youtube频道视频的灯箱视频弹出窗口

Question

当我点击图像视频弹出窗口但没有播放时，即仅显示加载符号。

我的js代码是

foreach (mp3file file in fileList){
        string outputfilename = fbd.SelectedPath + "\\" + file.name + ".wav";
        using (Mp3FileReader reader = new Mp3FileReader(file.path)){
            using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader)){
            WaveFileWriter.CreateWaveFile(outputfilename, convertedStream);
        }
        progressBar.PerformStep(); // This isn't working.
        progressBar.Refresh();     // This might fix it
    }