Hi everybody,
i try to generate an MPEG that is suitable for a background menu for a DVD.
So i used a Perl script to generate some pictures:
#! /usr/bin/perl -w
use GD;
my $n = 25;
for(my $i = 0; $i < $n; $i++) {
my $img = GD::Image->new(720, 576);
my $white = $img->colorAllocate(255, 255, 255);
my $black = $img->colorAllocate(0, 0, 0);
# $img->transparent($white);
$img->rectangle(10, 10, 10+2*$i, 10+3*$i, $black);
save_png(sprintf("pic/img%02i.png", $i), $img);
}
sub save_png {
my ($fname, $im) = @_;
local *FH;
open FH, "> $fname" or die "can't write-open '$fname'\n";
binmode FH;
print FH $im->png();
close FH;
}
Then i used "mogrify *" on all the images. before that i got
some complaints from png2yuv:
png2yuv -v 2 -f 25.00 -I t -L 1 -n 24 -j pic/img%02d.png > menu.yuv
INFO: [png2yuv] Parsing & checking input files.
--DEBUG: [png2yuv] Analyzing pic/img00.png to get the right pic params
INFO: [png2yuv] Image dimensions are 720x576
INFO: [png2yuv] Movie frame rate is: 25.000000 frames/second
INFO: [png2yuv] Interlaced frames, top field first.
INFO: [png2yuv] Frame size: 720 x 576
INFO: [png2yuv] Now generating YUV4MPEG stream.
**ERROR: [png2yuv] mpegz: UNKNOWN COLOR FORMAT 3 in PNG transformation !
So after mogrifying the pictures i can create a YUV stream.
png2yuv -v 2 -f 25.00 -I t -L 1 -n 24 -j pic/img%02d.png > menu.yuv
... lots of debug stuff ...
But when i use MPlayer to show the stream i get lots of garbage output.
In the output i can see the generated pictures, but they are heavily
distorted and garbage is added.
Can anybody tell me what is going wrong?
Do i use incorrect parameters?
Best regards,
Torsten.
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