diff --git a/libavdevice/decklink_common.cpp b/libavdevice/decklink_common.cpp
index fe187cd..47de7ef 100644
--- a/libavdevice/decklink_common.cpp
+++ b/libavdevice/decklink_common.cpp
@@ -25,12 +25,7 @@ extern "C" {
 #include "libavformat/internal.h"
 }
 
-#include <DeckLinkAPIVersion.h>
 #include <DeckLinkAPI.h>
-#if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0e030000
-#include <DeckLinkAPI_v14_2_1.h>
-#endif
-
 #ifdef _WIN32
 #include <DeckLinkAPI_i.c>
 #else
@@ -517,8 +512,8 @@ int ff_decklink_list_devices(AVFormatContext *avctx,
         return AVERROR(EIO);
 
     while (ret == 0 && iter->Next(&dl) == S_OK) {
-        IDeckLinkOutput_v14_2_1 *output_config;
-        IDeckLinkInput_v14_2_1 *input_config;
+        IDeckLinkOutput *output_config;
+        IDeckLinkInput *input_config;
         const char *display_name = NULL;
         const char *unique_name = NULL;
         AVDeviceInfo *new_device = NULL;
@@ -532,14 +527,14 @@ int ff_decklink_list_devices(AVFormatContext *avctx,
             goto next;
 
         if (show_outputs) {
-            if (dl->QueryInterface(IID_IDeckLinkOutput_v14_2_1, (void **)&output_config) == S_OK) {
+            if (dl->QueryInterface(IID_IDeckLinkOutput, (void **)&output_config) == S_OK) {
                 output_config->Release();
                 add = 1;
             }
         }
 
         if (show_inputs) {
-            if (dl->QueryInterface(IID_IDeckLinkInput_v14_2_1, (void **)&input_config) == S_OK) {
+            if (dl->QueryInterface(IID_IDeckLinkInput, (void **)&input_config) == S_OK) {
                 input_config->Release();
                 add = 1;
             }
diff --git a/libavdevice/decklink_common.h b/libavdevice/decklink_common.h
index 095b438..6b32dc2 100644
--- a/libavdevice/decklink_common.h
+++ b/libavdevice/decklink_common.h
@@ -29,23 +29,6 @@
 #define IDeckLinkProfileAttributes IDeckLinkAttributes
 #endif
 
-#if BLACKMAGIC_DECKLINK_API_VERSION < 0x0e030000
-#define IDeckLinkInput_v14_2_1 IDeckLinkInput
-#define IDeckLinkInputCallback_v14_2_1 IDeckLinkInputCallback
-#define IDeckLinkMemoryAllocator_v14_2_1 IDeckLinkMemoryAllocator
-#define IDeckLinkOutput_v14_2_1 IDeckLinkOutput
-#define IDeckLinkVideoFrame_v14_2_1 IDeckLinkVideoFrame
-#define IDeckLinkVideoInputFrame_v14_2_1 IDeckLinkVideoInputFrame
-#define IDeckLinkVideoOutputCallback_v14_2_1 IDeckLinkVideoOutputCallback
-#define IID_IDeckLinkInput_v14_2_1 IID_IDeckLinkInput
-#define IID_IDeckLinkInputCallback_v14_2_1 IID_IDeckLinkInputCallback
-#define IID_IDeckLinkMemoryAllocator_v14_2_1 IID_IDeckLinkMemoryAllocator
-#define IID_IDeckLinkOutput_v14_2_1 IID_IDeckLinkOutput
-#define IID_IDeckLinkVideoFrame_v14_2_1 IID_IDeckLinkVideoFrame
-#define IID_IDeckLinkVideoInputFrame_v14_2_1 IID_IDeckLinkVideoInputFrame
-#define IID_IDeckLinkVideoOutputCallback_v14_2_1 IID_IDeckLinkVideoOutputCallback
-#endif
-
 extern "C" {
 #include "libavutil/mem.h"
 #include "libavcodec/packet_internal.h"
@@ -93,16 +76,6 @@ static char *dup_cfstring_to_utf8(CFStringRef w)
 #define DECKLINK_FREE(s) free((void *) s)
 #endif
 
