~medibuntu-maintainers/mplayer/medibuntu.lucid

#!/usr/bin/perl -w

use POSIX;

sub round {

  my $v = shift;

  return floor($v + 0.5);

}

$raw_aspect = 720/576;

if (scalar(@ARGV) < 4) {

  print("Please provide a) the cropped but unscaled resolution (e.g. " .

        "716x524), b) the aspect ratio (either 4/3 or 16/9 for most DVDs), " .

        "c) the video bitrate in kbps (e.g. 800) and d) the movie's fps.\n");

  print("If your DVD is not encoded at 720x576 then change the \$raw_aspect" .

        "variable at the beginning of this script.\n");

  exit(1);

}

($unscaled_width, $unscaled_height) = split('x', $ARGV[0]);

$encoded_at = $ARGV[1];

if ($encoded_at =~ /\//) {

  my @a = split(/\//, $encoded_at);

  $encoded_at = $a[0] / $a[1];

}

$scaled_width = $unscaled_width * ($encoded_at / ($raw_aspect));

$scaled_height = $unscaled_height;

$picture_ar = $scaled_width / $scaled_height;

($bps, $fps) = @ARGV[2, 3];

printf("Prescaled picture: %dx%d, AR %.2f\n", $scaled_width, $scaled_height,

       $picture_ar);

for ($width = 720; $width >= 320; $width -= 16) {

  $height = 16 * round($width / $picture_ar / 16);

  $diff = round($width / $picture_ar - $height);

  $new_ar = $width / $height;

  $picture_ar_error = abs(100 - $picture_ar / $new_ar * 100);

  printf("${width}x${height}, diff % 3d, new AR %.2f, AR error %.2f%% " .

         "scale=%d:%d bpp: %.3f\n", $diff, $new_ar, $picture_ar_error, $width,

         $height, ($bps * 1000) / ($width * $height * $fps));

}