Adding silent frame to wav file using python

Question

First time posting here, lets see how this goes. I trying to write a script in python which would add a second of silence in the beginning of the wav file, but so far been unsuccessfully in doing so. What I was trying to do is read in the wav header and then adding a \0 to the beginning using the wave module but that did not work quite well. Here is the code which is based from here http://andrewslotnick.com/posts/audio-delay-with-python.html ``` import wave from audioop import add def input_wave(filename,frames=10000000): #10000000 is an arbitrary large number of frames wave_file = wave.open(filename,'rb') params=wave_file.getparams() audio=wave_file.readframes(frames) wave_file.close() return params, audio #output to file so we can use ipython notebook's Audio widget def output_wave(audio, params, stem, suffix): #dynamically format the filename by passing in data filename=stem.replace('.wav','_{}.wav'.format(suffix)) wave_file = wave.open(filename,'wb') wave_file.setparams(params) w…

Accepted Answer

There are libraries that can do these kind of audio manipulation easily with least amount of code. One such is pydub.

You can install `pydub` as below and detail about dependencies are here `pip install pydub`

Using `pydub`, you can read different audio formats (`wav` in this case), convert them to audio-segment and then perform manipulations or simply play it.

You can also create an silent audio-segment of set period and add two segment with '+' operator.

Source Code

```
from pydub import AudioSegment
from pydub.playback import play

audio_in_file = "in_sine.wav"
audio_out_file = "out_sine.wav"

# create 1 sec of silence audio segment
one_sec_segment = AudioSegment.silent(duration=1000)  #duration in milliseconds

#read wav file to an audio segment
song = AudioSegment.from_wav(audio_in_file)

#Add above two audio segments    
final_song = one_sec_segment + song

#Either save modified audio
final_song.export(audio_out_file, format="wav")

#Or Play modified audio
play(final_song)
```

Adding silent frame to wav file using python

Solution

Problem