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• 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 ?

  


• Extract the 0th frame of every second on a live video

  14 avril 2020, par geo-freak

  I have a command to extract the zero-th frame of every second. I got the command from here.

  



  ffmpeg -i input.ts -vf "select=between(mod(n\, 25)\, 0\, 0), setpts=N/24/TB" output-%04d.png


  



  But when I run the above command on live feed, it is extracting more than 100000 frames. The above command is not working on a live recording. Can anyone suggest or help me to extract the very first frame on a live recording ? Thanks in advance.

  



  P.S : For my testing I am running the above command on a tcr video.

  


• How to convert orginal video into multiple quality like youtube by using ffmpeg ? [closed]

  21 avril 2021, par rahulchanchardbabaji

  I am creating a streaming app like youtube while I am creating it I am facing many challenges related to different quality video converting.

  


  


  1. Should I convert orginal video file into multiple video file (like 240p, 480p and 720p) and storage them ? Or there is anyway where I can create a single video file can the same.

     


  


  2. Which video format should I use MP4, HLS or DASH for fast streaming, support for every devices, take minimum space and support subtitles.