FFMPEG reencode helper script

reencode

#!/usr/bin/perl

use strict;
use warnings;
use Data::Dump::Color;
use File::Basename;
use Getopt::Long;
use JSON::PP;
use Cwd 3.75 qw(abs_path);
use Time::HiRes qw(time);
use Encode;

binmode(STDOUT, ":utf8");

###############################################################################
###############################################################################

my $crf           = undef;
my $outdir        = "";
my $preset        = "";
my $height        = 0;
my $hevc          = 1;
my $h264          = 0;
my $sample        = 0;
my $quiet         = 0;
my $debug         = 0;
my $keep          = 0;
my $keep_surround = 0;
my $info          = 0;
my $verbose       = 0;
my $eight_bit     = 0;
my $dry           = 0;
my $yify          = 0;
my $sanitize      = 0;
my $aac           = 0;
my ($res_480, $res_720, $res_1080);
my @params;

my $script_start = time();

my $ok = GetOptions(
	"outdir=s"   => \$outdir,
	"crf=i"      => \$crf,
	"height|h=i" => \$height,
	"hevc"       => \$hevc,
	"h264"       => \$h264,
	"sample"     => \$sample,
	"preset=s"   => \$preset,
	"quiet"      => \$quiet,
	"debug"      => \$debug,
	"keep"       => \$keep,
	"surround"   => \$keep_surround,
	"info"       => \$info,
	"verbose"    => \$verbose,
	"480p"       => \$res_480,
	"720p"       => \$res_720,
	"1080p"      => \$res_1080,
	"8bit"       => \$eight_bit,
	"dry"        => \$dry,
	"yify"       => \$yify,
	"sanitize"   => \$sanitize,
	"aac"        => \$aac,
);

if (!$ok) {
	die(usage());
}

if ($h264) {
	$hevc = 0;
}

if ($res_480) {
	$height = 480;
} elsif ($res_720) {
	$height = 720;
} elsif ($res_1080) {
	$height = 1080;
}

# If we're outputting to another directory, keep is implied
if ($outdir) {
	$keep = 1;
}

if ($yify) {
	$keep          = 1;
	$height        = 720;
	$hevc          = 1;
	$keep_surround = 0;   # Convert to stereo
	$crf           = 26;
}

# Build an array of readable files to encode
my @files;
foreach my $file (@ARGV) {
	$file = Encode::decode('utf8', $file);

	if (-r $file && -f $file) {
		push(@files, $file);
	} elsif (!-f $file) {
		printf("%sWarning:%s Skipping '%s' as it's not a file\n", color("yellow"), color("reset"), $file);
	} else {
		printf("%sWarning:%s Skipping '%s' as it's not readable\n", color("yellow"), color("reset"), $file);
	}
}

if (!@files) {
	print "Usage: reencode [file1.mp4] [file2.mkv] ...\n";

	# If there are files then show the info for all of them
	@files = sort(glob("./*.mp4"), glob("./*.mkv"));

	foreach my $x (@files) {
		$x = Encode::decode('utf8', $x);
	}

	if (!@ARGV && @files) {
		print "\n";
		$info = 1;
	} else {
		exit(9);
	}
}

my $vid_codec = "h264";
if ($hevc) {
	push(@params, "-c:v");
	push(@params, "hevc");

	$vid_codec = "hevc";
}

if ($crf) {
	push(@params, "-crf");
	push(@params, "$crf");
}

if ($preset) {
	push(@params, "-preset");
	push(@params, $preset);
}

# Sample only does the first X seconds
if ($sample) {
	push(@params, "-t");
	push(@params, "90");

	# We definitely keep the original file if we're only making a sample
	$keep = 1;
}

if (!$debug) {
	push(@params, "-loglevel");
	push(@params, "quiet");
}

# Don't output the ffmpeg encoding status (it's really verbose)
if (!$quiet) {
	push(@params, "-stats");
}

if ($eight_bit) {
	push(@params, "-pix_fmt");
	push(@params, "yuv420p");
}

my $total_size       = 0;
my $total_compressed = 0;
my $tmp_outdir       = '';

foreach my $infile (@files) {
	my $base = basename($infile);
	my $sum  = show_video_summary($infile);

	my $orig_height = get_video_height($infile);
	if ($orig_height < $height) {
		my $orange = color('orange');
		my $reset  = color();
		print $orange . "Warning:$reset disabling upscaling ($orig_height < $height)\n";
		$height = $orig_height;
	}

