1 files changed, 8 insertions, 0 deletions
diff --git a/dir-to-movie.pl b/dir-to-movie.pl
index 7bc48c5..7e74eec 100755
--- a/dir-to-movie.pl
+++ b/dir-to-movie.pl
@@ -3,6 +3,13 @@
 my $tag = $ARGV[0] or "pix2pixhd_" . time;
 $tag =~ s/\....$//;
 
+if (! -e "results/$tag") {
+  print "usage: $0 [tag]\n";
+  exit(1);
+}
+
+chdir('results/$tag');
+
 my $i = 0;
 my $ls  = `ls -1v *.png`;
 my @lines = split('\n', $ls);
@@ -28,4 +35,5 @@ system("ffmpeg",
 
 END {
   system('rm', '-rf', 'tmp');
+  chdir('../..');
 }