我正在尝试从youtube下载的mp4媒体文件中提取文本。由于我正在使用谷歌云平台,所以想尝试一下谷歌云演讲。
在所有的安装和配置之后,我复制了以下代码片段以开始:
with io.open(file_name, 'rb') as audio_file:
content = audio_file.read()
audio = types.RecognitionAudio(content=content)
config = types.RecognitionConfig(encoding=enums.RecognitionConfig.AudioEncoding.LINEAR16, sample_rate_hertz=16000, language_code='en-US')
response = client.long_running_recognize(config, audio)
但我得到了以下关于文件大小的错误:
InvalidArgument:400内联音频超过持续时间限制。请使用GCS URI。
然后我读到我应该对大型媒体文件使用流。因此,我尝试了以下代码片段:
with io.open(file_name, 'rb') as audio_file:
content = audio_file.read()
#In practice, stream should be a generator yielding chunks of audio data.
stream = [content]
requests = (types.StreamingRecognizeRequest(audio_content=chunk)for chunk in stream)
config = types.RecognitionConfig(encoding=enums.RecognitionConfig.AudioEncoding.LINEAR16,sample_rate_hertz=16000,language_code='en-US')
streaming_config = types.StreamingRecognitionConfig(config=config)
responses = client.streaming_recognize(streaming_config, requests)
但我仍然得到以下错误:
无效参数:400无效音频内容:太长。
所以,有人能建议一种转录mp4文件和提取文本的方法吗。我对非常大的媒体文件没有任何复杂的要求。媒体文件最长可达10-15分钟。感谢
错误消息表示文件太大,您需要首先将媒体文件复制到Google Cloud Storage,然后指定云存储URI,如gs://bucket/path/mediafile。
使用云存储URI的关键是:
识别音频=RecognitionAudio.newBuilder((.setUri(gcsUri(.build((;
以下代码将向您展示如何为输入指定GCS URI。谷歌在github上有一个完整的例子。
public static void syncRecognizeGcs(String gcsUri) throws Exception {
// Instantiates a client with GOOGLE_APPLICATION_CREDENTIALS
try (SpeechClient speech = SpeechClient.create()) {
// Builds the request for remote FLAC file
RecognitionConfig config =
RecognitionConfig.newBuilder()
.setEncoding(AudioEncoding.FLAC)
.setLanguageCode("en-US")
.setSampleRateHertz(16000)
.build();
RecognitionAudio audio = RecognitionAudio.newBuilder().setUri(gcsUri).build();
// Use blocking call for getting audio transcript
RecognizeResponse response = speech.recognize(config, audio);
List<SpeechRecognitionResult> results = response.getResultsList();
for (SpeechRecognitionResult result : results) {
// There can be several alternative transcripts for a given chunk of speech. Just use the
// first (most likely) one here.
SpeechRecognitionAlternative alternative = result.getAlternativesList().get(0);
System.out.printf("Transcription: %s%n", alternative.getTranscript());
}
}
}