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• Reading in pydub AudioSegment from url. BytesIO returning "OSError [Errno 2] No such file or directory" on heroku only ; fine on localhost

  24 octobre 2014, par Mark

  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 :

  1. "I think ffmpeg is indeed your problem. Try harder to sort that out, to get it installed on heroku"
  2. "Actually, I think this is why BytesIO is not working for you : ..."
  3. "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="file"></open>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="file"></open>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
  
  </module></stdin>

  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="file"></open>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="file"></open>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

• HTML5 Video Chrome - ffmpeg - mp4 working in all but Chrome

  16 octobre 2014, par IIIOXIII

  I have successfully encoded a file to .mp4 using ffmpeg which will play in all tested devices (Safari on PC, IE on PC, Android Browser, Andriod Video Player, and Safari iPad), except for Chrome.

  As a work-around, I had planned to simply list the .ogg source prior to the .mp4 source so that chrome would play the .ogg source without even seeing the .mp4 source, however, I ran into the issue mentioned here.

  Basically, I am after the proper ffmpeg command which will encode an .mp4 video to standards which will play in Chrome - of course without losing playback functionality on any of the other previously mentioned platforms.

  I have tried several combinations, such as :

  ffmpeg -i [filename].wmv -vprofile baseline -level 30 -vf scale=640:-1 -movflags faststart [filename].mp4

  etc. but have not yet found the winning one.

  EDIT : I tried :

  ffmpeg_new -i [filename].wmv -strict experimental –acodec libvo_aacenc -ac 2 -ab 160k -vcodec libx264 -vf scale=640:-1 -pix_fmt yuv420p -preset slow -profile:v baseline -level 30 -maxrate 10000000 -bufsize 10000000 -b 1200k -f mp4 -threads 0 [filename].mp4

  And here is the ffmpeg output :

  ffmpeg version N-54207-ge59fb3f Copyright (c) 2000-2013 the FFmpeg developers built on Jun 25 2013 21:55:00 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 17.100 / 55. 17.100
  
    libavformat    55. 10.100 / 55. 10.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [asf @ 000000000254f9e0] Stream #0: not enough frames to estimate rate; consider
  
   increasing probesize
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, asf, from 'C:\vidtests\Wildlife.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand
  
   | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : ┬⌐ 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
    Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp
  
  , 192 kb/s
  
      Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x7
  
  20, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc
  
  Please use -b:a or -b:v, -b is ambiguous
  
  [libx264 @ 000000000264faa0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  
  
  
  [libx264 @ 000000000264faa0] profile Constrained Baseline, level 3.0
  
  [libx264 @ 000000000264faa0] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 r
  
  ef=5 deblock=1:0:0 analyse=0x1:0x111 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed
  
  _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pski
  
  p=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
  mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyi
  
  nt=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1
  
   bitrate=1200 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=10000
  
   vbv_bufsize=10000 nal_hrd=none ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'C:\vidtests\Wildlife_SE1.mp4':
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand
  
   | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : ┬⌐ 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
      encoder         : Lavf55.10.100
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
  
  40x360, q=-1--1, 1200 kb/s, 30k tbn, 29.97 tbc
  
      Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100
  
  Hz, stereo, s16, 160 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (vc1 -> libx264)
  
    Stream #0:0 -> #0:1 (wmav2 -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=   59 fps= 55 q=32.0 size=       0kB time=00:00:00.16 bitrate=   2.3kbits/
  
  frame=   66 fps= 42 q=31.0 size=       0kB time=00:00:00.40 bitrate=   1.0kbits/
  
  frame=   75 fps= 35 q=31.0 size=       0kB time=00:00:00.70 bitrate=   0.5kbits/
  
  frame=   84 fps= 31 q=31.0 size=       0kB time=00:00:01.00 bitrate=   0.4kbits/
  
  frame=   93 fps= 29 q=31.0 size=       0kB time=00:00:01.30 bitrate=   0.3kbits/
  
  frame=  102 fps= 27 q=31.0 size=       0kB time=00:00:01.60 bitrate=   0.2kbits/
  
  frame=  111 fps= 26 q=31.0 size=      38kB time=00:00:01.90 bitrate= 165.1kbits/
  
  Queue input is backward in time
  
  [mp4 @ 000000000264f2c0] Non-monotonous DTS in output stream 0:1; previous: 7616
  
  , current: 7063; changing to 7617. This may result in incorrect timestamps in th
  
  e output file.
  
