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• avformat/asfenc : write group_mutual_exclusion_objects for audio on multiple languages

  5 février 2016, par Marton Balint

  avformat/asfenc : write group_mutual_exclusion_objects for audio on multiple languages
  Improves streaming compatibility with Windows Media Services. Also tested for
  
  compatilbility in Windows Media Player, Windows Media ASF Viewer and VLC.
  This version of the patch only writes exclusion among audio streams, therefore
  
  choosing a subtitle language should be possible independently of audio language.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/asf.c
  • [DH] libavformat/asf.h
  • [DH] libavformat/asfenc.c

• Rewind problem after convert *.mp3 to *.aac

  29 août 2020, par Vitaly Vesyolko

  I need to prepare audio files in MP3 format for sending via WhatsApp to Android and iOS devices with the ability to pause and mainly rewind.

  


  To do this, I use the ffmpeg utility on my notebook with Linux Ubuntu installed. Conversion example is described in detail here FFmpeg command to convert MP3 to AAC.

  


  As a result, I get AAC audio files that cannot be rewound in the WhatsApp player. I tried to set different options that are responsible for the output sound quality, size, and so on. But the ability to rewind in the WhatsApp player disappears.

  


  Rewind - is to slide by finger the circular slider in the WhatsApp audio player widget.

  


  I also used the following online services :

  


  

  1. ONLINE-CONVERT

  


  2. Convertio

  


  3. ZAMZAR.

  


  


  One of the first two in some cases saves files with the ability to rewind, but in most cases - without it. And it very likely depends on the original file size. This is a hypothesis - if the size is small, then it is possible to rewind the audio file in the WhatsApp player. In any case, this method is not universal.

  


  Please provide a universal solution to the task at hand - a CLI utility or a tool that would convert MP3 to AAC with the ability to rewind in the WhatsApp player. And please indicate which characteristics are responsible for the absence / presence of such functionality.

  


• How can I install ffmpeg if I'm using Cloud Foundry and a python buildpack

  14 juillet 2019, par david balague

  I’m writing a python application which uses pydub and want to run it in the cloud, I’m using IBM’s ibmcloud Cloud Foundry implementation to deploy the application.

  pydub requires access to ffmpeg. The python buildpacks do not include this tool.

  How can I install ffmpeg and make sure that pydub can access it from within my application ?

  I tried to copy ffmpeg within the app’s directory, even in the app’s root directory, but I get a
  [Errno 2] No such file or directory : ’ffprobe’ : ’ffprobe’
  meaning that pydub cannot access ffmpeg.

  I tried to include an additional buildpack (https://github.com/shunjikonishi/heroku-buildpack-ffmpeg) in my manifest.yaml

  Nothing worked

  this is my masked manifest.yaml

  applications :
   services :
  - xxx_de
  disk_quota : 1024M
  - name : ffmpeg
  buildpacks : https://github.com/shunjikonishi/heroku-buildpack-ffmpeg
  memory : 128M
   name : xvz
  #route : eu-gb.mybluemix.net
  route : mybluemix.net
  instances : 1
  memory : 128M

  Could you suggest a fix or an alternative way to do this ?

  Thanks !!