	# Scale the video if applicable
	if ($height > 100) {
		push(@params, "-vf");
		push(@params, "scale=-2:$height");
	}

	my $aud_channels = $sum->{audio}->[0]->{channels} || 0;
	my $is_surround  = ($aud_channels > 2);

	my @aud_params;
	my $aud_codec;

	if ($aac || ($is_surround && !$keep_surround)) {
		# Default to aac @ 128Kb/s
		push(@aud_params, "-c:a");
		push(@aud_params, "aac");
		push(@aud_params, "-b:a");
		push(@aud_params, "128k");

		# Two audio channels
		push(@aud_params, "-ac");
		push(@aud_params, "2");

		$aud_codec = "2.0 [aac @ 128Kb/s]";
	} else {
		push(@aud_params, "-c:a");
		push(@aud_params, "copy");

		$aud_codec = "*COPY*";
	}

	# If we're doing info, don't process anything else
	if ($info) {
		next;
	}

	$base =~ s/\.(mp4|avi|mkv)//ig;

	# Remove some common strings from the file name
	$base =~ s/(1080p|\d\d\dp|HEVC|x265|x264|h.264|-TBS|-strife|-MeGusta|-mSD|-NhaNc3)//gi;

	my $orig = $base;

	if ($sanitize) {
		$base = sanitize($base,'.');
	} else {
		# Remove and double/triple "." from the filename
		$base =~ s/\.+/./ig;
		# Remove ".-"
		$base =~ s/\.-/./ig;
		# Remove "()"
		$base =~ s/\(\)//ig;
	}

	my @prefix;
	push(@prefix, "ffmpeg");
	push(@prefix, "-y");
	push(@prefix, "-i");
	push(@prefix, $infile);

	# If we don't have a specified outdir, we use the same dir the input file is in
	if (!$outdir || $tmp_outdir) {
		$tmp_outdir = dirname($infile) . "/";
		$outdir     = $tmp_outdir;
	}

	# If we have an output directory append a / for safety
	if ($outdir) {
		$outdir .= "/";
		# Make sure there is only one trailing /
		$outdir =~ s|\/+$|\/|g;
	}

	# If there is an output dir make sure we can write to it
	if ($outdir && !(-w -d $outdir)) {
		my $str = sprintf("\n%sError:%s $outdir is not writable\n", color('red'), color('reset'));
		die($str);
	}

	# If there is no output dir assume ./
	if (!$outdir && (!-w -d "./")) {
		my $path = abs_path("./");
		my $str  = sprintf("\n%sError:%s $path is not writable\n", color('red'), color('reset'));
		die($str);
	}

	$base = trim($base);
	my $outfile = $outdir . $base;

	if ($outfile !~ /\.mkv/) {
		$outfile .= ".mkv";
	}

	if ($hevc) {
		$outfile =~ s/\.mkv/.hevc.mkv/g;
	}

	if ($yify) {
		$outfile =~ s/\.mkv/.tablet.mkv/g;
	}

	my @cmd_full = (@prefix, @aud_params, @params, $outfile);

	# Are the input/output filenames/paths the same
	my $same = abs_path($infile) eq abs_path($outfile);

	if ($same) {
		printf("%sWarning:%s Skipping '%s' because the input/output file names are the same\n", color("yellow"), color("reset"), $base);
		next;
	}

	my @escaped = @cmd_full;
	# Put quotes around anything with a *space* in it
	foreach my $i (@escaped) {
		if ($i =~ / /) {
			$i = "'$i'";
		}
	}

	if ($dry) {
		my $cmd = join(" ", @escaped);
		print "CMD: $cmd\n\n";
		exit(7);
	}

