diff --git a/libavcodec/cfhdenc.c b/libavcodec/cfhdenc.c
index 42bbf99c96..5ef744c4c8 100644
--- a/libavcodec/cfhdenc.c
+++ b/libavcodec/cfhdenc.c
@@ -547,7 +547,7 @@ static int cfhd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                          width, height * 2);
     }
 
-    ret = ff_alloc_packet2(avctx, pkt, 64LL + s->planes * (2LL * avctx->width * avctx->height + 1000LL), 0);
+    ret = ff_alloc_packet2(avctx, pkt, 256LL + s->planes * (4LL * avctx->width * (avctx->height + 15) + 2048LL), 0);
     if (ret < 0)
         return ret;