python – dejavu.py识别的歌曲的附加信息

我目前正在调查 dejavu.py( some more info),我必须说到目前为止我对此印象深刻.虽然我发现文档在用户界面方面有点不完整.
当您使用oDjv.recognize(FileRecognizer,sFile)识别来自文件的歌曲时,您将返回一个如下所示的字典：

{'song_id': 2,'song_name': 'Sean-Fournier--Falling-For-You','file_sha1': 'A9D18B9B9DAA467350D1B6B249C36759282B962E','confidence': 127475,'offset_seconds': 0.0,'match_time': 32.23410487174988,'offset': 0}

从录制(oDjv.recognize(MicrophoneRecognizer,seconds = iSecs))：

{'song_id': 2,'confidence': 124,'offset_seconds': 24.89179,'offset': 536}

所以,对于问题：
1)信心究竟是什么,信心水平是否有上限？

2)offset_seconds和offset之间有什么区别？

3)为什么算法需要在30到60秒之间(在我运行的所有测试的情况下)从磁盘识别歌曲,但是在录制音频时它可以在10秒左右的时间内完成？

4)当运行从音频录制的功能时,我从该功能获得实际输出之前的以下代码块(即使成功).我们要去哪儿？

ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started

5)是否有可以插入配置的在线音乐数据库？

dConfig = {
    "database": {
        "host": "some magical music database","user": "root","passwd": "","db": "dejavu"
    }
}

oDjv = Dejavu(dConfig)