-#ifdef _WIN32
-#include <guiddef.h>    // REFIID, IsEqualIID()
-#define DECKLINK_IsEqualIID IsEqualIID
-#else
-static inline bool DECKLINK_IsEqualIID(const REFIID& riid1, const REFIID& riid2)
-{
-    return memcmp(&riid1, &riid2, sizeof(REFIID)) == 0;
-}
-#endif
-
 class decklink_output_callback;
 class decklink_input_callback;
 
@@ -120,8 +93,8 @@ typedef struct DecklinkPacketQueue {
 struct decklink_ctx {
     /* DeckLink SDK interfaces */
     IDeckLink *dl;
-    IDeckLinkOutput_v14_2_1 *dlo;
-    IDeckLinkInput_v14_2_1 *dli;
+    IDeckLinkOutput *dlo;
+    IDeckLinkInput *dli;
     IDeckLinkConfiguration *cfg;
     IDeckLinkProfileAttributes *attr;
     decklink_output_callback *output_callback;
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index 8830779..418701e 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -31,11 +31,7 @@ extern "C" {
 #include "libavformat/internal.h"
 }
 
-#include <DeckLinkAPIVersion.h>
 #include <DeckLinkAPI.h>
-#if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0e030000
-#include <DeckLinkAPI_v14_2_1.h>
-#endif
 
 extern "C" {
 #include "config.h"
@@ -109,7 +105,7 @@ static VANCLineNumber vanc_line_numbers[] = {
     {bmdModeUnknown, 0, -1, -1, -1}
 };
 
-class decklink_allocator : public IDeckLinkMemoryAllocator_v14_2_1
+class decklink_allocator : public IDeckLinkMemoryAllocator
 {
 public:
         decklink_allocator(): _refs(1) { }
@@ -133,21 +129,7 @@ public:
         virtual HRESULT STDMETHODCALLTYPE Decommit() { return S_OK; }
 
         // IUnknown methods
-        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, LPVOID *ppv)
-        {
-            if (DECKLINK_IsEqualIID(riid, IID_IUnknown)) {
-                *ppv = static_cast<IUnknown*>(this);
-            } else if (DECKLINK_IsEqualIID(riid, IID_IDeckLinkMemoryAllocator_v14_2_1)) {
-                *ppv = static_cast<IDeckLinkMemoryAllocator_v14_2_1*>(this);
-            } else {
-                *ppv = NULL;
-                return E_NOINTERFACE;
-            }
-
-            AddRef();
-            return S_OK;
-        }
-
+        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
         virtual ULONG   STDMETHODCALLTYPE AddRef(void) { return ++_refs; }
         virtual ULONG   STDMETHODCALLTYPE Release(void)
         {
@@ -490,7 +472,7 @@ skip_packet:
 }
 
 
-static void handle_klv(AVFormatContext *avctx, decklink_ctx *ctx, IDeckLinkVideoInputFrame_v14_2_1 *videoFrame, int64_t pts)
+static void handle_klv(AVFormatContext *avctx, decklink_ctx *ctx, IDeckLinkVideoInputFrame *videoFrame, int64_t pts)
 {
     const uint8_t KLV_DID = 0x44;
     const uint8_t KLV_IN_VANC_SDID = 0x04;
@@ -592,30 +574,17 @@ static void handle_klv(AVFormatContext *avctx, decklink_ctx *ctx, IDeckLinkVideo
     }
 }
 
-class decklink_input_callback : public IDeckLinkInputCallback_v14_2_1
+class decklink_input_callback : public IDeckLinkInputCallback
 {
 public:
         explicit decklink_input_callback(AVFormatContext *_avctx);
         ~decklink_input_callback();
 
