diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index 8b57e0cd08..0d652bc8db 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -431,7 +431,6 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
 {
     struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
     struct decklink_ctx *ctx;
-    IDeckLinkDisplayModeIterator *itermode;
     IDeckLinkIterator *iter;
     IDeckLink *dl = NULL;
     AVStream *st;
@@ -520,12 +519,6 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         return AVERROR_EXIT;
     }
 
-    if (ctx->dli->GetDisplayModeIterator(&itermode) != S_OK) {
-        av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
-        ctx->dl->Release();
-        return AVERROR(EIO);
-    }
-
     if (mode_num > 0) {
         if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
             av_log(avctx, AV_LOG_ERROR, "Could not set mode %d for %s\n", mode_num, fname);
@@ -533,8 +526,6 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         }
     }
 
-    itermode->Release();
-
     /* Setup streams. */
     st = avformat_new_stream(avctx, NULL);
     if (!st) {
diff --git a/libavdevice/decklink_enc.cpp b/libavdevice/decklink_enc.cpp
index 4d00a537ec..3f4b22cdbf 100644
--- a/libavdevice/decklink_enc.cpp
+++ b/libavdevice/decklink_enc.cpp
@@ -312,7 +312,6 @@ av_cold int ff_decklink_write_header(AVFormatContext *avctx)
 {
     struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
     struct decklink_ctx *ctx;
-    IDeckLinkDisplayModeIterator *itermode;
     IDeckLinkIterator *iter;
     IDeckLink *dl = NULL;
     unsigned int n;
@@ -371,12 +370,6 @@ av_cold int ff_decklink_write_header(AVFormatContext *avctx)
         return AVERROR_EXIT;
     }
 
-    if (ctx->dlo->GetDisplayModeIterator(&itermode) != S_OK) {
-        av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
-        ctx->dl->Release();
-        return AVERROR(EIO);
-    }
-
     /* Setup streams. */
     for (n = 0; n < avctx->nb_streams; n++) {
         AVStream *st = avctx->streams[n];
@@ -392,7 +385,6 @@ av_cold int ff_decklink_write_header(AVFormatContext *avctx)
             goto error;
         }
     }
-    itermode->Release();
 
     return 0;