I'm trying to use pyav
to convert arbitrary audio file to a low quality, mono, wave file.
I almost managed to do it, but it's stereo, and I couldn't find how to make it mono. Furthermore, I think I made some mistake here, as I had to repeat the rate
in the output_container.add_stream
and in the AudioResampler
- it seems redundant, and I can't understand what would happen if those numbers won't match.
My code is:
import av
input_file = 'some.mp3'
output_file = 'new.wav'
rate = 22000
output_container = av.open(output_file, 'w')
# can I tell `output_stream` to just use `resampler`'s info?
# or, if not, how can I tell it to have only 1 channel?
output_stream = output_container.add_stream('pcm_u8', rate)
resampler = av.audio.resampler.AudioResampler('u8p', 'mono', rate)
input_container = av.open(input_file)
for frame in input_container.decode(audio=0):
out_frames = resampler.resample(frame)
for out_frame in out_frames:
for packet in output_stream.encode(out_frame):
output_container.mux(packet)
output_container.close()
And not related to my main question, but any comments regarding my code, or pointing out mistakes, are welcomed. I hardly could find usage examples to use a reference, and PyAV API documentation isn't very detailed...
Searching around in StackOverflow, I found https://stackoverflow.com/a/72386137/1543290 which has:
out_stream = out_container.add_stream(
'pcm_s16le',
rate=sample_rate,
layout='mono'
)
So, the answer is adding layout='mono'
. Sadly, this parameter is not documented.
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