playing audio generate noise...

[MenGuangwen0411]

I use pyav on win10 as:

from future import print_function
from PyQt5.QtMultimedia import *
import time
import av

container = av.open(r'd:\king.mp4')
stream = next(s for s in container.streams if s.type == 'audio')

fifo = av.AudioFifo()
resampler = av.AudioResampler(
format=av.AudioFormat('s16').packed,
layout='stereo',
rate=48000,
)

qformat = QAudioFormat()
qformat.setByteOrder(QAudioFormat.LittleEndian)
qformat.setChannelCount(2)
qformat.setCodec('audio/pcm')
qformat.setSampleRate(48000)
qformat.setSampleSize(16)
qformat.setSampleType(QAudioFormat.SignedInt)

output = QAudioOutput(qformat)
output.setBufferSize(16 * 48000)

device = output.start()

print(qformat, output, device)

def decode_iter():
try:
for pi, packet in enumerate(container.demux(stream)):
for fi, frame in enumerate(packet.decode()):
yield pi, fi, frame
except:
return

for pi, fi, frame in decode_iter():

frame = resampler.resample(frame)
print(pi, fi, frame, output.state())

bytes_buffered = output.bufferSize() - output.bytesFree()
us_processed = output.processedUSecs()
us_buffered = 1000000 * bytes_buffered / (2 * 16 / 8) / 48000
print('pts: %.3f, played: %.3f, buffered: %.3f' % (frame.time or 0, us_processed / 1000000.0, us_buffered / 1000000.0))


data = frame.planes[0].to_bytes()
while data:
    written = device.write(data)
    if written:
        # print 'wrote', written
        data = data[written:]
    else:
        # print 'did not accept data; sleeping'
        time.sleep(0.033)

if False and pi % 100 == 0:
    output.reset()
    print(output.state(), output.error())
    device = output.start()

# time.sleep(0.05)

while output.state() == QAudio.ActiveState:
time.sleep(0.1)

It works but the sound is very noisy, although hearable, how to deal with the noise?

[nshmyrev]

Most likely a bug in #1022