-        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, LPVOID *ppv)
-        {
-            if (DECKLINK_IsEqualIID(riid, IID_IUnknown)) {
-                *ppv = static_cast<IUnknown*>(this);
-            } else if (DECKLINK_IsEqualIID(riid, IID_IDeckLinkInputCallback_v14_2_1)) {
-                *ppv = static_cast<IDeckLinkInputCallback_v14_2_1*>(this);
-            } else {
-                *ppv = NULL;
-                return E_NOINTERFACE;
-            }
-
-            AddRef();
-            return S_OK;
-        }
+        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
         virtual ULONG STDMETHODCALLTYPE AddRef(void);
         virtual ULONG STDMETHODCALLTYPE  Release(void);
         virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents, IDeckLinkDisplayMode*, BMDDetectedVideoInputFormatFlags);
-        virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame_v14_2_1*, IDeckLinkAudioInputPacket*);
+        virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame*, IDeckLinkAudioInputPacket*);
 
 private:
         std::atomic<int>  _refs;
@@ -624,7 +593,7 @@ private:
         int no_video;
         int64_t initial_video_pts;
         int64_t initial_audio_pts;
-        IDeckLinkVideoInputFrame_v14_2_1* last_video_frame;
+        IDeckLinkVideoInputFrame* last_video_frame;
 };
 
 decklink_input_callback::decklink_input_callback(AVFormatContext *_avctx) : _refs(1)
@@ -656,7 +625,7 @@ ULONG decklink_input_callback::Release(void)
     return ret;
 }
 
-static int64_t get_pkt_pts(IDeckLinkVideoInputFrame_v14_2_1 *videoFrame,
+static int64_t get_pkt_pts(IDeckLinkVideoInputFrame *videoFrame,
                            IDeckLinkAudioInputPacket *audioFrame,
                            int64_t wallclock,
                            int64_t abs_wallclock,
@@ -710,7 +679,7 @@ static int64_t get_pkt_pts(IDeckLinkVideoInputFrame_v14_2_1 *videoFrame,
     return pts;
 }
 
-static int get_bmd_timecode(AVFormatContext *avctx, AVTimecode *tc, AVRational frame_rate, BMDTimecodeFormat tc_format, IDeckLinkVideoInputFrame_v14_2_1 *videoFrame)
+static int get_bmd_timecode(AVFormatContext *avctx, AVTimecode *tc, AVRational frame_rate, BMDTimecodeFormat tc_format, IDeckLinkVideoInputFrame *videoFrame)
 {
     IDeckLinkTimecode *timecode;
     int ret = AVERROR(ENOENT);
@@ -732,7 +701,7 @@ static int get_bmd_timecode(AVFormatContext *avctx, AVTimecode *tc, AVRational f
     return ret;
 }
 
-static int get_frame_timecode(AVFormatContext *avctx, decklink_ctx *ctx, AVTimecode *tc, IDeckLinkVideoInputFrame_v14_2_1 *videoFrame)
+static int get_frame_timecode(AVFormatContext *avctx, decklink_ctx *ctx, AVTimecode *tc, IDeckLinkVideoInputFrame *videoFrame)
 {
     AVRational frame_rate = ctx->video_st->r_frame_rate;
     int ret;
@@ -757,7 +726,7 @@ static int get_frame_timecode(AVFormatContext *avctx, decklink_ctx *ctx, AVTimec
 }
 
 HRESULT decklink_input_callback::VideoInputFrameArrived(
-    IDeckLinkVideoInputFrame_v14_2_1 *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
+    IDeckLinkVideoInputFrame *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
 {
     void *frameBytes;
     void *audioFrameBytes;
@@ -1172,7 +1141,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         goto error;
 
     /* Get input device. */
-    if (ctx->dl->QueryInterface(IID_IDeckLinkInput_v14_2_1, (void **) &ctx->dli) != S_OK) {
+    if (ctx->dl->QueryInterface(IID_IDeckLinkInput, (void **) &ctx->dli) != S_OK) {
         av_log(avctx, AV_LOG_ERROR, "Could not open input device from '%s'\n",
                avctx->url);
         ret = AVERROR(EIO);
diff --git a/libavdevice/decklink_enc.cpp b/libavdevice/decklink_enc.cpp
index d2e246c..cb8f917 100644
--- a/libavdevice/decklink_enc.cpp
+++ b/libavdevice/decklink_enc.cpp
@@ -28,11 +28,7 @@ extern "C" {
 #include "libavformat/internal.h"
 }
 
