diff --git a/src/hal/hisi/v4_hal.c b/src/hal/hisi/v4_hal.c
index 7198a4c..85f194c 100644
--- a/src/hal/hisi/v4_hal.c
+++ b/src/hal/hisi/v4_hal.c
@@ -140,6 +140,23 @@ int v4_channel_create(char index, char mirror, char flip, char framerate)
     return EXIT_SUCCESS;
 }
 
+int v4_channel_grayscale(char enable)
+{
+    int ret;
+
+    for (char i = 0; i < V4_VENC_CHN_NUM; i++) {
+        v4_venc_para param;
+        if (!v4_state[i].enable) continue;
+        if (ret = v4_venc.fnGetChannelParam(i, &param))
+            return ret;
+        param.grayscaleOn = enable;
+        if (ret = v4_venc.fnSetChannelParam(i, &param))
+            return ret;
+    }
+
+    return EXIT_SUCCESS;
+}
+
 int v4_channel_unbind(char index)
 {
     int ret;
diff --git a/src/hal/hisi/v4_hal.h b/src/hal/hisi/v4_hal.h
index 0238e79..b9fa6f3 100644
--- a/src/hal/hisi/v4_hal.h
+++ b/src/hal/hisi/v4_hal.h
@@ -30,6 +30,7 @@ int v4_audio_init(void);
 
 int v4_channel_bind(char index);
 int v4_channel_create(char index, char mirror, char flip, char framerate);
+int v4_channel_grayscale(char enable);
 int v4_channel_unbind(char index);
 
 void *v4_image_thread(void);
diff --git a/src/hal/hisi/v4_venc.h b/src/hal/hisi/v4_venc.h
index ec24e53..0d4ec10 100644
--- a/src/hal/hisi/v4_venc.h
+++ b/src/hal/hisi/v4_venc.h
@@ -260,6 +260,17 @@ typedef struct {
     v4_venc_packinfo packetInfo[8];
 } v4_venc_pack;
 
+typedef struct {
+    int grayscaleOn;
+    unsigned int prio;
+    unsigned int maxStrmCnt;
+    unsigned int wakeFrmCnt;
+    int cropOn;
+    v4_common_rect crop;
+    int srcFps;
+    int dstFps;
+} v4_venc_para;
+
 typedef struct {
     unsigned int leftPics;
     unsigned int leftBytes;
@@ -363,9 +374,11 @@ typedef struct {
 
     int (*fnCreateChannel)(int channel, v4_venc_chn *config);
     int (*fnGetChannelConfig)(int channel, v4_venc_chn *config);
+    int (*fnGetChannelParam)(int channel, v4_venc_para *config);
     int (*fnDestroyChannel)(int channel);
     int (*fnResetChannel)(int channel);
     int (*fnSetChannelConfig)(int channel, v4_venc_chn *config);
+    int (*fnSetChannelParam)(int channel, v4_venc_para *config);
     int (*fnSetColorToGray)(int channel, int *active);
 
     int (*fnFreeDescriptor)(int channel);
@@ -410,6 +423,12 @@ static int v4_venc_load(v4_venc_impl *venc_lib) {
         return EXIT_FAILURE;
     }
 
+    if (!(venc_lib->fnGetChannelParam = (int(*)(int channel, v4_venc_para *config))
+        dlsym(venc_lib->handle, "HI_MPI_VENC_GetChnParam"))) {
+        fprintf(stderr, "[v4_venc] Failed to acquire symbol HI_MPI_VENC_GetChnParam!\n");
+        return EXIT_FAILURE;
+    }
+
     if (!(venc_lib->fnResetChannel = (int(*)(int channel))
         dlsym(venc_lib->handle, "HI_MPI_VENC_ResetChn"))) {
         fprintf(stderr, "[v4_venc] Failed to acquire symbol HI_MPI_VENC_ResetChn!\n");
@@ -422,6 +441,12 @@ static int v4_venc_load(v4_venc_impl *venc_lib) {
         return EXIT_FAILURE;
     }
 
