stream=codec_type,format=duration",
            "-of", "json",
            v.path,
        ]);

        // PARSE FFPROBE OUTPUT
        const ffprobeData = JSON.parse(ffprobeOutput);
        const isVideo = ffprobeData.streams.some(stream => stream.codec_type === "video");
        
        duration = ffprobeData.format && ffprobeData.format.duration
            ? Math.round(parseFloat(ffprobeData.format.duration) * 1000)
            : null;

        // IF IS NOT A VIDEO FILE
        if(!isVideo) {
            getFileIcon(v.path, v.index, 'Exclamation');
            getFileIconColor(v.path, v.index, 'FFff0000');
            setFileStatus(v.path, v.index, 'Not a valid video file');
            continue;
            }

        // 
        // UPDATE FILE LIST
        getFileIcon(v.path, v.index, 'CaretSquareORight');
        getFileIconColor(v.path, v.index, 'FFdddddd');
        setFileStatus(v.path, v.index, 'processing');

        // OUTFILE
        let path = getPathInfo(v.path);
        let vidout = path.folder+"/"+path.basename+"-[trimmed]."+path.ext;

        // FFMPEG CALL
        setMainMessage("analyzing frames");

        var blackDetect = cmd("ffprobe", [
            '-f','lavfi',
            '-i','movie='+v.path+',blackdetect[out0]',
            '-show_entries','tags=lavfi.black_start,lavfi.black_end',
            '-of','default=nw=1',
            // "-loglevel", "quiet",
            // "-progress", "pipe:1",
            // "-nostats"
            ]);

        const blackStart = parseFloat(blackDetect.match(/TAG:lavfi\.black_start=(.*?)(?=[\n\r])/)?.[1] || null);
        const blackEnd = parseFloat(blackDetect.match(/TAG:lavfi\.black_end=(.*?)(?=[\n\r])/)?.[1] || null);

        if(blackStart == 0. && blackEnd > 0.)
        {
            setMainMessage("trimming file");
            cmd("ffmpeg", [
                '-ss',blackEnd,
                '-i',v.path,
                '-vcodec','copy',
                '-acodec','copy',
                vidout,
                '-y',
                "-loglevel", "quiet",
                "-progress", "pipe:1",
                "-nostats"
                ]);
        }

        // ---------------------------------------------------------------------
        // THIS FILE IS DONE
        setProgress(100);

        // SET STATUS
        if(!fileExists(vidout) || getFileBytes(vidout) == 0)
        {
            if(fileExists(vidout)) deleteFile(vidout);
            getFileIcon(v.path, v.index, 'Exclamation');
            getFileIconColor(v.path, v.index, 'FFff0000');
            setFileStatus(v.path, v.index, 'ERROR');

        }
        else
        {
            getFileIcon(v.path, v.index, 'CheckSquare');
            getFileIconColor(v.path, v.index, 'FF00aa00');
            setFileStatus(v.path, v.index, 'DONE');
        }

        // ---------------------------------------------------------------------
    };

    // ALL IS DONE
    setMainMessage("all done");
}

// =============================================================================
// FFMPEG PROCESS STATUS
function cmd_callback(cmd_name, cmd_output) {
    if (cmd_name === "ffmpeg" && cmd_output.length > 0 && duration > 0) {
        const progress = Math.round((parseInt(cmd_output.match(/out_time_ms=(\d+)/)?.pop() || 0, 10) / 1000) / duration * 100);
        setProgress(progress);
    }
}