diff -Nurd ffmpegthumbs-14.12.3.orig/CMakeLists.txt ffmpegthumbs-14.12.3/CMakeLists.txt
--- ffmpegthumbs-14.12.3.orig/CMakeLists.txt	2014-08-15 17:05:29.000000000 -0400
+++ ffmpegthumbs-14.12.3/CMakeLists.txt	2020-01-08 22:26:03.000000000 -0500
@@ -27,7 +27,7 @@
 
 kde4_add_plugin(ffmpegthumbs ${ffmpegthumbs_PART_SRCS})
 
-target_link_libraries(ffmpegthumbs  ${KDE4_KIO_LIBS} ${AVUTIL_LIBRARIES} ${AVFORMAT_LIBRARIES} ${AVCODEC_LIBRARIES} ${SWSCALE_LIBRARIES} )
+target_link_libraries(ffmpegthumbs  ${KDE4_KIO_LIBS} ${AVUTIL_LIBRARIES} ${AVFORMAT_LIBRARIES} ${AVCODEC_LIBRARIES} ${SWSCALE_LIBRARIES} ${AVFILTER_LIBRARIES})
 
 install(TARGETS ffmpegthumbs DESTINATION ${PLUGIN_INSTALL_DIR})
 
diff -Nurd ffmpegthumbs-14.12.3.orig/cmake/FindFFmpeg.cmake ffmpegthumbs-14.12.3/cmake/FindFFmpeg.cmake
--- ffmpegthumbs-14.12.3.orig/cmake/FindFFmpeg.cmake	2014-08-15 17:05:29.000000000 -0400
+++ ffmpegthumbs-14.12.3/cmake/FindFFmpeg.cmake	2020-01-08 22:23:47.000000000 -0500
@@ -99,6 +99,7 @@
 
   # Check for all possible component.
   find_component(AVCODEC  libavcodec  avcodec  libavcodec/avcodec.h)
+  find_component(AVFILTER libavfilter avfilter libavfilter/avfilter.h)
   find_component(AVFORMAT libavformat avformat libavformat/avformat.h)
   find_component(AVDEVICE libavdevice avdevice libavdevice/avdevice.h)
   find_component(AVUTIL   libavutil   avutil   libavutil/avutil.h)
diff -Nurd ffmpegthumbs-14.12.3.orig/ffmpegthumbnailer/moviedecoder.cpp ffmpegthumbs-14.12.3/ffmpegthumbnailer/moviedecoder.cpp
--- ffmpegthumbs-14.12.3.orig/ffmpegthumbnailer/moviedecoder.cpp	2014-08-15 17:05:29.000000000 -0400
+++ ffmpegthumbs-14.12.3/ffmpegthumbnailer/moviedecoder.cpp	2020-01-08 22:23:47.000000000 -0500
@@ -40,6 +40,10 @@
         , m_FormatContextWasGiven(pavContext != NULL)
         , m_AllowSeek(true)
         , m_initialized(false)
+        , m_bufferSinkContext(nullptr)
+        , m_bufferSourceContext(nullptr)
+        , m_filterGraph(nullptr)
+        , m_filterFrame(nullptr)
 {
     initialize(filename);
 }
@@ -51,6 +55,9 @@
 
 void MovieDecoder::initialize(const QString& filename)
 {
+    m_lastWidth = -1;
+    m_lastHeight = -1;
+    m_lastPixfmt = AV_PIX_FMT_NONE;
     av_register_all();
     avcodec_register_all();
 
@@ -67,7 +74,7 @@
     }
 
     initializeVideo();
-    m_pFrame = avcodec_alloc_frame();
+    m_pFrame = av_frame_alloc();
 
     if (m_pFrame) {
         m_initialized=true;
@@ -82,6 +89,7 @@
 
 void MovieDecoder::destroy()
 {
+    deleteFilterGraph();
     if (m_pVideoCodecContext) {
         avcodec_close(m_pVideoCodecContext);
         m_pVideoCodecContext = NULL;
@@ -93,13 +101,13 @@
     }
 
     if (m_pPacket) {
-        av_free_packet(m_pPacket);
+        av_packet_unref(m_pPacket);
         delete m_pPacket;
         m_pPacket = NULL;
     }
 
     if (m_pFrame) {
-        av_free(m_pFrame);
+        av_frame_free(&m_pFrame);
         m_pFrame = NULL;
     }
 
@@ -239,7 +247,7 @@
         return false;
     }
 
-    avcodec_get_frame_defaults(m_pFrame);
+    av_frame_unref(m_pFrame);
 
     int frameFinished = 0;
 
@@ -264,7 +272,7 @@
     int attempts = 0;
 
     if (m_pPacket) {
-        av_free_packet(m_pPacket);
+        av_packet_unref(m_pPacket);
         delete m_pPacket;
     }
 
@@ -275,7 +283,7 @@
         if (framesAvailable) {
             frameDecoded = m_pPacket->stream_index == m_VideoStream;
             if (!frameDecoded) {
-                av_free_packet(m_pPacket);
+                av_packet_unref(m_pPacket);
             }
         }
     }
@@ -283,15 +291,100 @@
     return frameDecoded;
 }
 
