EDIT 1 for anyone with the same error: installing ffmpeg did indeed solve that BytesIO error
EDIT 1 for anyone still willing to help: my problem is now that when I AudioSegment.export("filename.mp3", format="mp3"), the file is made, but has size 0 bytes -- details below (as "EDIT 1")
EDIT 2: All problems now solved.
- Files can be read in as AudioSegment using BytesIO
- I found buildpacks to ensure ffmpeg was installed correctly on my app, with lame support for exporting proper mp3 files
Answer below
Original question
I have pydub working nicely locally to crop a particular mp3 file based on parameters in the url. (?start_time=3.8&end_time=5.1)
When I run foreman start it all looks good on localhost. The html renders nicely.
The key lines from the views.py include reading in a file from a url using
url = "https://s3.amazonaws.com/shareducate02/The_giving_tree__by_Alex_Blumberg__sponsored_by_mailchimp-short.mp3"
mp3 = urllib.urlopen(url).read() # inspired by http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter11_image/06_speech.ipynb
original=AudioSegment.from_mp3(BytesIO(mp3)) # AudioSegment.from_mp3 is a pydub command, see http://pydub.com
section = original[start_time_ms:end_time_ms]
That all works great... until I push to heroku (django app) and run it online. then when I load the same page now on the herokuapp.com, I get this error
OSError at /path/to/page
[Errno 2] No such file or directory
Request Method: GET
Request URL: http://my.website.com/path/to/page?start_time=3.8&end_time=5
Django Version: 1.6.5
Exception Type: OSError
Exception Value:
[Errno 2] No such file or directory
Exception Location: /app/.heroku/python/lib/python2.7/subprocess.py in _execute_child, line 1327
Python Executable: /app/.heroku/python/bin/python
Python Version: 2.7.8
Python Path:
['/app',
'/app/.heroku/python/bin',
'/app/.heroku/python/lib/python2.7/site-packages/setuptools-5.4.1-py2.7.egg',
'/app/.heroku/python/lib/python2.7/site-packages/distribute-0.6.36-py2.7.egg',
'/app/.heroku/python/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg',
'/app',
'/app/.heroku/python/lib/python27.zip',
'/app/.heroku/python/lib/python2.7',
'/app/.heroku/python/lib/python2.7/plat-linux2',
'/app/.heroku/python/lib/python2.7/lib-tk',
'/app/.heroku/python/lib/python2.7/lib-old',
'/app/.heroku/python/lib/python2.7/lib-dynload',
'/app/.heroku/python/lib/python2.7/site-packages',
'/app/.heroku/python/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg-info']
Traceback:
File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
112. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/app/evernote/views.py" in finalize
105. original=AudioSegment.from_mp3(BytesIO(mp3))
File "/app/.heroku/python/lib/python2.7/site-packages/pydub/audio_segment.py" in from_mp3
318. return cls.from_file(file, 'mp3')
File "/app/.heroku/python/lib/python2.7/site-packages/pydub/audio_segment.py" in from_file
302. retcode = subprocess.call(convertion_command, stderr=open(os.devnull))
File "/app/.heroku/python/lib/python2.7/subprocess.py" in call
522. return Popen(*popenargs, **kwargs).wait()
File "/app/.heroku/python/lib/python2.7/subprocess.py" in __init__
710. errread, errwrite)
File "/app/.heroku/python/lib/python2.7/subprocess.py" in _execute_child
1327. raise child_exception
I have commented out some of the original to convince myself that sure enough the single line original=AudioSegment.from_mp3(BytesIO(mp3)) is where the problem kicks in... but this is not a problem locally
The full function in views.py starts like this:
from django.shortcuts import render, get_object_or_404
from django.http import HttpResponseRedirect #, Http404, HttpResponse
from django.core.urlresolvers import reverse
from django.views import generic
import pydub
# Maybe only need:
from pydub import AudioSegment # == see below
from time import gmtime, strftime
import boto
from boto.s3.connection import S3Connection
from boto.s3.key import Key
# http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter11_image/06_speech.ipynb
import urllib
from io import BytesIO
# import numpy as np
# import scipy.signal as sg
# import pydub # mentioned above already
# import matplotlib.pyplot as plt
# from IPython.display import Audio, display
# import matplotlib as mpl
# %matplotlib inline
import os
# from settings import AWS_ACCESS_KEY, AWS_SECRET_KEY, AWS_BUCKET_NAME
AWS_ACCESS_KEY = os.environ.get('AWS_ACCESS_KEY') # there must be a better way?
