diff --git a/src/buffer.c b/src/buffer.c
index 2a65b07..1820db7 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -72,10 +72,12 @@ VAStatus sunxi_cedrus_CreateBuffer(VADriverContextP ctx, VAContextID context,
 		return VA_STATUS_ERROR_ALLOCATION_FAILED;
 
 	obj_buffer->buffer_data = NULL;
+	obj_buffer->buffer_map = NULL;
 	obj_buffer->type = type;
 	obj_buffer->max_num_elements = num_elements;
 	obj_buffer->num_elements = num_elements;
 	obj_buffer->size = size;
+	obj_buffer->map_size = 0;
 
 	if(obj_buffer->type == VASliceDataBufferType) {
 		object_context_p obj_context;
@@ -93,13 +95,19 @@ VAStatus sunxi_cedrus_CreateBuffer(VADriverContextP ctx, VAContextID context,
 
 		assert(ioctl(driver_data->mem2mem_fd, VIDIOC_QUERYBUF, &buf)==0);
 
-		obj_buffer->buffer_data = mmap(NULL, size * num_elements,
+		obj_buffer->map_size = driver_data->slice_offset[buf.index] + size * num_elements;
+		obj_buffer->buffer_map = mmap(NULL, obj_buffer->map_size,
 				PROT_READ | PROT_WRITE, MAP_SHARED,
 				driver_data->mem2mem_fd, buf.m.planes[0].m.mem_offset);
-	} else
-		obj_buffer->buffer_data = realloc(obj_buffer->buffer_data, size * num_elements);
 
-	if (obj_buffer->buffer_data == NULL)
+		obj_buffer->buffer_data = obj_buffer->buffer_map + driver_data->slice_offset[buf.index];
+		driver_data->slice_offset[buf.index] += size * num_elements;
+	} else {
+		obj_buffer->buffer_map = NULL;
+		obj_buffer->buffer_data = malloc(size * num_elements);
+	}
+
+	if (obj_buffer->buffer_data == NULL || obj_buffer->buffer_map == MAP_FAILED)
 		return VA_STATUS_ERROR_ALLOCATION_FAILED;
 
 	if (data)
@@ -158,11 +166,12 @@ void sunxi_cedrus_destroy_buffer(struct sunxi_cedrus_driver_data *driver_data,
 		object_buffer_p obj_buffer)
 {
 	if (obj_buffer->buffer_data != NULL) {
-		if(obj_buffer->type == VASliceDataBufferType)
-			munmap(obj_buffer->buffer_data, obj_buffer->size);
-		else
+		if (obj_buffer->type != VASliceDataBufferType)
 			free(obj_buffer->buffer_data);
+		else if (obj_buffer->buffer_map != NULL && obj_buffer->map_size > 0)
+			munmap(obj_buffer->buffer_map, obj_buffer->map_size);
 
+		obj_buffer->buffer_map = NULL;
 		obj_buffer->buffer_data = NULL;
 	}
 
diff --git a/src/buffer.h b/src/buffer.h
index e39c238..82438e1 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -37,10 +37,12 @@
 struct object_buffer {
 	struct object_base base;
 	void *buffer_data;
+	void *buffer_map;
 	int max_num_elements;
 	int num_elements;
 	VABufferType type;
 	unsigned int size;
+	unsigned int map_size;
 };
 
 typedef struct object_buffer *object_buffer_p;
diff --git a/src/picture.c b/src/picture.c
index e20ae01..19dc709 100644
--- a/src/picture.c
+++ b/src/picture.c
@@ -197,7 +197,10 @@ VAStatus sunxi_cedrus_EndPicture(VADriverContextP ctx, VAContextID context)
 	switch(obj_config->profile) {
 		case VAProfileMPEG2Simple:
 		case VAProfileMPEG2Main:
-			out_buf.m.planes[0].bytesused = obj_context->mpeg2_frame_hdr.slice_len/8;
+			obj_context->mpeg2_frame_hdr.slice_pos = 0;
+			obj_context->mpeg2_frame_hdr.slice_len = driver_data->slice_offset[obj_surface->input_buf_index] * 8;
+
+			out_buf.m.planes[0].bytesused = driver_data->slice_offset[obj_surface->input_buf_index];
 			ctrl.id = V4L2_CID_MPEG_VIDEO_MPEG2_FRAME_HDR;
 			ctrl.ptr = &obj_context->mpeg2_frame_hdr;
 			ctrl.size = sizeof(obj_context->mpeg2_frame_hdr);
@@ -218,6 +221,8 @@ VAStatus sunxi_cedrus_EndPicture(VADriverContextP ctx, VAContextID context)
 			break;
 	}
 
+	driver_data->slice_offset[obj_surface->input_buf_index] = 0;
+
 	memset(&(cap_buf), 0, sizeof(cap_buf));
 	cap_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
 	cap_buf.memory = V4L2_MEMORY_MMAP;
diff --git a/src/sunxi_cedrus_drv_video.c b/src/sunxi_cedrus_drv_video.c
index 6be2b36..cc5ce20 100644
--- a/src/sunxi_cedrus_drv_video.c
+++ b/src/sunxi_cedrus_drv_video.c
@@ -185,8 +185,10 @@ VAStatus VA_DRIVER_INIT_FUNC(VADriverContextP ctx)
 	driver_data->mem2mem_fd = open("/dev/video0", O_RDWR | O_NONBLOCK, 0);
 	assert(driver_data->mem2mem_fd >= 0);
 
-	for (int i = 0; i < INPUT_BUFFERS_NB; i++)
+	for (int i = 0; i < INPUT_BUFFERS_NB; i++) {
 		driver_data->request_fds[i] = -1;
+		driver_data->slice_offset[i] = 0;
+	}
 
 	assert(ioctl(driver_data->mem2mem_fd, VIDIOC_QUERYCAP, &cap)==0);
 	if (!(cap.capabilities & V4L2_CAP_VIDEO_M2M_MPLANE))
diff --git a/src/sunxi_cedrus_drv_video.h b/src/sunxi_cedrus_drv_video.h
index 60b546b..f115bdf 100644
--- a/src/sunxi_cedrus_drv_video.h
+++ b/src/sunxi_cedrus_drv_video.h
@@ -56,6 +56,7 @@ struct sunxi_cedrus_driver_data {
 	unsigned int		num_dst_bufs;
 	int			mem2mem_fd;
 	int			request_fds[INPUT_BUFFERS_NB];
+	int			slice_offset[INPUT_BUFFERS_NB];
 };
 
 #endif /* _SUNXI_CEDRUS_DRV_VIDEO_H_ */