diff --git a/libavdevice/decklink_common.cpp b/libavdevice/decklink_common.cpp
index 659aa9be3f..04c0f99edc 100644
--- a/libavdevice/decklink_common.cpp
+++ b/libavdevice/decklink_common.cpp
@@ -200,7 +200,7 @@ int ff_decklink_set_format(AVFormatContext *avctx,
                                int width, int height,
                                int tb_num, int tb_den,
                                enum AVFieldOrder field_order,
-                               decklink_direction_t direction, int num)
+                               decklink_direction_t direction)
 {
     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
@@ -214,8 +214,8 @@ int ff_decklink_set_format(AVFormatContext *avctx,
     int i = 1;
     HRESULT res;
 
-    av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, field order %d, direction %d, mode number %d, format code %s\n",
-        width, height, tb_num, tb_den, field_order, direction, num, (cctx->format_code) ? cctx->format_code : "(unset)");
+    av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, field order %d, direction %d, format code %s\n",
+        width, height, tb_num, tb_den, field_order, direction, cctx->format_code ? cctx->format_code : "(unset)");
 
     if (direction == DIRECTION_IN) {
         res = ctx->dli->GetDisplayModeIterator (&itermode);
@@ -248,7 +248,6 @@ int ff_decklink_set_format(AVFormatContext *avctx,
              bmd_height == height &&
              !av_cmp_q(mode_tb, target_tb) &&
              field_order_eq(field_order, bmd_field_dominance))
-             || i == num
              || target_mode == bmd_mode) {
             ctx->bmd_mode   = bmd_mode;
             ctx->bmd_width  = bmd_width;
@@ -314,8 +313,8 @@ int ff_decklink_set_format(AVFormatContext *avctx,
     return -1;
 }
 
-int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction, int num) {
-    return ff_decklink_set_format(avctx, 0, 0, 0, 0, AV_FIELD_UNKNOWN, direction, num);
+int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction) {
+    return ff_decklink_set_format(avctx, 0, 0, 0, 0, AV_FIELD_UNKNOWN, direction);
 }
 
 int ff_decklink_list_devices(AVFormatContext *avctx,
diff --git a/libavdevice/decklink_common.h b/libavdevice/decklink_common.h
index 35422a300b..8b3dbce2fb 100644
--- a/libavdevice/decklink_common.h
+++ b/libavdevice/decklink_common.h
@@ -197,8 +197,8 @@ static const BMDTimecodeFormat decklink_timecode_format_map[] = {
 };
 
 int ff_decklink_set_configs(AVFormatContext *avctx, decklink_direction_t direction);
-int ff_decklink_set_format(AVFormatContext *avctx, int width, int height, int tb_num, int tb_den, enum AVFieldOrder field_order, decklink_direction_t direction = DIRECTION_OUT, int num = 0);
-int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction, int num);
+int ff_decklink_set_format(AVFormatContext *avctx, int width, int height, int tb_num, int tb_den, enum AVFieldOrder field_order, decklink_direction_t direction = DIRECTION_OUT);
+int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction);
 int ff_decklink_list_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list, int show_inputs, int show_outputs);
 void ff_decklink_list_devices_legacy(AVFormatContext *avctx, int show_inputs, int show_outputs);
 int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direction = DIRECTION_OUT);
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index ab7f28112e..19ea1eccad 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -1005,9 +1005,6 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
     class decklink_input_callback *input_callback;
     AVStream *st;
     HRESULT result;
-    char fname[1024];
-    char *tmp;
-    int mode_num = 0;
     int ret;
 
     ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
@@ -1062,15 +1059,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         cctx->raw_format = MKBETAG('v','2','1','0');
     }
 
-    av_strlcpy(fname, avctx->url, sizeof(fname));
-    tmp=strchr (fname, '@');
-    if (tmp != NULL) {
-        av_log(avctx, AV_LOG_WARNING, "The @mode syntax is deprecated and will be removed. Please use the -format_code option.\n");
-        mode_num = atoi (tmp+1);
-        *tmp = 0;
-    }
-
-    ret = ff_decklink_init_device(avctx, fname);
+    ret = ff_decklink_init_device(avctx, avctx->url);
     if (ret < 0)
         return ret;
 
@@ -1111,7 +1100,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         goto error;
     }
 
-    if (mode_num == 0 && !cctx->format_code) {
+    if (!cctx->format_code) {
         if (decklink_autodetect(cctx) < 0) {
             av_log(avctx, AV_LOG_ERROR, "Cannot Autodetect input stream or No signal\n");
             ret = AVERROR(EIO);
@@ -1119,9 +1108,9 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         }
         av_log(avctx, AV_LOG_INFO, "Autodetected the input mode\n");
     }
-    if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Could not set mode number %d or format code %s for %s\n",
-            mode_num, (cctx->format_code) ? cctx->format_code : "(unset)", fname);
+    if (ff_decklink_set_format(avctx, DIRECTION_IN) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Could not set format code %s for %s\n",
+            cctx->format_code ? cctx->format_code : "(unset)", avctx->url);
         ret = AVERROR(EIO);
         goto error;
     }