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• Can't call FFMPEG from CMD after installing chocolatey+ffmpeg on windows docker container

  19 novembre 2022, par Adil Abdul Rahman

  I have a C# code that is dependent on FFMPEG via CMD/powershell. I am trying to run CLI ffmpeg via a C# code in a windows container with sdk:6.0-windowsservercore-ltsc2022. I found this guide(use 12ft.io to bypass paywall) that says to install chocolatey and then install ffmpeg through that like so :

  


  USER ContainerAdministrator
EXPOSE 3389/tcp


RUN powershell.exe \
  Set-ExecutionPolicy Bypass -Scope Process -Force; \
  iwr -Uri 'https://community.chocolatey.org/install.ps1' -UseBasicParsing -OutFile $home/choco_install.ps1; \
  powershell $home/choco_install.ps1; \
  del $home/choco_install.ps1; \
  choco; \
  exit 0;
  
RUN powershell.exe \
  powershell choco install chocolatey-compatibility.extension -y --force; \
  powershell choco install chocolatey-core.extension -y --force; \
  powershell choco install ffmpeg-full -y --force; \
  ffmpeg; \
  exit 0;


  


  ( I am using this guide for C# dockerfile )

  


  And my C# Code :

  


  string command = $"/C ffmpeg -i \"{VideoUri}\" -vn -ac 1 {outputName}.mp3";
Process.Start("cmd.exe", command).WaitForExit();


  


  But I am running into some trouble. My C# code throws this error :

  


  'ffmpeg' is not recognized as an internal or external command, operable program or batch file.

  


  I have tried calling FFMPEG from the dockerfile to test if it has installed but it just returns this :

  


  Step 5/17 : RUN powershell.exe   powershell choco install chocolatey-compatibility.extension -y --force;   powershell choco install chocolatey-core.extension -y --force;   powershell choco install ffmpeg-full -y --force;   ffmpeg;   exit 0;
 ---> Using cache
 ---> 83b2941d03e6


  


• Android Get only Audio Stream of Online Video ?

  19 avril 2014, par user1575044

  I am beginner in Android, basically I want to get only audio stream of an online streaming video, so that I don't have to download video just download audio part of video only as an mp3 file(saving lot of data if you only need it as an mp3 file). I researched and got to know it can be done maybe using ffmpeg. Can someone guide me in this, some tutorials links or sample code would be beneficial.

  Thank You !!

• aacenc_tns : rework TNS descision logic

  17 octobre 2015, par Rostislav Pehlivanov

  aacenc_tns : rework TNS descision logic
  Changes :
  
   - strongly prefer dual filters to a single filter
  
   - less strict about using 2 filters w.r.t. energy
  
   - scrap the usage of threshold and spread, useless
  
   - use odd-shaped windows to set the filter direction
  
   - use 4 bits instead of 3 bits for short windows
  
   - simplify and reduce the main loop to a single level
  
   - add stricter regulations for short windows
  All of this now makes the TNS implementation operate
  
  as good as it can and it definitely shows. The frequency
  
  thresholds are now even better defined by looking at
  
  the spectrals and the overall sound has been improved at
  
  the price of just a few bits that are well worth it.
  

  • [DH] libavcodec/aacenc_tns.c
  • [DH] libavcodec/aacenc_tns.h