  frame=  120 fps= 25 q=31.0 size=     107kB time=00:00:02.20 bitrate= 397.7kbits/
  
  frame=  128 fps= 24 q=31.0 size=     161kB time=00:00:02.46 bitrate= 534.1kbits/
  
  frame=  137 fps= 23 q=31.0 size=     194kB time=00:00:02.76 bitrate= 572.6kbits/
  
  frame=  145 fps= 23 q=31.0 size=     219kB time=00:00:03.03 bitrate= 592.1kbits/
  
  frame=  153 fps= 22 q=31.0 size=     273kB time=00:00:03.30 bitrate= 677.8kbits/
  
  frame=  162 fps= 22 q=31.0 size=     317kB time=00:00:03.60 bitrate= 720.8kbits/
  
  frame=  170 fps= 21 q=31.0 size=     366kB time=00:00:03.87 bitrate= 775.2kbits/
  
  frame=  177 fps= 21 q=31.0 size=     451kB time=00:00:04.10 bitrate= 900.2kbits/
  
  frame=  193 fps= 21 q=31.0 size=     602kB time=00:00:04.63 bitrate=1062.7kbits/
  
  frame=  208 fps= 22 q=30.0 size=     755kB time=00:00:05.13 bitrate=1204.2kbits/
  
  frame=  219 fps= 22 q=30.0 size=     769kB time=00:00:05.50 bitrate=1143.6kbits/
  
  frame=  228 fps= 21 q=30.0 size=     790kB time=00:00:05.80 bitrate=1114.5kbits/
  
  frame=  234 fps= 21 q=31.0 size=     806kB time=00:00:06.00 bitrate=1098.7kbits/
  
  frame=  243 fps= 21 q=31.0 size=     806kB time=00:00:06.30 bitrate=1046.4kbits/
  
  frame=  251 fps= 21 q=31.0 size=     831kB time=00:00:06.57 bitrate=1035.6kbits/
  
  frame=  260 fps= 20 q=31.0 size=     860kB time=00:00:06.87 bitrate=1024.6kbits/
  
  frame=  273 fps= 21 q=31.0 size=     934kB time=00:00:07.30 bitrate=1046.7kbits/
  
  frame=  288 fps= 21 q=30.0 size=    1019kB time=00:00:07.80 bitrate=1068.7kbits/
  
  frame=  302 fps= 21 q=30.0 size=    1066kB time=00:00:08.27 bitrate=1055.8kbits/
  
  frame=  314 fps= 21 q=29.0 size=    1146kB time=00:00:08.67 bitrate=1082.1kbits/
  
  frame=  328 fps= 21 q=28.0 size=    1189kB time=00:00:09.14 bitrate=1065.6kbits/
  
  frame=  341 fps= 21 q=28.0 size=    1247kB time=00:00:09.57 bitrate=1066.7kbits/
  
  frame=  352 fps= 22 q=27.0 size=    1274kB time=00:00:09.94 bitrate=1049.3kbits/
  
  frame=  365 fps= 22 q=27.0 size=    1298kB time=00:00:10.37 bitrate=1024.7kbits/
  
  frame=  376 fps= 22 q=27.0 size=    1349kB time=00:00:10.74 bitrate=1028.7kbits/
  
  frame=  388 fps= 22 q=26.0 size=    1378kB time=00:00:11.14 bitrate=1012.9kbits/
  
  frame=  401 fps= 22 q=26.0 size=    1415kB time=00:00:11.57 bitrate=1001.4kbits/
  
  frame=  412 fps= 22 q=26.0 size=    1454kB time=00:00:11.94 bitrate= 996.9kbits/
  
  frame=  421 fps= 22 q=27.0 size=    1489kB time=00:00:12.24 bitrate= 996.2kbits/
  
  frame=  431 fps= 21 q=27.0 size=    1509kB time=00:00:12.57 bitrate= 982.7kbits/
  
