Pydub let's you do stuff to audio in a way that isn't stupid.
Open a WAV file
from pydub import AudioSegment
song = AudioSegment.from_wav("never_gonna_give_you_up.wav")...or an mp3
song = AudioSegment.from_mp3("never_gonna_give_you_up.mp3")... or an ogg, or flv, or anything else ffmpeg supports
ogg_version = AudioSegment.from_ogg("never_gonna_give_you_up.ogg")
flv_version = AudioSegment.from_flv("never_gonna_give_you_up.flv")
mp4_version = AudioSegment.from_file("never_gonna_give_you_up.mp4", "mp4")
wma_version = AudioSegment.from_file("never_gonna_give_you_up.wma", "wma")
aac_version = AudioSegment.from_file("never_gonna_give_you_up.aiff", "aac")Slice audio
# pydub does things in miliseconds
ten_seconds = 10 * 1000
first_10_seconds = song[:10000]
last_5_seconds = song[5000:]Make the beginning louder and the end quieter
# boost volume by 6dB
beginning = first_10_seconds + 6
# reduce volume by 3dB
end = last_5_seconds - 3Concatenate audio (add one file to the end of another)
without_the_middle = beginning + endAudioSegments are immutable
# song is not modified
backwards = song.reverse()Crossfade (again, beginning and end are not modified)
# 1.5 second crossfade
with_style = beginning.append(end, crossfade=1500)Repeat
# repeat the clip twice
do_it_over = with_style * 2Fade (note that you can chain operations because everything returns an AudioSegment)
# 2 sec fade in, 3 sec fade out
awesome = do_it_over.fade_in(2000).fade_out(3000)Save the results (again whatever ffmpeg supports)
awesome.export("mashup.mp3", format="mp3")You can pass an optional bitrate argument to export using any syntax ffmpeg supports.
awesome.export("mashup.mp3", format="mp3", bitrate="192k")Any further arguments supported by ffmpeg can be passed as a list in a 'parameters' argument, with switch first, argument second. Note that no validation takes place on these parameters, and you may be limited by what your particular build of ffmpeg supports.
# Use preset mp3 quality 0 (equivalent to lame V0)
awesome.export("mashup.mp3", format="mp3", parameters=["-q:a", "0"])
# Mix down to two channels and set hard output volume
awesome.export("mashup.mp3", format="mp3", parameters=["-ac", "2", "-vol", "150"])copy the pydub directory into your python path
-OR-
pip install pydub
requires ffmpeg for encoding and decoding all non-wav files (which work natively)
- ffmpeg (http://www.ffmpeg.org/)
AudioSegment objects are immutable
from glob import glob
from pydub import AudioSegment
playlist_songs = [AudioSegment.from_mp3(mp3_file) for mp3_file in glob("*.mp3")]
first_song = playlist_songs.pop(0)
# let's just include the first 30 seconds of the first song (slicing
# is done by milliseconds)
beginning_of_song = first_song[:30*1000]
playlist = beginning_of_song
for song in playlist_songs:
# We don't want an abrupt stop at the end, so let's do a 10 second crossfades
playlist.append(song, crossfade=(10 * 1000))
# let's fade out the end of the last song
playlist = playlist.fade_out(30)
# hmm I wonder how long it is... ( len(audio_segment) returns milliseconds )
playlist_length = len(playlist) / (1000*60)
# lets save it!
out_f = open("%s_minute_playlist.mp3" % playlist_length, 'wb')
playlist.export(out_f, format='mp3')Let's say you have a weekly podcast and you want to do the processing automatically.
For this example we're going to:
- Strip out the silence
- Add on the bumpers (intro/outro theme music)
from pydub import AudioSegment
from pydub.utils import db_to_float
# Let's load up the audio we need...
podcast = AudioSegment.from_mp3("podcast.mp3")
intro = AudioSegment.from_wav("intro.wav")
outro = AudioSegment.from_wav("outro.wav")
# Let's consider anything that is 30 decibels quieter than
# the average volume of the podcast to be silence
average_loudness = podcast.rms
silence_threshold = average_loudness * db_to_float(-30)
# filter out the silence
podcast_parts = (ms for ms in podcast if ms.rms > silence_threshold)
# combine all the chunks back together
podcast = reduce(lambda a, b: a + b, podcast_parts)
# add on the bumpers
podcast = intro + podcast + outro
# save the result
podcast.export("podcast_processed.mp3", format="mp3")Not bad!
License (MIT License)
Copyright © 2011 James Robert, http://jiaaro.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.