diff --git a/src/hal/hisi/v1_hal.c b/src/hal/hisi/v1_hal.c
index 2005109..420f8f8 100644
--- a/src/hal/hisi/v1_hal.c
+++ b/src/hal/hisi/v1_hal.c
@@ -515,7 +515,7 @@ int v1_video_create(char index, hal_vidconfig *config)
     attrib->profile = MIN(config->profile, 1);
     attrib->byFrame = 0;
     attrib->fieldOn = 0;
-    attrib->mainStrmOn = index ? 0 : 1;
+    attrib->mainStrmOn = 1;
     attrib->priority = 0;
     attrib->fieldOrFrame = 0;
     attrib->pic.width = config->width;
diff --git a/src/hal/hisi/v1_vb.h b/src/hal/hisi/v1_vb.h
index 26118c8..1da7a76 100644
--- a/src/hal/hisi/v1_vb.h
+++ b/src/hal/hisi/v1_vb.h
@@ -50,5 +50,11 @@ inline static unsigned int v1_buffer_calculate_venc(short width, short height, v
     unsigned int bufSize = CEILING_2_POWER(width, alignWidth) *
         CEILING_2_POWER(height, alignWidth) *
         (pixFmt == V1_PIXFMT_YUV422SP ? 2 : 1.5);
-    return bufSize;
+    unsigned int headSize = 16 * height;
+    if (pixFmt == V1_PIXFMT_YUV422SP)
+        headSize *= 2;
+    else if (pixFmt == V1_PIXFMT_YUV420SP)
+        headSize *= 3;
+        headSize >>= 1;
+    return bufSize + headSize;
 }
\ No newline at end of file