  frame=  441 fps= 21 q=28.0 size=    1555kB time=00:00:12.91 bitrate= 986.6kbits/
  
  frame=  450 fps= 21 q=28.0 size=    1599kB time=00:00:13.21 bitrate= 991.7kbits/
  
  frame=  460 fps= 21 q=28.0 size=    1621kB time=00:00:13.54 bitrate= 980.4kbits/
  
  frame=  470 fps= 21 q=28.0 size=    1660kB time=00:00:13.88 bitrate= 979.9kbits/
  
  frame=  480 fps= 21 q=28.0 size=    1734kB time=00:00:14.21 bitrate= 999.2kbits/
  
  frame=  489 fps= 21 q=29.0 size=    1834kB time=00:00:14.51 bitrate=1035.3kbits/
  
  frame=  499 fps= 21 q=29.0 size=    1890kB time=00:00:14.84 bitrate=1042.8kbits/
  
  frame=  508 fps= 21 q=29.0 size=    1962kB time=00:00:15.14 bitrate=1060.8kbits/
  
  frame=  519 fps= 21 q=29.0 size=    2061kB time=00:00:15.51 bitrate=1087.9kbits/
  
  frame=  531 fps= 21 q=29.0 size=    2189kB time=00:00:15.91 bitrate=1126.6kbits/
  
  frame=  540 fps= 21 q=29.0 size=    2329kB time=00:00:16.21 bitrate=1176.4kbits/
  
  frame=  551 fps= 21 q=29.0 size=    2439kB time=00:00:16.58 bitrate=1204.8kbits/
  
  frame=  562 fps= 21 q=29.0 size=    2569kB time=00:00:16.95 bitrate=1241.8kbits/
  
  frame=  575 fps= 21 q=29.0 size=    2688kB time=00:00:17.38 bitrate=1266.9kbits/
  
  frame=  581 fps= 21 q=29.0 size=    2749kB time=00:00:17.58 bitrate=1280.6kbits/
  
  frame=  589 fps= 21 q=29.0 size=    2785kB time=00:00:17.85 bitrate=1278.1kbits/
  
  frame=  595 fps= 21 q=30.0 size=    2808kB time=00:00:18.05 bitrate=1274.5kbits/
  
  frame=  602 fps= 20 q=30.0 size=    2903kB time=00:00:18.28 bitrate=1300.7kbits/
  
  frame=  610 fps= 20 q=31.0 size=    3008kB time=00:00:18.55 bitrate=1328.2kbits/
  
  frame=  616 fps= 20 q=31.0 size=    3128kB time=00:00:18.75 bitrate=1366.6kbits/
  
  frame=  625 fps= 20 q=31.0 size=    3238kB time=00:00:19.05 bitrate=1392.5kbits/
  
  frame=  633 fps= 20 q=31.0 size=    3320kB time=00:00:19.31 bitrate=1407.9kbits/
  
  frame=  642 fps= 20 q=31.0 size=    3397kB time=00:00:19.61 bitrate=1418.4kbits/
  
  frame=  652 fps= 20 q=31.0 size=    3437kB time=00:00:19.95 bitrate=1411.1kbits/
  
  frame=  661 fps= 20 q=31.0 size=    3511kB time=00:00:20.25 bitrate=1420.3kbits/
  
  frame=  669 fps= 20 q=31.0 size=    3578kB time=00:00:20.52 bitrate=1428.2kbits/
  
  frame=  679 fps= 20 q=31.0 size=    3606kB time=00:00:20.85 bitrate=1416.6kbits/
  
  frame=  691 fps= 20 q=32.0 size=    3670kB time=00:00:21.25 bitrate=1414.5kbits/
  
  frame=  701 fps= 20 q=32.0 size=    3798kB time=00:00:21.58 bitrate=1441.2kbits/
  
  frame=  713 fps= 20 q=32.0 size=    3901kB time=00:00:21.98 bitrate=1453.3kbits/
  
