[Ffmpeg-devel] [PATCH] Correct 8-bit PNG output

[Kostya]

Here is trivial patch which makes FFmpeg output correct PNGs from
palettized codecs. For now produced images are 100% transparent.
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Index: png.c
===================================================================
--- png.c	(revision 6681)
+++ png.c	(working copy)
@@ -850,7 +850,7 @@
         for(i = 0; i < 256; i++) {
             v = palette[i];
             alpha = v >> 24;
-            if (alpha != 0xff)
+            if (alpha && alpha != 0xff)
                 has_alpha = 1;
             *alpha_ptr++ = alpha;
             ptr[0] = v >> 16;