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• How do I write a batch file that opens a msys shell and then run commands in the shell ?

  19 septembre 2024, par cxu

  I'm trying to automate the process of building ffmpeg on Windows 10. I'm following the guide here : https://trac.ffmpeg.org/wiki/CompilationGuide/MSVC

  



  Everything works fine when I do it manually, however I want to write a batch file that I can run to go through the entire process automatically.

  



  Building requires me to set up the Visual Studio environment and the MSYS environment. This is where I'm having trouble, since running the MSYS environment opens up a new shell. I want to pass the configure/make/make install commands to the MSYS shell after it is opened.

  



  I've tried the solution here : How to open a new shell in cmd,then run script in a new shell ?

  



  The problem they had looks similar to mine, but the solutions posted there didn't work for me.

  



  Here is the bat file currently :

  



  call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\vcvars64.bat"
call "C:\workspace\windows\mingw-get\msys\1.0\msys.bat" start cmd.exe /k bscript
pause


  



  and bscript :

  



  ./configure --enable-shared --toolchain=msvc --arch=amd64
make
make install


  



  I've tried all sorts of variations like :

  



  call "C:\workspace\windows\mingw-get\msys\1.0\msys.bat" /k bscript
call "C:\workspace\windows\mingw-get\msys\1.0\msys.bat" bscript
start "C:\workspace\windows\mingw-get\msys\1.0\msys.bat" /k bscript
start "C:\workspace\windows\mingw-get\msys\1.0\msys.bat" bscript


  



  And I've also tried leaving the bscript code in the original batch file.

  



  The configure/make commands will either run in the original cmd window, a new cmd window or wont run at all.

  



  Is there a way to pass commands to the MSYS shell like that ?

  


• FFMPEG [SHELL CMD] cutting last x frames [SHELL CMD] combining videos

  25 avril 2014, par user1708604

  .mp4 videos in 1920 x 1080, 25 frames / second
  different length

  Two commands needed :

  0) One command should delete x frames from the end of the video and create a new video without the last x frames as .mp4, save it in folder y
  1) One command should combine x amount of videos to one new video

  Just for info : I am using Python to call ffmpeg.
  Platform : Windows or CentOS.

  Many thanks in advance. :)

• subprocess.Popen can't find the file when shell=False and doesn't know ffmpeg when shell=True [duplicate]

  26 novembre 2023, par Waschbrettwade

  I am trying to get an offline speech-to-text library called "vosk" running following this tutorial : https://medium.com/@johnidouglasmarangon/automatic-speech-recognition-with-vosk-828569219f2b

  


  In this, subprocess.Popen is being used like this :

  


  ffmpeg_command = [
            "ffmpeg",
            "-nostdin",
            "-loglevel",
            "quiet",
            "-i",
            filename,
            "-ar",
            str(SAMPLE_RATE),
            "-ac",
            "1",
            "-f",
            "s16le",
            "-",
        ]

    with subprocess.Popen(ffmpeg_command, stdout=subprocess.PIPE) as process:


  


  When running this in Jupyter Notebook, no problem at all. But whenever I run this in VSCode, it produces the error :

  


  FileNotFoundError: [WinError 2] The system couldn't find the specified file (translated to English by me)


  


  When using shell=True as in

  


  with subprocess.Popen(ffmpeg_command, stdout=subprocess.PIPE, shell=True) as process:


  


  it tells me in the terminal (translated) :

  


  The command "ffmpeg" ist either written wrong or couldn't be found. 


  


  Do you have any idea what's causing these issues and how to fix them ?