+void MovieDecoder::deleteFilterGraph()
+{
+    if (m_filterGraph) {
+        av_frame_free(&m_filterFrame);
+        avfilter_graph_free(&m_filterGraph);
+        m_filterGraph = nullptr;
+    }
+}
+
+bool MovieDecoder::initFilterGraph(enum AVPixelFormat pixfmt, int width, int height)
+{
+    AVFilterInOut *inputs = nullptr, *outputs = nullptr;
+
+    deleteFilterGraph();
+    m_filterGraph = avfilter_graph_alloc();
+
+    QByteArray arguments("buffer=");
+    arguments += "video_size=" + QByteArray::number(width) + "x" + QByteArray::number(height) + ":";
+    arguments += "pix_fmt=" + QByteArray::number(pixfmt) + ":";
+    arguments += "time_base=1/1:pixel_aspect=0/1[in];";
+    arguments += "[in]yadif[out];";
+    arguments += "[out]buffersink";
+
+    int ret = avfilter_graph_parse2(m_filterGraph, arguments.constData(), &inputs, &outputs);
+    if (ret < 0) {
+        qWarning() << "Unable to parse filter graph";
+        return false;
+    }
+
+    if(inputs || outputs)
+        return -1;
+
+    ret = avfilter_graph_config(m_filterGraph, nullptr);
+    if (ret < 0) {
+        qWarning() << "Unable to validate filter graph";
+        return false;
+    }
+
+    m_bufferSourceContext = avfilter_graph_get_filter(m_filterGraph, "Parsed_buffer_0");
+    m_bufferSinkContext = avfilter_graph_get_filter(m_filterGraph, "Parsed_buffersink_2");
+    if (!m_bufferSourceContext || !m_bufferSinkContext) {
+        qWarning() << "Unable to get source or sink";
+        return false;
+    }
+    m_filterFrame = av_frame_alloc();
+    m_lastWidth = width;
+    m_lastHeight = height;
+    m_lastPixfmt = pixfmt;
+
+    return true;
+}
+
+bool MovieDecoder::processFilterGraph(AVPicture *dst, const AVPicture *src,
+                                enum AVPixelFormat pixfmt, int width, int height)
+{
+    if (!m_filterGraph || width != m_lastWidth ||
+        height != m_lastHeight || pixfmt != m_lastPixfmt) {
+
+        if (!initFilterGraph(pixfmt, width, height)) {
+            return false;
+        }
+    }
+
+    memcpy(m_filterFrame->data, src->data, sizeof(src->data));
+    memcpy(m_filterFrame->linesize, src->linesize, sizeof(src->linesize));
+    m_filterFrame->width = width;
+    m_filterFrame->height = height;
+    m_filterFrame->format = pixfmt;
+
+    int ret = av_buffersrc_add_frame(m_bufferSourceContext, m_filterFrame);
+    if (ret < 0) {
+        return false;
+    }
+
+    ret = av_buffersink_get_frame(m_bufferSinkContext, m_filterFrame);
+    if (ret < 0) {
+        return false;
+    }
+
+    av_picture_copy(dst, (const AVPicture *) m_filterFrame, pixfmt, width, height);
+    av_frame_unref(m_filterFrame);
+
+    return true;
+}
+
 void MovieDecoder::getScaledVideoFrame(int scaledSize, bool maintainAspectRatio, VideoFrame& videoFrame)
 {
     if (m_pFrame->interlaced_frame) {
-        avpicture_deinterlace((AVPicture*) m_pFrame, (AVPicture*) m_pFrame, m_pVideoCodecContext->pix_fmt,
+        processFilterGraph((AVPicture*) m_pFrame, (AVPicture*) m_pFrame, m_pVideoCodecContext->pix_fmt,
                               m_pVideoCodecContext->width, m_pVideoCodecContext->height);
     }
 
     int scaledWidth, scaledHeight;
-    convertAndScaleFrame(PIX_FMT_RGB24, scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
+    convertAndScaleFrame(AV_PIX_FMT_RGB24, scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
 
     videoFrame.width = scaledWidth;
     videoFrame.height = scaledHeight;
@@ -302,7 +395,7 @@
     memcpy((&(videoFrame.frameData.front())), m_pFrame->data[0], videoFrame.lineSize * videoFrame.height);
 }
 
-void MovieDecoder::convertAndScaleFrame(PixelFormat format, int scaledSize, bool maintainAspectRatio, int& scaledWidth, int& scaledHeight)
+void MovieDecoder::convertAndScaleFrame(AVPixelFormat format, int scaledSize, bool maintainAspectRatio, int& scaledWidth, int& scaledHeight)
 {
     calculateDimensions(scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
     SwsContext* scaleContext = sws_getContext(m_pVideoCodecContext->width, m_pVideoCodecContext->height,
@@ -323,7 +416,7 @@
               convertedFrame->data, convertedFrame->linesize);
     sws_freeContext(scaleContext);
 
