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• Monitoring for failure and quickly restarting systemd service

  16 février 2024, par mzrt

  I am running a 24/7 youtube stream on Ubuntu. My ffmpeg command is wrapped in a systemd service. On several occasions the ffmpeg command has failed and systemd has not restarted quickly enough to keep the youtube stream alive. When this happens I need to daemon-reload and restart the systemd service.

  


  To counter this I have written a bash script that checks the log for stream ending errors, however, it does not seem to be working. I have had failures since implementing this script, and it did not seem to have been triggered.

  


  two questions :

  


  

  1. is there a more efficient way to do what I am doing ?

  


  2. if not, can anyone identify what I am doing wrong ?

  


  


  #!/bin/bash

RESET=0

while true; do
    # Get the current time minus 1 minute
    LAST_1_MINUTE=$(date -d '1 minute ago' '+%b %e %H:%M:%S')
    
    # Run the command to check for the error within the last minute
    if journalctl --since "$LAST_1_MINUTE" | grep -qi "Error writing trailer"; then
        if [ $RESET -lt 1 ]; then
            # Perform actions if error is detected
            sudo systemctl daemon-reload && \
            echo "Restarting master.service by monitor.sh script at $(date)" >> /var/log/monitor.log && \
            sudo systemctl restart master.service
            RESET=2
        fi
    else
        RESET=$((RESET - 1))
    fi

    # Wait for 20 seconds before the next iteration
    sleep 20
done


  


• 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 ?

  


• FFMpeg Copy Live Stream (Limit to 60s file)

  17 février 2021, par Garret Harp

  I currently have a working way to get a live stream and start downloading it locally while it is still live.

  



  ffmpeg -i source_hls.m3u8 -c copy output.mkv -y

  



  The problem is I do not actually want to save the entire thing, I just periodically run another command on the output.mkv command to create a clip of part of the live stream.

  



  I was wondering if it was possible to limit the output.mkv file to be only 60s long so once the stream goes over 1 minute it will just cut off the old video and be replaced by the new rolling video.

  



  Is this possible or no ?