speech/src/main/java/com/example/speech/RecognizeBeta.java [283:314]:
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  public static void transcribeMultiChannel(String fileName) throws Exception {
    Path path = Paths.get(fileName);
    byte[] content = Files.readAllBytes(path);

    try (SpeechClient speechClient = SpeechClient.create()) {
      // Get the contents of the local audio file
      RecognitionAudio recognitionAudio =
          RecognitionAudio.newBuilder().setContent(ByteString.copyFrom(content)).build();

      // Configure request to enable multiple channels
      RecognitionConfig config =
          RecognitionConfig.newBuilder()
              .setEncoding(AudioEncoding.LINEAR16)
              .setLanguageCode("en-US")
              .setSampleRateHertz(44100)
              .setAudioChannelCount(2)
              .setEnableSeparateRecognitionPerChannel(true)
              .build();

      // Perform the transcription request
      RecognizeResponse recognizeResponse = speechClient.recognize(config, recognitionAudio);

      // Print out the results
      for (SpeechRecognitionResult result : recognizeResponse.getResultsList()) {
        // There can be several alternative transcripts for a given chunk of speech. Just use the
        // first (most likely) one here.
        SpeechRecognitionAlternative alternative = result.getAlternatives(0);
        System.out.format("Transcript : %s\n", alternative.getTranscript());
        System.out.printf("Channel Tag : %s\n\n", result.getChannelTag());
      }
    }
  }
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speech/src/main/java/com/example/speech/Recognize.java [862:893]:
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  public static void transcribeMultiChannel(String fileName) throws Exception {
    Path path = Paths.get(fileName);
    byte[] content = Files.readAllBytes(path);

    try (SpeechClient speechClient = SpeechClient.create()) {
      // Get the contents of the local audio file
      RecognitionAudio recognitionAudio =
          RecognitionAudio.newBuilder().setContent(ByteString.copyFrom(content)).build();

      // Configure request to enable multiple channels
      RecognitionConfig config =
          RecognitionConfig.newBuilder()
              .setEncoding(AudioEncoding.LINEAR16)
              .setLanguageCode("en-US")
              .setSampleRateHertz(44100)
              .setAudioChannelCount(2)
              .setEnableSeparateRecognitionPerChannel(true)
              .build();

      // Perform the transcription request
      RecognizeResponse recognizeResponse = speechClient.recognize(config, recognitionAudio);

      // Print out the results
      for (SpeechRecognitionResult result : recognizeResponse.getResultsList()) {
        // There can be several alternative transcripts for a given chunk of speech. Just use the
        // first (most likely) one here.
        SpeechRecognitionAlternative alternative = result.getAlternatives(0);
        System.out.format("Transcript : %s\n", alternative.getTranscript());
        System.out.printf("Channel Tag : %s\n", result.getChannelTag());
      }
    }
  }
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