mirror of
https://github.com/mpv-player/mpv
synced 2024-12-27 01:22:30 +00:00
76a67731fc
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13034 b3059339-0415-0410-9bf9-f77b7e298cf2
44 lines
1.4 KiB
Perl
Executable File
44 lines
1.4 KiB
Perl
Executable File
#!/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));
|
|
}
|