1 files changed, 1 insertions, 1 deletions
diff --git a/libswscale/utils.c b/libswscale/utils.c
index 3b488ca44f..7c89a70953 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -1014,7 +1014,7 @@ int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
     c->vLumBufSize= c->vLumFilterSize;
     c->vChrBufSize= c->vChrFilterSize;
     for (i=0; i<dstH; i++) {
-        int chrI= i*c->chrDstH / dstH;
+        int chrI = (int64_t) i * c->chrDstH / dstH;
         int nextSlice= FFMAX(c->vLumFilterPos[i   ] + c->vLumFilterSize - 1,
                            ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<c->chrSrcVSubSample));