	# Print out the full command params, and then run it
	my $start = time();
	print "\n";

	if ($verbose) {
		dd(\@cmd_full);
	}


	printf("== OUTPUT ==\n");
	printf("  File     : '%s'\n", $outfile);
	printf("  Video    : [%s]\n", $vid_codec);
	printf("  Audio    : %s\n", $aud_codec);
	if ($crf) {
		printf("  CRF      : %s\n", $crf);
	}
	printf("  Subtitle : %s\n", "*COPY*");
	print "\n";

	system(@cmd_full);
	my $exit = $? >> 8;
	print "\n";

	if ($exit != 0) {
		dd(\@cmd_full);
	}

	# See if the original/encoded file length is the same
	# This is to check if the encode was completed successfully
	my $orig_length    = get_video_length($infile)  // 330;
	my $encoded_length = get_video_length($outfile) // 0;

	# A little difference is OK. We say within 5 seconds is OK
	my $diff = abs($orig_length - $encoded_length);
	if ($diff < 5) {
		my $diff_size      = int((filesize($infile) - filesize($outfile)) / 1024 / 1024);
		$total_size       += filesize($infile);
		$total_compressed += filesize($outfile);

		if (!$keep) {
			unlink($infile);
			#rename($infile, "$infile.orig");
		}

		my $final_size = (filesize($outfile) / 1024 / 1024);
		printf("%sReencode successful:%s %s, %0.1fMB (saved %s%0.1fMB%s)\n", color("green"), color("reset"), human_time(time() - $start), $final_size, color(43), $diff_size, color('reset'));
	} elsif ($sample) {
			printf("%sInfo:%s Sample file generated in %s\n", color("green"), color("reset"), human_time($diff));
	} else {
		printf("%sError:%s Something went wrong with the encode. Output length difference: %s\n", color("red"), color("reset"), human_time($diff));
	}
}

my $count = scalar(@files);
if ($count > 1) {
	my $total_time    = human_time(time() - $script_start);
	$total_size       = color(43, human_size($total_size));
	$total_compressed = color(229, human_size($total_compressed));

	if (!$info) {
		print "\n";
		print "Compressed $count files in $total_time. $total_size compressed down to $total_compressed\n";
	}
}

###############################################################################
###############################################################################

sub filesize {
	my $file = shift();
	my $ret = -s $file;

	return $ret;
}

sub argv {
	my $ret = {};

	for (my $i = 0; $i < scalar(@ARGV); $i++) {
		# If the item starts with "-" it's a key
		if ((my ($key) = $ARGV[$i] =~ /^--?([a-zA-Z_]\w*)/) && ($ARGV[$i] !~ /^-\w\w/)) {
			# If the next item does not start with "--" it's the value for this item
			if (defined($ARGV[$i + 1]) && ($ARGV[$i + 1] !~ /^--?\D/)) {
				$ret->{$key} = $ARGV[$i + 1];
			# Bareword like --verbose with no options
			} else {
				$ret->{$key}++;
			}
		}
	}

	# We're looking for a certain item
	if ($_[0]) { return $ret->{$_[0]}; }

	return $ret;
}

sub trim {
	if (wantarray) {
		my @ret;
		foreach (@_) {
			push(@ret,scalar(trim($_)));
		}

		return @ret;
	} else {
		my $s = shift();
		if (length($s) == 0) { return ""; }
		$s =~ s/^\s*//;
		$s =~ s/\s*$//;

		return $s;
	}
}

# Debug print variable using either Data::Dump::Color (preferred) or Data::Dumper
# Creates methods k() and kd() to print, and print & die respectively
BEGIN {
	if (eval { require Data::Dump::Color }) {
		*k = sub { Data::Dump::Color::dd(@_) };
	} else {
		require Data::Dumper;
		*k = sub { print Data::Dumper::Dumper(\@_) };
	}

	sub kd {
		k(@_);

		printf("Died at %2\$s line #%3\$s\n",caller());
		exit(15);
	}
}

# String format: '115', '165_bold', '10_on_140', 'reset', 'on_173', 'red', 'white_on_blue'
sub color {
	my ($str, $txt) = @_;

