扬声器偏音始终以C＃

Question

我目前正在使用Google Cloud对Text SDK for c＃的演讲。我正在使用的nuget包是Google.Cloud.Speech.V1P1Beta1。我试图从较长的视频的语音隔离中受益，但是无论音频中有多少个扬声器，它都会在所有单词的扬声器标签中始终返回0。以下是我的代码

var longOperation = speech.LongRunningRecognize(new RecognitionConfig()
               {
                   Encoding = RecognitionConfig.Types.AudioEncoding.Linear16,
                   DiarizationSpeakerCount = 2,
                   EnableSpeakerDiarization = true,
                   SampleRateHertz = 16000,
                   LanguageCode = "en",
               }, RecognitionAudio.FromFile("testRecording.wav"));

               longOperation = longOperation.PollUntilCompleted();
               var response = longOperation.Result;
               Console.WriteLine("Response received successfully.");

               foreach (var result in response.Results)
               {
                   foreach (var alternative in result.Alternatives)
                   {
                       foreach (var word in alternative.Words)
                       {
                           Console.WriteLine($"{word.Word}: {word.SpeakerTag}");
                       }
                   }
               }