[FFmpeg-devel] [PATCH] swscale: Force full horizontal chroma internally when the output has a odd size.

[Michael Niedermayer]

This fixes a gray line on the right side due to 1 column of pixels being skiped.
Fixes Ticket891

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
 libswscale/utils.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 7d87a13..f314fee 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -850,7 +850,14 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);
 
     // reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation
-    if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) c->chrDstHSubSample=1;
+    if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
+        if (dstW&1) {
+            av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
+            flags |= SWS_FULL_CHR_H_INT;
+            c->flags = flags;
+        } else
+            c->chrDstHSubSample = 1;
+    }
 
     // drop some chroma lines if the user wants it
     c->vChrDrop= (flags&SWS_SRC_V_CHR_DROP_MASK)>>SWS_SRC_V_CHR_DROP_SHIFT;
-- 
1.7.5.4