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• Can FFMPEG pause a live audio recording when db levels fall below threshold?

  30 April 2020, by DeepTrik

  I am in the process of converting 100's of audio cassettes to FLAC files. I have used Audacity and RecordPad by NCH Software to set decibel (dB) thresholds. so that when my devices stop and require a tape flip, the recording also pauses.

  



  I would like to move my tape playing devices (USB-based) to ubuntu 18.04 and run them on FFMPEG, but was wondering if FFMPEG had the ability to pause the recording when the audio signal falls below a configurable threshold.

  



  This helps me reduce the storage waste. Soon I have to convert some older audio reels as well in which the problem will get worse.

  



  The probe with Audacity is limited # of instances. If Audacity allowed me to instantiate multiple instances (1 for each playback device), I wouldn't be asking this question.

  



  I'm a bit of a noob to shell scripting...here is the end of my current shell script:

  



  nohup ffmpeg -nostdin -f alsa -i hw:"$DEVICE" -t $DURATION  -filter:a volumedetect -ar 48000 -ac 2 -b:a 320k "$TITLE".flac 2> "$TITLE".log &

  



  Thanks in advance!

  



  Deep

  


• using find in subprocess.call() gives error while the command executes properly from command prompt

  28 February 2018, by Devaraj GH

  C:\Windows\System32> ffmpeg -i D:\devaraj\KPIX_test.ts -vf "blackframe" -an -f n
  
  ull - 2>&1|find "Parsed" > D:\devaraj\info.txt

  this works fine , writes the file info.txt

  subprocess.call('ffmpeg' ,'-i', 'D:\devaraj\KPIX_test.ts' ,'-vf', '"blackframe"', 'D:\devaraj\KPIX_textfinal.mp3', '- 2>&1>','|','find', '"Parsed"', '>' ,'D:\devaraj\info.txt', 'shell=True')

  gives an error buffer size must be integer

  were as

  subprocess.call('ffmpeg -i D:\devaraj\KPIX_test.ts -vf "blackframe" -an -f n
  
  ull - 2>&1|find "Parsed" > D:\devaraj\info.txt', shell=True) 

  gives an error

  ’find’ is not recognized as an internal or external command,
  operable program or batch file.

  any help would be appreciated from d bottom of heart

• Restart environment and script during batch script

  7 December 2024, by ninbura

  I've built a few FFmpeg powershell scripts for me and a few others to use and I'm attempting to make the setup and update process as easy as possible. The end goal is to be able to run 1 batch file that installs Chocolatey, FFmpeg, git, clones the github repo (for updates), and edits the Windows registry to add the actual FFmpeg powershell scripts / console programs to the Windows Explorer contextual menu. This way I just pass them the folder containing everything once and any time I change or add something to the project I can just tell them to run the batch file again, and presto everything is up to date.

  



  However I'm struggling to find a way to install Chocolatey, then git with Chocolatey, and then run a git command with the execution of a single .bat file. From what I can tell after installing Chocolatey I need to restart the shell entirely before I can install git, and then I have to restart the shell again before I can use a git command. As of right now most of the actual processing is happening via Powershell scripts that are launched from the .bat file, and as each step is taken I update a txt file, attempt to restart the batch script, and read the txt file to pick up where I left off:

  



  @echo off
echo Administrative permissions required. Detecting permissions...
echo.

net session >nul 2>&1
if %errorLevel% == 0 (
    echo Success: Administrative permissions confirmed.
    echo.
) else (
    echo Failure: Current permissions inadequate.

    PAUSE

    exit
)

set relativePath=%~dp0
set relativePath=%relativePath:~0,-1%

PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\CheckRequiredPackages.ps1" -relativePath "%relativePath%"

set /p step=<"%relativePath%\Setup\Step.txt"

if %step% == 1 (
    (echo 2) > "%relativePath%\Setup\Step.txt"

    PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\GetChocolatey.ps1"

    start "" "%relativePath%\RunMe.bat"

    exit
) 

if %step% == 2 (
    (echo 3) > "%relativePath%\Setup\Step.txt"

    PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\GetRequiredPackages.ps1"

    start "" "%relativePath%\RunMe.bat"

    exit
) 

if %step% == 3 (
    (echo 0) > "%relativePath%\Setup\Step.txt"

    PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\Update.ps1" -relativePath "%relativePath%"
) 

PAUSE
Exit


  



  The problem is using the start command in the batch script doesn't seem to work, I'm guessing since that new process is spawned from the same process that handles the Chocolatey install it doesn't count as actually restarting the shell. Is there any way to actually restart the shell and somehow have the batch file start back up without user intervention?