-    av_free(m_pFrame);
+    av_frame_free(&m_pFrame);
     av_free(m_pFrameBuffer);
 
     m_pFrame        = convertedFrame;
@@ -355,9 +448,9 @@
     }
 }
 
-void MovieDecoder::createAVFrame(AVFrame** avFrame, quint8** frameBuffer, int width, int height, PixelFormat format)
+void MovieDecoder::createAVFrame(AVFrame** avFrame, quint8** frameBuffer, int width, int height, AVPixelFormat format)
 {
-    *avFrame = avcodec_alloc_frame();
+    *avFrame = av_frame_alloc();
 
     int numBytes = avpicture_get_size(format, width, height);
     *frameBuffer = reinterpret_cast<quint8*>(av_malloc(numBytes));
diff -Nurd ffmpegthumbs-14.12.3.orig/ffmpegthumbnailer/moviedecoder.h ffmpegthumbs-14.12.3/ffmpegthumbnailer/moviedecoder.h
--- ffmpegthumbs-14.12.3.orig/ffmpegthumbnailer/moviedecoder.h	2014-08-15 17:05:29.000000000 -0400
+++ ffmpegthumbs-14.12.3/ffmpegthumbnailer/moviedecoder.h	2020-01-08 22:23:47.000000000 -0500
@@ -23,6 +23,9 @@
 extern "C" {
 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
+#include <libavfilter/avfilter.h>
+#include <libavfilter/buffersrc.h>
+#include <libavfilter/buffersink.h>
 }
 
 namespace ffmpegthumbnailer
@@ -52,10 +55,14 @@
 
     bool decodeVideoPacket();
     bool getVideoPacket();
-    void convertAndScaleFrame(PixelFormat format, int scaledSize, bool maintainAspectRatio, int& scaledWidth, int& scaledHeight);
-    void createAVFrame(AVFrame** avFrame, quint8** frameBuffer, int width, int height, PixelFormat format);
+    void convertAndScaleFrame(AVPixelFormat format, int scaledSize, bool maintainAspectRatio, int& scaledWidth, int& scaledHeight);
+    void createAVFrame(AVFrame** avFrame, quint8** frameBuffer, int width, int height, AVPixelFormat format);
     void calculateDimensions(int squareSize, bool maintainAspectRatio, int& destWidth, int& destHeight);
 
+    void deleteFilterGraph();
+    bool initFilterGraph(enum AVPixelFormat pixfmt, int width, int height);
+    bool processFilterGraph(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pixfmt, int width, int height);
+
 private:
     int                     m_VideoStream;
     AVFormatContext*        m_pFormatContext;
@@ -68,6 +75,13 @@
     bool                    m_FormatContextWasGiven;
     bool                    m_AllowSeek;
     bool                    m_initialized;
+    AVFilterContext*        m_bufferSinkContext;
+    AVFilterContext*        m_bufferSourceContext;
+    AVFilterGraph*          m_filterGraph;
+    AVFrame*                m_filterFrame;
+    int                     m_lastWidth;
+    int                     m_lastHeight;
+    enum AVPixelFormat      m_lastPixfmt;
 };
 
 }
diff -Nurd ffmpegthumbs-14.12.3.orig/ffmpegthumbnailer/videothumbnailer.h ffmpegthumbs-14.12.3/ffmpegthumbnailer/videothumbnailer.h
--- ffmpegthumbs-14.12.3.orig/ffmpegthumbnailer/videothumbnailer.h	2014-08-15 17:05:29.000000000 -0400
+++ ffmpegthumbs-14.12.3/ffmpegthumbnailer/videothumbnailer.h	2020-01-08 22:37:18.000000000 -0500
@@ -31,7 +31,7 @@
 namespace ffmpegthumbnailer
 {
 
-class VideoFrame;
+struct VideoFrame;
 class ImageWriter;
 class MovieDecoder;
 
diff -Nurd ffmpegthumbs-14.12.3.orig/tests/CMakeLists.txt ffmpegthumbs-14.12.3/tests/CMakeLists.txt
--- ffmpegthumbs-14.12.3.orig/tests/CMakeLists.txt	2014-08-15 17:05:29.000000000 -0400
+++ ffmpegthumbs-14.12.3/tests/CMakeLists.txt	2020-01-08 22:25:39.000000000 -0500
@@ -19,7 +19,7 @@
 
 kde4_add_executable(ffmpegthumbtest ${ffmpegthumbtest_SRCS} )
 
-target_link_libraries(ffmpegthumbtest ${KDE4_KDECORE_LIBS} ${KDE4_KIO_LIBS} ${AVUTIL_LIBRARIES} ${AVFORMAT_LIBRARIES} ${AVCODEC_LIBRARIES} ${SWSCALE_LIBRARIES})
+target_link_libraries(ffmpegthumbtest ${KDE4_KDECORE_LIBS} ${KDE4_KIO_LIBS} ${AVUTIL_LIBRARIES} ${AVFORMAT_LIBRARIES} ${AVCODEC_LIBRARIES} ${SWSCALE_LIBRARIES} ${AVFILTER_LIBRARIES})
 
 
 