+    if (!(venc_lib->fnSetChannelParam = (int(*)(int channel, v4_venc_para *config))
+        dlsym(venc_lib->handle, "HI_MPI_VENC_SetChnParam"))) {
+        fprintf(stderr, "[v4_venc] Failed to acquire symbol HI_MPI_VENC_SetChnParam!\n");
+        return EXIT_FAILURE;
+    }
+
     if (!(venc_lib->fnFreeDescriptor = (int(*)(int channel))
         dlsym(venc_lib->handle, "HI_MPI_VENC_CloseFd"))) {
         fprintf(stderr, "[v4_venc] Failed to acquire symbol HI_MPI_VENC_CloseFd!\n");
diff --git a/src/hal/sstar/i6_hal.c b/src/hal/sstar/i6_hal.c
index 113800b..ee94550 100644
--- a/src/hal/sstar/i6_hal.c
+++ b/src/hal/sstar/i6_hal.c
@@ -571,7 +571,7 @@ int i6_video_destroy_all(void)
     return EXIT_SUCCESS;
 }
 
-int i6_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdata *jpeg)
+int i6_video_snapshot_grab(char index, char quality, hal_jpegdata *jpeg)
 {
     int ret;
 
@@ -596,8 +596,6 @@ int i6_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdat
         goto abort;
     }
 
-    i6_channel_grayscale(grayscale);
-
     unsigned int count = 1;
     if (i6_venc.fnStartReceivingEx(index, &count)) {
         fprintf(stderr, "[i6_venc] Requesting one frame "
diff --git a/src/hal/sstar/i6_hal.h b/src/hal/sstar/i6_hal.h
index d6fef98..89257ae 100644
--- a/src/hal/sstar/i6_hal.h
+++ b/src/hal/sstar/i6_hal.h
@@ -39,7 +39,7 @@ int i6_region_setbitmap(int handle, hal_bitmap *bitmap);
 int i6_video_create(char index, hal_vidconfig *config);
 int i6_video_destroy(char index);
 int i6_video_destroy_all(void);
-int i6_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdata *jpeg);
+int i6_video_snapshot_grab(char index, char quality, hal_jpegdata *jpeg);
 void *i6_video_thread(void);
 
 void i6_system_deinit(void);
diff --git a/src/hal/sstar/i6c_hal.c b/src/hal/sstar/i6c_hal.c
index f4c07ad..bb6d0da 100644
--- a/src/hal/sstar/i6c_hal.c
+++ b/src/hal/sstar/i6c_hal.c
@@ -676,7 +676,7 @@ int i6c_video_destroy_all(void)
     return EXIT_SUCCESS;
 }
 
-int i6c_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdata *jpeg)
+int i6c_video_snapshot_grab(char index, char quality, hal_jpegdata *jpeg)
 {
     int ret;
     char device = 
@@ -705,8 +705,6 @@ int i6c_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegda
         goto abort;
     }
 
-    i6c_channel_grayscale(grayscale);
-
     unsigned int count = 1;
     if (i6c_venc.fnStartReceivingEx(device, index, &count)) {
         fprintf(stderr, "[i6c_venc] Requesting one frame "
diff --git a/src/hal/sstar/i6c_hal.h b/src/hal/sstar/i6c_hal.h
index 28be876..6a51548 100644
--- a/src/hal/sstar/i6c_hal.h
+++ b/src/hal/sstar/i6c_hal.h
@@ -39,7 +39,7 @@ int i6c_region_setbitmap(int handle, hal_bitmap *bitmap);
 int i6c_video_create(char index, hal_vidconfig *config);
 int i6c_video_destroy(char index, char jpeg);
 int i6c_video_destroy_all(void);
-int i6c_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdata *jpeg);
+int i6c_video_snapshot_grab(char index, char quality, hal_jpegdata *jpeg);
 void *i6c_video_thread(void);
 
 void i6c_system_deinit(void);
diff --git a/src/hal/sstar/i6f_hal.c b/src/hal/sstar/i6f_hal.c
index e1c95de..b3526fc 100644
--- a/src/hal/sstar/i6f_hal.c
+++ b/src/hal/sstar/i6f_hal.c
@@ -633,7 +633,7 @@ int i6f_video_destroy_all(void)
     return EXIT_SUCCESS;
 }
 
