使用Google Speech API调用返回空结果（200状态码）求助

Got it, let's figure out why you're getting an empty response from the Google Speech-to-Text API even though it returns a 200 OK status. Here are the most likely fixes to try, ordered by how common they are:

1. Double-Check Your Base64 Encoding #

• Make sure you're encoding the entire binary content of your OGG file—no truncation! If the content was too long to share, verify your encoder didn't cut it off mid-process.
• Don't add any extra fluff to the content field in your JSON: skip prefixes like data:audio/ogg;base64, and avoid random line breaks or whitespace. Google expects just the raw Base64 string.
• Test your Base64 string by decoding it back to a file and playing it. If the decoded file won't play or sounds corrupted, that's your problem right there.

2. Validate Your Audio File & Transcoding #

Even if you set the sample rate to 16000Hz, let's confirm the OGG_OPUS file is properly formatted:

• Use a tool like FFmpeg to inspect the file details:

  ffmpeg -i SpeechToText.ogg
  

  Look for output lines that say Sample rate: 16000 Hz and Codec: opus. If either is missing, re-transcode the file with a reliable command:

  ffmpeg -i your-original-file.ogg -c:a libopus -ar 16000 -b:a 64k fixed-16k.ogg
  

• Play the transcoded file to confirm it has clear, recognizable German speech (since you set languageCode: "de-DE"). If the audio is silent, distorted, or in a different language, the API can't pick up anything.

3. Tweak Your API Request Configuration #

• Double-check the encoding parameter is exactly "OGG_OPUS" (it's case-sensitive—don't use "opus" or "ogg-opus").
• If your speech is a specific German dialect (like Austrian or Swiss), try switching languageCode to "de-AT" or "de-CH" instead of "de-DE".
• Add a few optional flags to help the API recognize speech better:

  {
    "audio": { "content": "YOUR_FULL_BASE64_STRING" },
    "config": {
      "encoding": "OGG_OPUS",
      "languageCode": "de-DE",
      "sampleRateHertz": 16000,
      "enableAutomaticPunctuation": true,
      "enableWordTimeOffsets": true
    }
  }
  

4. Test with the Official Demo UI #

Use Google's built-in Speech-to-Text demo to upload your audio file directly. If it returns results there, the issue is with your request setup (not the file or API access). If it still returns nothing, the problem is definitely with the audio file itself.

5. Check Quotas & Permissions #

Even with a 200 response, confirm your API key/service account has:

• The Cloud Speech-to-Text API enabled in the Google Cloud Console.
• No quota limits reached (you can check this under the "Quotas" section of the console).

内容的提问来源于stack exchange，提问作者BluPxl