	# If we're NOT connected to a an interactive terminal don't do color
	#if (-t STDOUT == 0) { return $txt // ''; }

	# No string sent in, so we just reset
	if (!length($str) || $str eq 'reset') { return "\e[0m"; }

	# Some predefined colors
	my %color_map = qw(red 160 blue 27 green 34 yellow 226 orange 214 purple 93 white 15 black 0);
	$str =~ s|([A-Za-z]+)|$color_map{$1} // $1|eg;

	# Get foreground/background and any commands
	my ($fc,$cmd) = $str =~ /^(\d{1,3})?_?(\w+)?$/g;
	my ($bc)      = $str =~ /on_(\d{1,3})$/g;

	# Some predefined commands
	my %cmd_map = qw(bold 1 italic 3 underline 4 blink 5 inverse 7);
	my $cmd_num = $cmd_map{$cmd // 0};

	my $ret = '';
	if ($cmd_num)     { $ret .= "\e[${cmd_num}m"; }
	if (defined($fc)) { $ret .= "\e[38;5;${fc}m"; }
	if (defined($bc)) { $ret .= "\e[48;5;${bc}m"; }
	if ($txt)         { $ret .= $txt . "\e[0m";   }

	return $ret;
}

sub get_video_length {
	my $file = shift();

	my $x   = get_video_info($file);
	my $ret = $x->{format}->{duration};

	return $ret;
}

sub get_video_height {
	my $file = shift();

	my $x      = get_video_info($file);
	my @vid    = find_stream($x, 'video');
	my $height = $vid[0]->{height};

	return $height;
}

sub get_video_info {
	my $file = shift();

	my $cmd = "ffprobe -v quiet -print_format json -show_format -show_streams \"$file\"";
	my $out = `$cmd`;
	my $x   = decode_json($out);

	return $x;
}

sub show_video_summary {
	my $file = shift();

	my $x = get_video_info($file);

	my $duration = human_time($x->{format}->{duration});
	my @vid      = find_stream($x, 'video');
	my @aud      = find_stream($x, 'audio');
	my @sub      = find_stream($x, 'subtitle');

	if (!@vid) {
		print color("red", "WARNING:");
		my $file_str = color('yellow', $file);
		print " Skipping $file_str because it's not video\n";
		return {};
	}

	my $ret;
	$ret->{video}    = \@vid;
	$ret->{audio}    = \@aud;
	$ret->{subtitle} = \@sub;

	my $filesize = filesize($file)          || 0;
	my $bitrate  = $x->{format}->{bit_rate} || 0;

	my $br_str = color('yellow', human_size($bitrate) . "b/s");

	print color('orange', "== INPUT ==") . "\n";
	printf("  File     : '%s'\n", color('white', basename($file)));
	printf("  Size     : %s (%s)\n", human_size($filesize), $br_str);
	printf("  Length   : %s\n", $duration);

	foreach my $x (@vid) {
		my $pix_format = $x->{pix_fmt}  // "";
		my $bit_rate   = $x->{bit_rate} // 1024;
		$bit_rate /= 1000;

		my $bit_str = "";
		if (is_10bit($pix_format)) {
			$bit_str = "10bit";
		} else {
			$bit_str = "8bit";
		}

		$bit_str = color('87', $bit_str);

		my $res_str = get_resolution_string($x->{width}, $x->{height});

		my $br_str = color('yellow', $bit_rate . "Kb/s");

		if ($bit_rate > 2) {
			printf("  Video    : %s @ %s [%s] (%s)\n", $res_str, $br_str, color('green', $x->{codec_name}), $bit_str);
		} else {
			printf("  Video    : %s [%s] (%s)\n", $res_str, color('green', $x->{codec_name}), $bit_str);
		}
	}

	foreach my $x (@aud) {
		my $aud_chan = "??";
		my $bit_rate = $x->{bit_rate} // 0;
		$bit_rate /= 1000;

		if ($x->{channels} == 2) {
			$aud_chan = "2.0";
		} elsif($x->{channels} == 6) {
			$aud_chan = "5.1";
		} elsif ($x->{channels} == 1) {
			$aud_chan = "Mono";
		}

