[英]Raspberry Pi convert Pyaudio Wav to Flac 48000hz + Google Speech
我面臨以下問題:
我用Pyaudio錄制了聲音,並將其保存為Wav。 Wav文件為48000hz(沒有其他速率起作用(采樣率錯誤,但那是另一個故事))。Wav文件聽起來不錯,現在我想將wav轉換為flac並將其發送到Google語音api。
問題是avconf將我的48khz輸入wav轉換為8khz flac(帶有-ar 48000)。 flac文件只是白噪聲,我已經嘗試了很多,但即使Google也沒有答案;)
注意:與其他頻率為16Khz的麥克風配合使用,對我來說還算不錯。 Pyaudios采樣率錯誤或avconv問題均不存在。
這是代碼:
記錄:
chunk = 2048
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 48000
THRESHOLD = 525 #The threshold intensity that defines silence signal (lower than).
SILENCE_LIMIT = 3 #Silence limit in seconds. The max ammount of seconds where only silence is recorded. When this time passes the recording finishes and the file is delivered.
#open stream
p = pyaudio.PyAudio()
stream = p.open(format = FORMAT,
channels = CHANNELS,
rate = RATE,
input = True,
frames_per_buffer = chunk)
print "* listening. CTRL+C to finish manually."
all_m = []
data = ''
rel = RATE/chunk
slid_win = deque(maxlen=SILENCE_LIMIT*rel)
started = False
while (True):
data = stream.read(chunk)
slid_win.append (abs(audioop.avg(data, 2)))
if(True in [ x>THRESHOLD for x in slid_win]):
if(not started):
print "starting record"
started = True
all_m.append(data)
elif (started==True):
print "finished"
#the limit was reached, finish capture and deliver
filename = save_speech(all_m,p)
result=stt_google_wav(filename)
#reset all
started = False
#slid_win = deque(maxlen=SILENCE_LIMIT*rel)
#all_m= []
print "Google STT Done"
stream.close()
p.terminate()
return result
和:
def save_speech(data, p):
filename = 'output_'+str(int(time.time()))
# write data to WAVE file
data = ''.join(data)
wf = wave.open(filename+'.wav', 'wb')
wf.setnchannels(1)
wf.setsampwidth(p.get_sample_size(pyaudio.paInt16))
wf.setframerate(48000)
wf.writeframes(data)
wf.close()
print "finished saving wav: %s" % filename
return filename
轉換為Flac:
os.system("avconv -i "+ filename+".wav -y -ar 48000 "+ filename+ ".flac")
編輯1:
Flac實際上是48khz,我不知道為什么mplayer向我顯示flac是8khz,我在我的PC上播放了它,並且flac非常完美,無論如何google api似乎都存在問題,因為它什么也不返回。 我假設Rasberry上的mplayer的白噪聲問題與Google Api的問題有關,但我不知道這可能是什么。
Wav文件:
output_1385413929.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 48000 Hz
Flac文件:
output_1385413929.flac: FLAC audio bitstream data, 16 bit, mono, 48 kHz, 204800 samples
解決了:我不知道為什么,我打開pi,想測試一下,突然間它沒有任何改變就可以工作了。
泰語為您提供幫助。 來自德國,Flo的問候
我同意-為我努力:
me@raspberrypi /mnt/share/Audio/xxxxxx $ file sample_audio.wav
sample_audio.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 8000 Hz
me@raspberrypi /mnt/share/Audio/xxxxxx $ file sample_audio.flac
sample_audio.flac: FLAC audio bitstream data, 16 bit, stereo, 48 kHz, 9131406 samples
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