AWS_SECRET_KEY = os.environ.get('AWS_SECRET_KEY')
AWS_BUCKET_NAME = os.environ.get('S3_BUCKET_NAME')
# http://stackoverflow.com/questions/415511/how-to-get-current-time-in-python
boto_conn = S3Connection(AWS_ACCESS_KEY, AWS_SECRET_KEY)
bucket = boto_conn.get_bucket(AWS_BUCKET_NAME)
s3_url_format = 'https://s3.amazonaws.com/shareducate02/{end_path}'
and specifically the view in views.py that's called when I visit the page:
def finalize(request):
start_time = request.GET.get('start_time')
end_time = request.GET.get('end_time')
original_file = "https://s3.amazonaws.com/shareducate02/The_giving_tree__by_Alex_Blumberg__sponsored_by_mailchimp-short.mp3"
if start_time:
# original=AudioSegment.from_mp3(original_file) #...that didn't work
# but this works below:
# next three uncommented lines from http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter11_image/06_speech.ipynb
# python 2.x
url = original_file
# req = urllib.Request(url, headers={'User-Agent': ''}) # Note: I commented out this because I got error that "Request" did not exist
mp3 = urllib.urlopen(url).read()
# That's for my 2.7
# If I ever upgrade to python 3.x, would need to change it to:
# req = urllib.request.Request(url, headers={'User-Agent': ''})
# mp3 = urllib.request.urlopen(req).read()
# as per instructions on http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter11_image/06_speech.ipynb
original=AudioSegment.from_mp3(BytesIO(mp3))
# original=AudioSegment.from_mp3("static/givingtree.mp3") # alternative that works locally (on laptop) but no use for heroku
start_time_ms = int(float(start_time) * 1000)
if end_time:
end_time_ms = int(float(end_time) * 1000)
else:
end_time_ms = int(float(original.duration_seconds) * 1000)
duration_ms = end_time_ms - start_time_ms
# duration = end_time - start_time
duration = duration_ms/1000
# section = original[start_time_ms:end_time_ms]
# section_with_fading = section.fade_in(100).fade_out(100)
clip = "demo-"
number = strftime("%Y-%m-%d_%H-%M-%S", gmtime())
clip += number
clip += ".mp3"
# DON'T BOTHER writing locally:
# clip_with_path = "evernote/static/"+clip
# section_with_fading.export(clip_with_path, format = "mp3")
# tempclip = section_with_fading.export(format = "mp3")
# commented out while de-bugging, but was working earlier if run on localhost
# c = boto.connect_s3()
# b = c.get_bucket(S3_BUCKET_NAME) # as defined above
# k = Key(b)
# k.key=clip
# # k.set_contents_from_filename(clip_with_path)
# k.set_contents_from_file(tempclip)
# k.set_acl('public-read')
clip_made = True
else:
duration = 0.0
clip_made = False
clip = ""
context = {'original_file':original_file, 'new_file':clip, 'start_time': start_time, 'end_time':end_time, 'duration':duration, 'clip_made':clip_made}
return render(request, 'finalize.html' , context)
Any suggestions?
Potentially related: I have ffmpeg installed locally
But have been unable to install it onto heroku, due to not understanding buildpacks. I tried just a moment ago (http://stackoverflow.com/questions/14407388/how-to-install-ffmpeg-for-a-django-app-on-heroku and https://github.com/shunjikonishi/heroku-buildpack-ffmpeg) but so far ffmpeg is not working on heroku (ffmpeg is not recognised when I do "heroku run ffmpeg --version")
...do you think this is the reason?
An answer like any of these would be much appreciated as I'm going round in circles here:
- "I think ffmpeg is indeed your problem. Try harder to sort that out, to get it installed on heroku"
- "Actually, I think this is why BytesIO is not working for you: ..."
- "Your approach is terrible anyway... if you want to read in an audio file to process using pydub, you should just do this instead: ..." (since I'm just hacking my way through pydub for my first time... my approach may be poor)
EDIT 1
ffmpeg is now installed (e.g., I can output wav files)
However, I can't create mp3 files, still... or more correctly, I can, but the filesize is zero
(venv-app)moriartymacbookair13:getstartapp macuser$ heroku config:add BUILDPACK_URL=https://github.com/ddollar/heroku-buildpack-multi.git
Setting config vars and restarting awe01... done, v93
BUILDPACK_URL: https://github.com/ddollar/heroku-buildpack-multi.git
(venv-app)moriartymacbookair13:getstartapp macuser$ vim .buildpacks
(venv-app)moriartymacbookair13:getstartapp macuser$ cat .buildpacks
https://github.com/shunjikonishi/heroku-buildpack-ffmpeg.git
https://github.com/heroku/heroku-buildpack-python.git
(venv-app)moriartymacbookair13:getstartapp macuser$ git add --all
(venv-app)moriartymacbookair13:getstartapp macuser$ git commit -m "need multi, not just ffmpeg, so adding back in multi + shun + heroku, with trailing .git in .buildpacks file"
[master cd99fef] need multi, not just ffmpeg, so adding back in multi + shun + heroku, with trailing .git in .buildpacks file
1 file changed, 2 insertions(+), 2 deletions(-)
(venv-app)moriartymacbookair13:getstartapp macuser$ git push heroku master
Fetching repository, done.
