Pydub - How to change frame rate without changing playback speed

Question

I have a couple audio files that I open in Pydub with AudioSegment.

I want to decrease the audio quality from frame rate 22050 to 16000 Hz. (One channel files)

If I simply change the frame rate of AudioSegment, what I get is the exact same wave played in slower speed. Well, fair enough.

But how do I actually change the waves to fit a lower quality, same speed playback?

(Manual interpolation is the only thing I can think of, but I don't want to get into that trouble)

Beekman

Have you tried AudioSegment().set_frame_rate() ? – Drinker

Would you post that as an answer? – Nib

Answer 1

You can use:

sound = AudioSegment.from_file(…)
sound = sound.set_frame_rate(16000)

Drinker

That's much easier than what I was doing: subprocess.check_output(['sox',filename,'-r','16000',new_filename]) – Showing

I made a mistake in trying to implement this, maybe it can save some time for others reading the answer: I tried sound.set_frame_rate(16000) thinking it would apply the operation on the sound object which could afterwards be exported. However, as correctly stated in this answer, you need to assign the result to a (new or existing) variable, so sound = sound.set_frame_rate(16000). – Mercurochrome

Answer 2

Or you can do this instead also:

import librosa

y, sr = librosa.load(path, sr=16000)

and use it further as per your requirement.

Wheelchair