FFMPEG commands for stitching Blender videos

ffmpeg.sh

function stitch {
    if [ -z "$1" ]; then
        echo "Input prefix must be specified."
        return
    fi
    if [ -z "$2" ]; then
        echo "Output file must be specified."
        return
    fi
    if [ -z "$3" ]; then
        crf=18
    else
        crf=$3
    fi
    
    command="ffmpeg -r 30 -i ${1}%04d.png -c:v libx264 -crf $crf -pix_fmt yuv420p -f mp4 ${2}.mp4"
    eval $command
}

PowerShellProfile.ps1

function stitch($inputPrefix, $outputFile, $crf = 18) {
    if (-not $inputPrefix) {
        Write-Error "Input prefix must be specified."
        return
    }
    
    $cmd = "ffmpeg -r 30 -i ${inputPrefix}%04d.png -c:v libx264 -crf $crf -pix_fmt yuv420p -f mp4 $outputFile.mp4"
    Invoke-Expression $cmd
}