Counting objects: 5, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 372 bytes | 0 bytes/s, done.
Total 3 (delta 2), reused 0 (delta 0)
-----> Fetching custom git buildpack... done
-----> Multipack app detected
=====> Downloading Buildpack: https://github.com/shunjikonishi/heroku-buildpack-ffmpeg.git
=====> Detected Framework: ffmpeg
-----> Install ffmpeg
DOWNLOAD_URL = http://flect.github.io/heroku-binaries/libs/ffmpeg.tar.gz
exporting PATH and LIBRARY_PATH
=====> Downloading Buildpack: https://github.com/heroku/heroku-buildpack-python.git
=====> Detected Framework: Python
-----> Installing dependencies with pip
Cleaning up...
-----> Preparing static assets
Collectstatic configuration error. To debug, run:
$ heroku run python ./example/manage.py collectstatic --noinput
Using release configuration from last framework (Python).
-----> Discovering process types
Procfile declares types -> web
-----> Compressing... done, 198.1MB
-----> Launching... done, v94
http://[redacted].herokuapp.com/ deployed to Heroku
To git@heroku.com:awe01.git
78d6b68..cd99fef master -> master
(venv-app)moriartymacbookair13:getstartapp macuser$ heroku run ffmpeg
Running `ffmpeg` attached to terminal... up, run.6408
ffmpeg version git-2013-06-02-5711e4f Copyright (c) 2000-2013 the FFmpeg developers
built on Jun 2 2013 07:38:40 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
configuration: --enable-shared --disable-asm --prefix=/app/vendor/ffmpeg
libavutil 52. 34.100 / 52. 34.100
libavcodec 55. 13.100 / 55. 13.100
libavformat 55. 8.102 / 55. 8.102
libavdevice 55. 2.100 / 55. 2.100
libavfilter 3. 74.101 / 3. 74.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
Use -h to get full help or, even better, run 'man ffmpeg'
(venv-app)moriartymacbookair13:getstartapp macuser$ heroku run bash
Running `bash` attached to terminal... up, run.9660
~ $ python
Python 2.7.8 (default, Jul 9 2014, 20:47:08)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pydub
>>> from pydub import AudioSegment
>>> exit()
~ $ which ffmpeg
/app/vendor/ffmpeg/bin/ffmpeg
~ $ python
Python 2.7.8 (default, Jul 9 2014, 20:47:08)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pydub
>>> from pydub import AudioSegment
>>> AudioSegment.silent(5000).export("/tmp/asdf.mp3", "mp3")
<open file '/tmp/asdf.mp3', mode 'wb+' at 0x7f9a37d44780>
>>> exit ()
~ $ cd /tmp/
/tmp $ ls
asdf.mp3
/tmp $ open asdf.mp3
bash: open: command not found
/tmp $ ls -lah
total 8.0K
drwx------ 2 u36483 36483 4.0K 2014-10-22 04:14 .
drwxr-xr-x 14 root root 4.0K 2014-09-26 07:08 ..
-rw------- 1 u36483 36483 0 2014-10-22 04:14 asdf.mp3
Note the file size of 0 above for the mp3 file... when I do the same thing on my macbook, the file size is never zero
Back to the heroku shell:
/tmp $ python
Python 2.7.8 (default, Jul 9 2014, 20:47:08)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pydub
>>> from pydub import AudioSegment
>>> pydub.AudioSegment.ffmpeg = "/app/vendor/ffmpeg/bin/ffmpeg"
>>> AudioSegment.silence(1200).export("/tmp/herokuSilence.mp3", format="mp3")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: type object 'AudioSegment' has no attribute 'silence'
>>> AudioSegment.silent(1200).export("/tmp/herokuSilence.mp3", format="mp3")
<open file '/tmp/herokuSilence.mp3', mode 'wb+' at 0x7fcc2017c780>
>>> exit()
/tmp $ ls
asdf.mp3 herokuSilence.mp3
/tmp $ ls -lah
total 8.0K
drwx------ 2 u36483 36483 4.0K 2014-10-22 04:29 .
drwxr-xr-x 14 root root 4.0K 2014-09-26 07:08 ..
