diff --git a/multimedia/ffmpeg/Makefile b/multimedia/ffmpeg/Makefile
index 8e6749ed0a46..588f27e8a141 100644
--- a/multimedia/ffmpeg/Makefile
+++ b/multimedia/ffmpeg/Makefile
@@ -7,6 +7,7 @@
 
 PORTNAME=	ffmpeg
 PORTVERSION=	0.5
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	multimedia audio ipv6 net
 MASTER_SITES=	http://ffmpeg.org/releases/
diff --git a/multimedia/ffmpeg/files/patch-libavformat-sierravmd.c b/multimedia/ffmpeg/files/patch-libavformat-sierravmd.c
new file mode 100644
index 000000000000..5c5e61694f70
--- /dev/null
+++ b/multimedia/ffmpeg/files/patch-libavformat-sierravmd.c
@@ -0,0 +1,12 @@
+--- libavformat/sierravmd.c
++++ libavformat/sierravmd.c
+@@ -154,7 +154,7 @@ static int vmd_read_header(AVFormatContext *s,
+     vmd->frame_table = NULL;
+     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
+     raw_frame_table_size = vmd->frame_count * 6;
+-    if(vmd->frame_count * vmd->frames_per_block  >= UINT_MAX / sizeof(vmd_frame)){
++    if(vmd->frame_count * vmd->frames_per_block  >= (UINT_MAX - sound_buffers) / sizeof(vmd_frame)){
+         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
+         return -1;
+     }
+