-#include <DeckLinkAPIVersion.h>
 #include <DeckLinkAPI.h>
-#if BLACKMAGIC_DECKLINK_API_VERSION >= 0x0e030000
-#include <DeckLinkAPI_v14_2_1.h>
-#endif
 
 extern "C" {
 #include "libavformat/avformat.h"
@@ -52,7 +48,7 @@ extern "C" {
 #endif
 
 /* DeckLink callback class declaration */
-class decklink_frame : public IDeckLinkVideoFrame_v14_2_1
+class decklink_frame : public IDeckLinkVideoFrame
 {
 public:
     decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe, AVCodecID codec_id, int height, int width) :
@@ -115,20 +111,7 @@ public:
         _ancillary->AddRef();
         return S_OK;
     }
-    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, LPVOID *ppv)
-    {
-        if (DECKLINK_IsEqualIID(riid, IID_IUnknown)) {
-            *ppv = static_cast<IUnknown*>(this);
-        } else if (DECKLINK_IsEqualIID(riid, IID_IDeckLinkVideoFrame_v14_2_1)) {
-            *ppv = static_cast<IDeckLinkVideoFrame_v14_2_1*>(this);
-        } else {
-            *ppv = NULL;
-            return E_NOINTERFACE;
-        }
-
-        AddRef();
-        return S_OK;
-    }
+    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
     virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return ++_refs; }
     virtual ULONG   STDMETHODCALLTYPE Release(void)
     {
@@ -155,10 +138,10 @@ private:
     std::atomic<int>  _refs;
 };
 
-class decklink_output_callback : public IDeckLinkVideoOutputCallback_v14_2_1
+class decklink_output_callback : public IDeckLinkVideoOutputCallback
 {
 public:
-    virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame_v14_2_1 *_frame, BMDOutputFrameCompletionResult result)
+    virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame *_frame, BMDOutputFrameCompletionResult result)
     {
         decklink_frame *frame = static_cast<decklink_frame *>(_frame);
         struct decklink_ctx *ctx = frame->_ctx;
@@ -176,20 +159,7 @@ public:
         return S_OK;
     }
     virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped(void)       { return S_OK; }
-    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, LPVOID *ppv)
-    {
-        if (DECKLINK_IsEqualIID(riid, IID_IUnknown)) {
-            *ppv = static_cast<IUnknown*>(this);
-        } else if (DECKLINK_IsEqualIID(riid, IID_IDeckLinkVideoOutputCallback_v14_2_1)) {
-            *ppv = static_cast<IDeckLinkVideoOutputCallback_v14_2_1*>(this);
-        } else {
-            *ppv = NULL;
-            return E_NOINTERFACE;
-        }
-
-        AddRef();
-        return S_OK;
-    }
+    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
     virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return 1; }
     virtual ULONG   STDMETHODCALLTYPE Release(void)                           { return 1; }
 };
@@ -769,7 +739,7 @@ static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt)
         ctx->first_pts = pkt->pts;
 
     /* Schedule frame for playback. */
-    hr = ctx->dlo->ScheduleVideoFrame(frame,
+    hr = ctx->dlo->ScheduleVideoFrame((class IDeckLinkVideoFrame *) frame,
                                       pkt->pts * ctx->bmd_tb_num,
                                       ctx->bmd_tb_num, ctx->bmd_tb_den);
     /* Pass ownership to DeckLink, or release on failure */
@@ -904,7 +874,7 @@ av_cold int ff_decklink_write_header(AVFormatContext *avctx)
         return ret;
 
     /* Get output device. */
-    if (ctx->dl->QueryInterface(IID_IDeckLinkOutput_v14_2_1, (void **) &ctx->dlo) != S_OK) {
+    if (ctx->dl->QueryInterface(IID_IDeckLinkOutput, (void **) &ctx->dlo) != S_OK) {
         av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",
                avctx->url);
         ret = AVERROR(EIO);
