1.首先获得音频相应的翻译，格式如下：

2.分割语句，获得字符：

 def count_manifest(counter, manifest_path):
    with open(manifest_path, 'r', encoding='utf-8') as f:
        for line in f.readlines():
            for char in line.replace('\n', ''):
                counter.update(char)

3.将字符排序后写入列表，最后将列表写入json文件：

count_manifest(counter, args.manifest_path)

    count_sorted = sorted(counter.items(), key=lambda x: x[1], reverse=True)
    with codecs.open(args.vocab_path, 'w', 'utf-8') as fout:
        labels = [‘?’]
       
        
        for char, count in count_sorted:
            if count < args.count_threshold: break
            labels.append(char)
        json.dump(labels, fout)

4.注意：label 列表的第一个字符应该设为空字符，以便于ctcdecode识别。