  frame=  723 fps= 20 q=32.0 size=    3969kB time=00:00:22.32 bitrate=1456.6kbits/
  
  frame=  735 fps= 20 q=32.0 size=    4027kB time=00:00:22.72 bitrate=1451.7kbits/
  
  frame=  744 fps= 20 q=32.0 size=    4102kB time=00:00:23.02 bitrate=1459.6kbits/
  
  frame=  755 fps= 20 q=32.0 size=    4135kB time=00:00:23.39 bitrate=1448.3kbits/
  
  frame=  764 fps= 20 q=32.0 size=    4172kB time=00:00:23.69 bitrate=1442.7kbits/
  
  frame=  776 fps= 20 q=32.0 size=    4216kB time=00:00:24.09 bitrate=1433.5kbits/
  
  frame=  787 fps= 20 q=32.0 size=    4254kB time=00:00:24.45 bitrate=1424.8kbits/
  
  frame=  802 fps= 20 q=32.0 size=    4337kB time=00:00:24.95 bitrate=1423.6kbits/
  
  frame=  815 fps= 20 q=32.0 size=    4369kB time=00:00:25.39 bitrate=1409.6kbits/
  
  frame=  828 fps= 20 q=32.0 size=    4450kB time=00:00:25.82 bitrate=1411.5kbits/
  
  frame=  840 fps= 20 q=32.0 size=    4467kB time=00:00:26.22 bitrate=1395.3kbits/
  
  frame=  852 fps= 20 q=32.0 size=    4550kB time=00:00:26.62 bitrate=1399.8kbits/
  
  frame=  865 fps= 20 q=32.0 size=    4594kB time=00:00:27.06 bitrate=1390.7kbits/
  
  frame=  877 fps= 20 q=32.0 size=    4629kB time=00:00:27.46 bitrate=1380.9kbits/
  
  frame=  889 fps= 20 q=32.0 size=    4689kB time=00:00:27.86 bitrate=1378.6kbits/
  
  frame=  900 fps= 20 q=32.0 size=    4740kB time=00:00:28.22 bitrate=1375.6kbits/
  
  frame=  901 fps= 19 q=-1.0 Lsize=    5203kB time=00:00:30.10 bitrate=1416.0kbits
  
  /s
  
  video:4586kB audio:590kB subtitle:0 global headers:0kB muxing overhead 0.532558%
  
  
  
  [libx264 @ 000000000264faa0] frame I:8     Avg QP:22.98  size: 31700
  
  [libx264 @ 000000000264faa0] frame P:893   Avg QP:27.55  size:  4974
  
  [libx264 @ 000000000264faa0] mb I  I16..4: 34.6%  0.0% 65.4%
  
  [libx264 @ 000000000264faa0] mb P  I16..4:  0.8%  0.0%  1.5%  P16..4: 41.4% 18.8
  
  %  8.5%  0.0%  0.0%    skip:29.0%
  
  [libx264 @ 000000000264faa0] final ratefactor: 24.50
  
  [libx264 @ 000000000264faa0] coded y,uvDC,uvAC intra: 64.3% 76.0% 36.7% inter: 2
  
  3.5% 19.6% 0.7%
  
  [libx264 @ 000000000264faa0] i16 v,h,dc,p: 34% 33% 11% 22%
  
  [libx264 @ 000000000264faa0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 16% 12%  9% 12%
  
  11% 12%  7%  8%
  
  [libx264 @ 000000000264faa0] i8c dc,h,v,p: 55% 23% 14%  7%
  
  [libx264 @ 000000000264faa0] ref P L0: 72.3% 12.0%  8.1%  3.7%  3.9%
  
  [libx264 @ 000000000264faa0] kb/s:1249.53

  But still no luck. The .mp4 will play in every compatible device/browser combination I have tried except for chrome.. Any advice ?

