trim video

trim_video.sh

#!/bin/bash

# Check if ffmpeg is installed
command -v ffmpeg >/dev/null 2>&1 || { echo >&2 "ffmpeg is required but it's not installed. Exiting."; exit 1; }

# Check for valid number of arguments
if [ "$#" -ne 4 ]; then
    echo "Usage: $0 input.mp4 start_time end_time output_base_path"
    echo "Time format: HH:MM:SS or MM:SS"
    exit 1
fi

INPUT_FILE="$1"
START_TIME="$2"
END_TIME="$3"
OUTPUT_BASE_PATH="$4"

# Extracting the file name without the extension
BASE_NAME=$(basename -- "$INPUT_FILE")
FILE_NAME="${BASE_NAME%.*}"

# Replacing colons with dots in start and end times to make them file-name friendly
START_TIME_FILE=$(echo "$START_TIME" | tr ':' '.')
END_TIME_FILE=$(echo "$END_TIME" | tr ':' '.')

# Creating a unique output file name based on input file, start time, end time, and an index
INDEX=1
OUTPUT_FILE="$OUTPUT_BASE_PATH/$FILE_NAME"_trim"$INDEX"_"$START_TIME_FILE"-"$END_TIME_FILE".mp4
while [ -f "$OUTPUT_FILE" ]; do
  INDEX=$((INDEX+1))
  OUTPUT_FILE="$OUTPUT_BASE_PATH/$FILE_NAME"_trim"$INDEX"_"$START_TIME_FILE"-"$END_TIME_FILE".mp4
done

# Function to convert HH:MM:SS to seconds
time_to_seconds() {
  time=$1
  hours=$(echo $time | cut -d':' -f1)
  minutes=$(echo $time | cut -d':' -f2)
  seconds=$(echo $time | cut -d':' -f3 | awk '{printf "%.6f", $0}')
  total_seconds=$(echo "$hours * 3600 + $minutes * 60 + $seconds" | bc)
  echo $total_seconds
}

# Calculate duration for the trimmed part
START_TIME_SECONDS=$(time_to_seconds "$START_TIME")
END_TIME_SECONDS=$(time_to_seconds "$END_TIME")
DURATION=$(echo "$END_TIME_SECONDS - $START_TIME_SECONDS" | bc)

ffmpeg -i "$INPUT_FILE" -ss "$START_TIME" -t "$DURATION" -c:v copy -c:a copy "$OUTPUT_FILE"

echo "Trimmed video saved as $OUTPUT_FILE"