Hi!
Attached patch may fix ticket #5431.
Please review, Carl Eugen
diff --git a/libavformat/webpenc.c b/libavformat/webpenc.c
index 2e0147c..38183ff 100644
--- a/libavformat/webpenc.c
+++ b/libavformat/webpenc.c
@@ -107,7 +107,9 @@ static int flush(AVFormatContext *s, int trailer, int64_t
pts)
if (w->frame_count == 1) {
if (!trailer) {
vp8x = 1;
- flags |= 2 + 16;
+ flags |= 2;
+ if (st->codecpar->format != AV_PIX_FMT_YUV420P)
+ flags |= 16; // stream may contain transparency information
}
if (vp8x) {
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