make animate script work for modern luas

diff --git a/animate.lua b/animate.lua
index 616c717f4eb51ff396a343b5a2759ef90faf35d8..ae3ff24e464dd4dd6cf3c9b12f0106dbd91a07b3 100755 (executable)
--- a/animate.lua
+++ b/animate.lua
@@ -109,7 +109,7 @@ X
         i = coroutine.yield()
         out:close()
         if 1 < supersample and
-                run("convert %s -scale %dx%d %s", filename, size.w, size.h, filename) ~= 0 then
+                not run("convert %s -scale %dx%d %s", filename, size.w, size.h, filename) then
             print()
             os.exit(1)
         end
@@ -140,7 +140,7 @@ for render,frame in renderings() do render(frame) end
 
 print()
 
-if run("ffmpeg -i frames/anim%%04d.bmp %s -y -an scene.avi", ffmpeg_opts) == 0 then
+if run("ffmpeg -i frames/anim%%04d.bmp %s -y -an scene.avi", ffmpeg_opts) then
     print("Animation written to scene.avi.")
 else
     print("The animation could not be created. Is ffmpeg installed?")