ffmpegでフレーム数を上に表示させる

ffmpeg_frames.ps1

ffmpeg -i '.\2021-08-07 05-38-37.mkv' -vf "drawtext=fontfile=meiryo.ttc:text=%{n}:x=(w-tw)/2:y=h-(2*1h):fontcolor=white:box=1:boxcolor=0x00000099:fontsize=72" -y -c:v h264_nvenc test.mkv

output_frames.ps1

Param(
    [string]$Target,
    [string]$Output = "frames.mkv"
    )

$TargetFile = Resolve-Path $Target

$FFmpegArgs = @('-i ', "`"$TargetFile`"", '-vf "drawtext=fontfile=meiryo.ttc:text=%{n}:x=(w-tw)/2:y=h-(2*1h):fontcolor=white:box=1:boxcolor=0x00000099:fontsize=72"', '-y', '-c:v h264_nvenc', "`"$Output`"")
$arg = $FFmpegArgs -join " "
$arg = 'ffmpeg ' + $arg
Write-Host $arg

Invoke-Expression $arg