a ffmpeg wrapper script to kill process when timeout

ffmpeg.sh

#!/bin/bash

trap 'echo ffmpegexit && pkill -P $$'  EXIT SIGINT SIGTERM SIGHUP

# Define the timeout duration in seconds for file change
TIMEOUT_IN_S=10
TOTAL_TIMEOUT_IN_S=7200

# Get the last argument as the output file
OUTPUT_FILE="${@: -1}"

# Get the full path of the current script's directory
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"

# Start ffmpeg with a timeout and all the arguments in the background using the full path
timeout --foreground $TOTAL_TIMEOUT_IN_S "$SCRIPT_DIR/ffmpeg" "$@" &
FFMPEG_PID=$!

# Initialize the last modification time
LAST_MOD_TIME=$(date +%s)


# Monitor the output file
while true; do
    # Get the current modification time
    CURRENT_MOD_TIME=$(stat -c %Y "$OUTPUT_FILE" 2>/dev/null || echo $LAST_MOD_TIME)

    # Check if the modification time has not changed
    if [[ "$LAST_MOD_TIME" -eq "$CURRENT_MOD_TIME" ]]; then
        # If the file hasn't changed for the specified timeout duration, terminate ffmpeg
        if [[ $(($(date +%s) - LAST_MOD_TIME)) -ge $TIMEOUT_IN_S ]]; then
            echo "ffmpeg error: timeout"
            pkill -P $$
            exit 0
        fi
    else
        # Update the last modification time
        LAST_MOD_TIME=$CURRENT_MOD_TIME
    fi

    # Wait for 1 second before checking again
    sleep 5
done