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-rw-r--r--libswscale/swscale.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index b231302216..bd909bf163 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -407,9 +407,9 @@ static int swScale(SwsContext *c, const uint8_t* src[],
(CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3] + dstStride[3] * dstY : NULL,
};
- const int firstLumSrcY= vLumFilterPos[dstY]; //First line needed as input
- const int firstLumSrcY2= vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)];
- const int firstChrSrcY= vChrFilterPos[chrDstY]; //First line needed as input
+ const int firstLumSrcY= FFMAX(1 - vLumFilterSize, vLumFilterPos[dstY]); //First line needed as input
+ const int firstLumSrcY2= FFMAX(1 - vLumFilterSize, vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)]);
+ const int firstChrSrcY= FFMAX(1 - vChrFilterSize, vChrFilterPos[chrDstY]); //First line needed as input
// Last line needed as input
int lastLumSrcY = FFMIN(c->srcH, firstLumSrcY + vLumFilterSize) - 1;