ffmpeg batch conversion

convert.ps1

$indir = Resolve-Path 'in';
$outdir = Resolve-Path 'out';

$ffmpegBin = Get-Command -Name 'ffmpeg' -All -CommandType Application -ea Stop

$inputArgs = (
	# '-loglevel', 'debug',

	# GPU decode
	# '-c:v', 'h264_cuvid',
	# '-c:v', 'mpeg4_cuvid' # (XVID)
	# '-c:v', 'hevc_cuvid'

	# '-init_hw_device', 'vulkan=vk:0',
	# '-hwaccel', 'vulkan',
	# '-hwaccel_output_format', 'cuda',

	'-hwaccel', 'cuda',
	'-hwaccel_output_format', 'cuda',

	'' # Allow trailing commas above
)

$outputArgs = (
	# Trim intros
	# '-ss', '00:00:10',

	# Video Codec
	# '-c:v', 'h264_nvenc',
	'-c:v', 'hevc_nvenc',
	# '-c:v', 'libaom-av1',

	# Bitrate
	# '-b:v', '1800k', # 1080p
	# '-b:v', '800k', # 720p
	# '-b:v', '300k', # 480p
	# '-rc', 'vbr',

	# Quality
	# '-crf', 28, # H264
	'-cq', 34, # HEVC

	'-preset',
		# 'slow', # hq 2 passes
		# 'medium', # hq 1 pass
		# 'fast', # hp 1 pass
		'p1', # fastest (lowest quality)
		# 'p2', # faster (lower quality)
		# 'p3', # fast (low quality)
		# 'p4', # medium (default)
		# 'p5', # slow (good quality)
		# 'p6', # slower (better quality)
		# 'p7', # slowest (best quality)

	# Audio codec
	# '-c:a', 'mp3',
	'-c:a', 'copy',

	# Downmix surround to stereo
	# '-ac', '2',

	# Subtitles
	'-c:s', 'copy',

	# Strip all metadata
	# '-map_metadata', -1,

	# 10-bit
	# '-pix_fmt', 'p010le',

	# Scaling
	# '-vf', 'scale=-2:1080',
	# '-vf', 'scale=-2:720',
	# '-vf', 'scale=-2:400',

	# Hardware scaling
	# NOTE: Only supports 8-bit
	'-vf', 'scale_cuda=w=1280:h=720:interp_algo=lanczos:force_original_aspect_ratio=1:force_divisible_by=2',

	# Error Fixes:
	# '-max_muxing_queue_size', 99999, # "Too many packets buffered for output stream 0:1."

	# Fix broken stereo (only left channel exists)
	# '-filter_complex', '[0:a] volume=2 [louder]; [louder] channelmap=channel_layout=mono:map=FL-FC [mono]', '-map', '0:v', '-map', '[mono]',

	'' # Allow trailing commas above
)

Get-ChildItem $indir -File -Recurse | ForEach-Object {
	$outsubdir = $_.Directory -replace [regex]::escape($indir), $outdir
	md -Force $outsubdir;
	& $ffmpegBin $inputArgs -i $_.FullName $outputArgs "$outsubdir\$($_.BaseName).mkv"
}

shutdown.exe /s /hybrid /t 60