[FFmpeg-devel] [PATCH]lavf/webpenc: Do not set alpha flag for yuv420p

[Carl Eugen Hoyos]

On Tuesday 03 May 2016 03:04:50 pm Ronald S. Bultje wrote:

> > +                if (av_pix_fmt_desc_get(st->codecpar->format)->flags &&
> > AV_PIX_FMT_FLAG_ALPHA)

> I think you want s/&&/&/?

Definitely, new patch attached.

Thank you, Carl Eugen
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From 359b2b5a46d8274ac66f9c47a88e2ead25f7479c Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos at ag.or.at>
Date: Tue, 3 May 2016 17:53:40 +0200
Subject: [PATCH] lavf/webpenc: Do not set alpha flag for yuv420p.

Fixes one usecase of ticket #5431.
---
 libavformat/webpenc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/webpenc.c b/libavformat/webpenc.c
index 2e0147c..5d353cf 100644
--- a/libavformat/webpenc.c
+++ b/libavformat/webpenc.c
@@ -21,6 +21,7 @@
 
 #include "libavutil/intreadwrite.h"
 #include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
 #include "avformat.h"
 #include "internal.h"
 
@@ -107,7 +108,9 @@ 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 (av_pix_fmt_desc_get(st->codecpar->format)->flags & AV_PIX_FMT_FLAG_ALPHA)
+                    flags |= 16; // stream may contain transparency information
             }
 
             if (vp8x) {
-- 
1.7.10.4