diff --git a/libavdevice/decklink_common.cpp b/libavdevice/decklink_common.cpp
index f17c263c4bf49ca6421b5c8dc59a7543e1d050d8..c9107c036a59c717f67abcb448e0e4e27b8f97f0 100644
--- a/libavdevice/decklink_common.cpp
+++ b/libavdevice/decklink_common.cpp
@@ -286,7 +286,6 @@ int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direct
     IDeckLinkDisplayModeIterator *itermode;
     IDeckLinkDisplayMode *mode;
     uint32_t format_code;
-    int i=0;
     HRESULT res;
 
     if (direction == DIRECTION_IN) {
@@ -307,14 +306,14 @@ int ff_decklink_list_formats(AVFormatContext *avctx, decklink_direction_t direct
             return AVERROR(EIO);
     }
 
-    av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n\tmode\tformat_code\tdescription",
+    av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n\tformat_code\tdescription",
                avctx->filename);
     while (itermode->Next(&mode) == S_OK) {
         BMDTimeValue tb_num, tb_den;
         mode->GetFrameRate(&tb_num, &tb_den);
         format_code = av_bswap32(mode->GetDisplayMode());
-        av_log(avctx, AV_LOG_INFO, "\n\t%d\t%.4s\t\t%ldx%ld at %d/%d fps",
-                ++i, (char*) &format_code, mode->GetWidth(), mode->GetHeight(),
+        av_log(avctx, AV_LOG_INFO, "\n\t%.4s\t\t%ldx%ld at %d/%d fps",
+                (char*) &format_code, mode->GetWidth(), mode->GetHeight(),
                 (int) tb_den, (int) tb_num);
         switch (mode->GetFieldDominance()) {
         case bmdLowerFieldFirst:
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index ffe65db0d074fec692b4775a813bfb718dc05b5c..8cc1bdf7c9dcc2275ebde6cb626993c56a4f0ef3 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -516,6 +516,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
     strcpy (fname, avctx->filename);
     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;
     }