diff --git a/ultragrid/src/video_display/quicktime.c b/ultragrid/src/video_display/quicktime.c
index b149881d8..01e0c4ea0 100644
--- a/ultragrid/src/video_display/quicktime.c
+++ b/ultragrid/src/video_display/quicktime.c
@@ -917,7 +917,7 @@ static void get_sub_frame(void *state, int x, int y, int w, int h, struct video_
         out->src_linesize =
                 vc_getsrc_linesize(w, out->color_spec);
         out->dst_linesize =
-                vc_getsrc_linesize(w, out->color_spec);
+                w * out->dst_bpp;
 
 }
 
diff --git a/ultragrid/src/video_display/sage.c b/ultragrid/src/video_display/sage.c
index 01afc4caf..a5be47d1a 100644
--- a/ultragrid/src/video_display/sage.c
+++ b/ultragrid/src/video_display/sage.c
@@ -304,6 +304,7 @@ static void get_sub_frame(void *state, int x, int y, int w, int h, struct video_
         out->src_linesize =
                 vc_getsrc_linesize(w, out->color_spec);
         out->dst_linesize =
-                vc_getsrc_linesize(w, out->color_spec);
+                w * out->dst_bpp;
 
 }
+