Takes a video file and trims it to a specified time range, while also adjusting quality for a smaller, shareable size.

shrinkvid.ps1

# Takes a video file and trims it to a specified time range, while also
# adjusting quality for a smaller, shareable size.
#
# Example usage:
# .\shrinkvid.ps1 video.mp4 00:00:10 00:00:20
#
# This will invoke ffmpeg with the following command:
# ffmpeg -i "video.mp4" -vf scale=-2:720 -r 60 -crf 28 -ss 00:00:10 -to 00:00:20 "video_small.mp4"
#
# Make sure ffmpeg.exe is in your PATH

param (
    [string]$FilePath,       # Input file path
    [string]$StartTime,      # Start time for trimming
    [string]$EndTime         # End time for trimming
)

# Check if ffmpeg is installed and accessible
if (-not (Get-Command "ffmpeg" -ErrorAction SilentlyContinue)) {
    Write-Host "Error: ffmpeg is not installed or not in the system's PATH." -ForegroundColor Red
    exit 1
}

# Extract file extension and create modified output filename
$Extension = [System.IO.Path]::GetExtension($FilePath)
$FileNameWithoutExtension = [System.IO.Path]::GetFileNameWithoutExtension($FilePath)
$Directory = [System.IO.Path]::GetDirectoryName($FilePath)
$OutputFilePath = Join-Path $Directory "$($FileNameWithoutExtension)_small$Extension"

# Construct and run the ffmpeg command
$ffmpegCommand = @(
    "ffmpeg",
    "-i", "`"$FilePath`"",
    "-vf", "scale=-2:720", # Change height to 720px, keep aspect ratio
    "-r", "60", # Set frame rate to 60fps
    "-crf", "28", # Set quality to 28. Lower is better quality/bigger file
    "-ss", $StartTime,
    "-to", $EndTime,
    "`"$OutputFilePath`""
) -join " "

Write-Host "Executing ffmpeg command: $ffmpegCommand" -ForegroundColor Green
Invoke-Expression $ffmpegCommand