		#my $codec = $x->{profile} // $x->{codec_name};
		my $codec = $x->{codec_name};

		my $br_str = color('yellow', $bit_rate . "Kb/s");

		if ($bit_rate > 2) {
			printf("  Audio    : %s @ %s [%s]\n", $aud_chan, $br_str, color('green', $codec));
		} else {
			printf("  Audio    : %s [%s]\n", $aud_chan, color('green', $codec));
		}
	}

	foreach my $x (@sub) {
		my $lang = $x->{tags}->{title} || "";

		if ($lang) {
			printf("  Subtitle : [%s] (%s)\n", $x->{codec_name}, $lang);
		} else {
			printf("  Subtitle : [%s]\n", $x->{codec_name});
		}
	}

	if (!@sub) {
		#printf("  Subtitle : *NONE*\n");
		printf("  Subtitle : " . color("white", "NONE") . "\n");
	}

	return $ret;
}

sub find_stream {
	my $x    = shift();
	my $type = shift();
	my @ret  = ();

	foreach my $y (@{$x->{streams}}) {
		my $found_type = $y->{codec_type};

		if ($type eq $found_type) {
			push(@ret, $y);
		}
	}

	return @ret;
}

sub human_time {
	my $secs = shift() // 0;
	my $ret  = "";

	if (int($secs / 31536000) > 0) { $ret .= int($secs / 31536000) . " years "; }
	if (int(($secs % 31536000) / 2628000) > 0) { $ret .= int(($secs % 31536000) / 2628000) . " months "; }
	if (int(($secs % 2628000) / 86400) > 0) { $ret .= int(($secs % 2628000) / 86400) . " days "; }
	if (int(($secs %  86400) / 3600) > 0) { $ret .= int(($secs %  86400) / 3600) . " hours "; }
	if (int(($secs %  3600) / 60) > 0) { $ret .= int(($secs %  3600) / 60) . " minutes "; }
	if (int($secs %  60) > 0) { $ret .= int($secs %  60) . " seconds "; }

	$ret =~ s/\s+$//;

	return $ret;
}

sub human_size {
	my $size = shift();
	my $ret  = 0;

	if ($size > 1024**4) {
		$ret = sprintf("%.1fT",$size / 1024**4);
	} elsif ($size > 1024**3) {
		$ret = sprintf("%.1fG",$size / 1024**3);
	} elsif ($size > 1024**2) {
		$ret = sprintf("%.1fM",$size / 1024**2);
	} elsif ($size > 1024) {
		$ret = sprintf("%.1fK",$size / 1024);
	} elsif ($size > 0) {
		$ret = sprintf("%dB",$size);
	}

	#k("HS: $size/$ret");

	return $ret;
}

sub is_10bit {
	my $pix_format = shift();

	if ($pix_format eq "yuv420p10le") {
		return 1;
	} else {
		return 0;
	}
}

sub get_resolution_string {
	my ($width, $height) = @_;

	my $ret = "";

	if ($width == 1920 && ($height == 1080 || $height == 800)) {
		$ret = "1080p";
	} elsif ($width == 1280 && $height == 720) {
		$ret = "720p";
	} elsif ($width == 720 && $height == 480) {
		$ret = "480p";
	} else {
		$ret = $width . "x" . $height;
	}

	#k($width, $height, $ret);

	return $ret;
}

sub usage {
	return "$0 filename.mp4 [--keep] [--720p] [--sample]";
}

sub sanitize {
	my $str = shift();
	my $sep = shift() // "_";

	if (!defined($str)) {
		return undef;
	}

	# Convert multiple non-word sequences to the separator
	$str =~ s/[\W_]+/$sep/g;

	# The separator is a literal character so we quotemeta it
	$sep = quotemeta($sep);
	# Remove any separators at the beginning and end
	$str =~ s/\A$sep+//;
	$str =~ s/$sep+\z//;

	return $str;
}

# vim: filetype=perl tabstop=4 shiftwidth=4 autoindent softtabstop=4