-rw------- 1 u36483 36483 0 2014-10-22 04:14 asdf.mp3
-rw------- 1 u36483 36483 0 2014-10-22 04:29 herokuSilence.mp3
I realised the first time that I had forgotten the pydub.AudioSegment.ffmpeg = "/app/vendor/ffmpeg/bin/ffmpeg" command, but as you can see above, the file is still zero size
Out of desperation, I even tried adding the ".heroku" into the path to be as verbatim as your example, but that didn't fix it:
/tmp $ python
Python 2.7.8 (default, Jul 9 2014, 20:47:08)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pydub
>>> from pydub import AudioSegment
>>> pydub.AudioSegment.ffmpeg = "/app/.heroku/vendor/ffmpeg/bin/ffmpeg"
>>> AudioSegment.silent(1200).export("/tmp/herokuSilence03.mp3", format="mp3")
<open file '/tmp/herokuSilence03.mp3', mode 'wb+' at 0x7fc92aca7780>
>>> exit()
/tmp $ ls -lah
total 8.0K
drwx------ 2 u36483 36483 4.0K 2014-10-22 04:31 .
drwxr-xr-x 14 root root 4.0K 2014-09-26 07:08 ..
-rw------- 1 u36483 36483 0 2014-10-22 04:14 asdf.mp3
-rw------- 1 u36483 36483 0 2014-10-22 04:31 herokuSilence03.mp3
-rw------- 1 u36483 36483 0 2014-10-22 04:29 herokuSilence.mp3
Finally, I tried exporting a .wav file to check pydub was at least working correctly
/tmp $ python
Python 2.7.8 (default, Jul 9 2014, 20:47:08)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pydub
>>> from pydub import AudioSegment
>>> pydub.AudioSegment.ffmpeg = "/app/vendor/ffmpeg/bin/ffmpeg"
>>> AudioSegment.silent(1300).export("/tmp/heroku_wav_silence01.wav", format="wav")
<open file '/tmp/heroku_wav_silence01.wav', mode 'wb+' at 0x7fa33cbf3780>
>>> exit()
/tmp $ ls
asdf.mp3 herokuSilence03.mp3 herokuSilence.mp3 heroku_wav_silence01.wav
/tmp $ ls -lah
total 40K
drwx------ 2 u36483 36483 4.0K 2014-10-22 04:42 .
drwxr-xr-x 14 root root 4.0K 2014-09-26 07:08 ..
-rw------- 1 u36483 36483 0 2014-10-22 04:14 asdf.mp3
-rw------- 1 u36483 36483 0 2014-10-22 04:31 herokuSilence03.mp3
-rw------- 1 u36483 36483 0 2014-10-22 04:29 herokuSilence.mp3
-rw------- 1 u36483 36483 29K 2014-10-22 04:42 heroku_wav_silence01.wav
/tmp $
At least that filesize for .wav is non-zero, so pydub is working
My current theory is that either I'm still not using ffmpeg correctly, or it's insufficient... maybe I need an mp3 additional install on top of basic ffmpeg.
Several sites mention "libavcodec-extra-53" but I'm not sure how to install that on heroku, or to check if I have it? https://github.com/jiaaro/pydub/issues/36
Similarly tutorials on libmp3lame seem to be geared towards laptop installation rather than installation on heroku, so I'm at a loss http://superuser.com/questions/196857/how-to-install-libmp3lame-for-ffmpeg
In case relevant, I also have youtube-dl in my requirements.txt... this also works locally on my macbook, but fails when I run it in the heroku shell:
~/ytdl $ youtube-dl --restrict-filenames -x --audio-format mp3 n2anDgdUHic
[youtube] Setting language
[youtube] Confirming age
[youtube] n2anDgdUHic: Downloading webpage
[youtube] n2anDgdUHic: Downloading video info webpage
[youtube] n2anDgdUHic: Extracting video information
[download] Destination: Boyce_Avenue_feat._Megan_Nicole_-_Skyscraper_Patrick_Ebert_Edit-n2anDgdUHic.m4a
[download] 100% of 5.92MiB in 00:00
[ffmpeg] Destination: Boyce_Avenue_feat._Megan_Nicole_-_Skyscraper_Patrick_Ebert_Edit-n2anDgdUHic.mp3
ERROR: audio conversion failed: Unknown encoder 'libmp3lame'
~/ytdl $
The informative link is that it too specificies an mp3 failure, so perhaps they two issues are related.
EDIT 2
See answer, all problems solved