-int i6f_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdata *jpeg)
+int i6f_video_snapshot_grab(char index, char quality, hal_jpegdata *jpeg)
 {
     int ret;
     char device = 
@@ -664,8 +664,6 @@ int i6f_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegda
         goto abort;
     }
 
-    i6f_channel_grayscale(grayscale);
-
     unsigned int count = 1;
     if (i6f_venc.fnStartReceivingEx(device, index, &count)) {
         fprintf(stderr, "[i6f_venc] Requesting one frame "
diff --git a/src/hal/sstar/i6f_hal.h b/src/hal/sstar/i6f_hal.h
index 483ef88..4d53d38 100644
--- a/src/hal/sstar/i6f_hal.h
+++ b/src/hal/sstar/i6f_hal.h
@@ -37,7 +37,7 @@ int i6f_region_setbitmap(int handle, hal_bitmap *bitmap);
 int i6f_video_create(char index, hal_vidconfig *config);
 int i6f_video_destroy(char index, char jpeg);
 int i6f_video_destroy_all(void);
-int i6f_video_snapshot_grab(char index, char quality, char grayscale, hal_jpegdata *jpeg);
+int i6f_video_snapshot_grab(char index, char quality, hal_jpegdata *jpeg);
 void *i6f_video_thread(void);
 
 void i6f_system_deinit(void);
diff --git a/src/jpeg.c b/src/jpeg.c
index cce217d..f4d6895 100644
--- a/src/jpeg.c
+++ b/src/jpeg.c
@@ -114,12 +114,9 @@ int jpeg_get(short width, short height, char quality, char grayscale,
     int ret;
 
     switch (plat) {
-        case HAL_PLATFORM_I6:  ret = i6_video_snapshot_grab(jpeg_index, quality,
-            grayscale, jpeg); break;
-        case HAL_PLATFORM_I6C: ret = i6c_video_snapshot_grab(jpeg_index, quality,
-            grayscale, jpeg); break;
-        case HAL_PLATFORM_I6F: ret = i6f_video_snapshot_grab(jpeg_index, quality,
-            grayscale, jpeg); break;
+        case HAL_PLATFORM_I6:  ret = i6_video_snapshot_grab(jpeg_index, quality, jpeg); break;
+        case HAL_PLATFORM_I6C: ret = i6c_video_snapshot_grab(jpeg_index, quality, jpeg); break;
+        case HAL_PLATFORM_I6F: ret = i6f_video_snapshot_grab(jpeg_index, quality, jpeg); break;
         case HAL_PLATFORM_V3:  ret = v3_video_snapshot_grab(jpeg_index, jpeg); break;
         case HAL_PLATFORM_V4:  ret = v4_video_snapshot_grab(jpeg_index, jpeg); break;
         case HAL_PLATFORM_T31: ret = t31_video_snapshot_grab(app_config.mjpeg_enable ? 
diff --git a/src/video.c b/src/video.c
index 0475f39..88566ec 100644
--- a/src/video.c
+++ b/src/video.c
@@ -103,6 +103,7 @@ void set_grayscale(bool active) {
         case HAL_PLATFORM_I6C: i6c_channel_grayscale(active); break;
         case HAL_PLATFORM_I6F: i6f_channel_grayscale(active); break;
         case HAL_PLATFORM_V3:  v3_channel_grayscale(active); break;
+        case HAL_PLATFORM_V4:  v4_channel_grayscale(active); break;
         case HAL_PLATFORM_T31: t31_channel_grayscale(active); break;
     }
     pthread_mutex_unlock(&mutex);