  TIA.

• Problem opening xvid264 with avcodec_alloc_context(NULL)

  12 juillet 2024, par user3763774

  I want to multiplex audio and video together using the ffmpeg encoding library with xvid264rgb codec. I can open the codec when I create the context specifying that codec, but not if I use NULL for the argument with allocate context. My understanding is I need to use NULL so I can open the audio codec as well.

  


  In the example, the first open works with codec indicated in the allocate context. The second doesn't.

  


  #include &#xA;#include &#xA;#include &#xA;#include <libavcodec></libavcodec>avcodec.h>&#xA;#include <libavutil></libavutil>opt.h>&#xA;#define WIDTH 400&#xA;#define HEIGHT 300&#xA;&#xA;const AVCodec *videocodec;&#xA;&#xA;bool init_video_encoder(AVCodecContext *c, int width, int height) {&#xA;    int ret;&#xA;    &#xA;    const AVRational tb_rat = {1, 30};&#xA;    const AVRational fr_rat = {30, 1};&#xA;&#xA;    fprintf(stderr, "init video encoder\n");&#xA;    // video&#xA;    //fprintf(stderr, "speed= %d \n", videocodec->speed);&#xA;    c->bit_rate = 400000;&#xA;    c->width = width;&#xA;    c->height = height;&#xA;    c->time_base = tb_rat;&#xA;    c->framerate = fr_rat;&#xA;    c->gop_size = 10;&#xA;    c->max_b_frames = 1;&#xA;    c->pix_fmt = AV_PIX_FMT_RGB24;&#xA;    if( videocodec->id == AV_CODEC_ID_H264 ) &#xA;        av_opt_set(c->priv_data, "preset", "slow", 0);&#xA;        &#xA;    ret = avcodec_open2(c, videocodec, NULL);&#xA;    if( ret &lt; 0 ) {&#xA;        fprintf(stderr, "failure to open codec: %s\n", av_err2str(ret));&#xA;        return false;&#xA;    }&#xA;    //avcodec_free_context(&amp;c);&#xA;    return true;&#xA;}&#xA;&#xA;int main(int argc, char **argv) {&#xA;&#xA;    AVCodecContext *context = NULL;&#xA;&#xA;    videocodec = avcodec_find_encoder_by_name("libx264rgb");&#xA;    if( videocodec == NULL ) {&#xA;        fprintf(stderr, "video encoder &#x27;libx264rgb&#x27; not found");&#xA;        exit;&#xA;    }&#xA;&#xA;    context = avcodec_alloc_context3(videocodec);&#xA;    if( context == NULL ) {&#xA;        fprintf(stderr, "could not allocate context with codec");&#xA;        return false;&#xA;    }&#xA;    if( init_video_encoder( context, WIDTH, HEIGHT ) ) &#xA;        fprintf(stderr, " success initializing video encoder case one\n");&#xA;    else&#xA;        fprintf(stderr, " failure to initialize video encoder case one\n");&#xA;    avcodec_close( context );&#xA;&#xA;    context = avcodec_alloc_context3(NULL);&#xA;    if( context == NULL ) {&#xA;        fprintf(stderr, "could not allocate context without codec");&#xA;        return false;&#xA;    }&#xA;    if( init_video_encoder( context, WIDTH, HEIGHT ) ) &#xA;        fprintf(stderr, " success initializing video encoder case two\n");&#xA;    else&#xA;        fprintf(stderr, " failure to initialize video encoder case two\n");&#xA;    avcodec_close( context );&#xA;}&#xA;

  


  Here is the error message :

  


  broken ffmpeg default settings detected&#xA;use an encoding preset (e.g. -vpre medium)&#xA;preset usage: -vpre <speed> -vpre <profile>&#xA;speed presets are listed in x264 --help&#xA;profile is optional; x264 defaults to high&#xA;failure to open codec: Generic error in an external library&#xA;failure to initialize video encoder case two&#xA;</profile></speed>

  


  Is this the right approach to use ? How do I set the encoding preset ? The code appears already to do that.