diff --git a/app/codec/decoder.cpp b/app/codec/decoder.cpp
index 2672e1b96..77537a079 100644
--- a/app/codec/decoder.cpp
+++ b/app/codec/decoder.cpp
@@ -57,12 +57,12 @@ void Decoder::set_stream(StreamPtr fs)
   stream_ = fs;
 }
 
-FramePtr Decoder::RetrieveVideo(const rational &/*timecode*/)
+FramePtr Decoder::RetrieveVideo(const rational &/*timecode*/, const QAtomicInt* cancelled)
 {
   return nullptr;
 }
 
-FramePtr Decoder::RetrieveAudio(const rational &/*timecode*/, const rational &/*length*/, const AudioRenderingParams &/*params*/)
+FramePtr Decoder::RetrieveAudio(const rational &/*timecode*/, const rational &/*length*/, const AudioRenderingParams &/*params*/, const QAtomicInt* cancelled)
 {
   return nullptr;
 }
@@ -93,7 +93,7 @@ QVector<DecoderPtr> ReceiveListOfAllDecoders() {
   return decoders;
 }
 
-bool Decoder::ProbeMedia(Footage *f)
+bool Decoder::ProbeMedia(Footage *f, const QAtomicInt* cancelled)
 {
   // Check for a valid filename
   if (f->filename().isEmpty()) {
@@ -116,9 +116,13 @@ bool Decoder::ProbeMedia(Footage *f)
   // Pass Footage through each Decoder's probe function
   for (int i=0;i<decoder_list.size();i++) {
 
+    if (cancelled && *cancelled) {
+      return false;
+    }
+
     DecoderPtr decoder = decoder_list.at(i);
 
-    if (decoder->Probe(f)) {
+    if (decoder->Probe(f, cancelled)) {
 
       // We found a Decoder, so we can set this media as valid
       f->set_status(Footage::kReady);
@@ -168,13 +172,13 @@ DecoderPtr Decoder::CreateFromID(const QString &id)
   return nullptr;
 }
 
-void Decoder::Conform(const AudioRenderingParams &params)
+void Decoder::Conform(const AudioRenderingParams &params, const QAtomicInt* cancelled)
 {
   Q_UNUSED(params)
   qCritical() << "Conform called on an audio decoder that does not have a handler for it:" << id();
   abort();
 }
 
-void Decoder::Index()
+void Decoder::Index(const QAtomicInt *cancelled)
 {
 }
diff --git a/app/codec/decoder.h b/app/codec/decoder.h
index 17d13c94a..e613a5c01 100644
--- a/app/codec/decoder.h
+++ b/app/codec/decoder.h
@@ -91,7 +91,7 @@ public:
    * TRUE if the Decoder was able to decode this file. FALSE if not. This function should have filled the Footage
    * object with metadata if it returns TRUE. Otherwise, the Footage object should be untouched.
    */
-  virtual bool Probe(Footage* f) = 0;
+  virtual bool Probe(Footage* f, const QAtomicInt* cancelled) = 0;
 
   /**
    * @brief Open media/allocate memory
@@ -127,7 +127,7 @@ public:
    * A FramePtr of valid data at this timecode or nullptr if there was nothing to retrieve at the provided timecode or
    * the media could not be opened.
    */
-  virtual FramePtr RetrieveVideo(const rational& timecode);
+  virtual FramePtr RetrieveVideo(const rational& timecode, const QAtomicInt* cancelled);
 
   /**
    * @brief Retrieve video frame
@@ -153,7 +153,7 @@ public:
    * A FramePtr of valid data at this timecode of the requested length or nullptr if there was nothing to retrieve at
    * the provided timecode or the media could not be opened.
    */
-  virtual FramePtr RetrieveAudio(const rational& timecode, const rational& length, const AudioRenderingParams& params);
+  virtual FramePtr RetrieveAudio(const rational& timecode, const rational& length, const AudioRenderingParams& params, const QAtomicInt* cancelled);
 
   virtual bool SupportsVideo();
   virtual bool SupportsAudio();
@@ -174,7 +174,7 @@ public:
    *
    * Used to determine which frame will be served at a given time, useful for caching.
    */
-  virtual int64_t GetTimestampFromTime(const rational& time) = 0;
+  virtual int64_t GetTimestampFromTime(const rational& time, const QAtomicInt* cancelled) = 0;
 
   /**
    * @brief Try to probe a Footage file by passing it through all available Decoders
@@ -195,7 +195,7 @@ public:
    *
    * TRUE if a Decoder was successfully able to parse and probe this file. FALSE if not.
    */
-  static bool ProbeMedia(Footage* f);
+  static bool ProbeMedia(Footage* f, const QAtomicInt *cancelled);
 
   /**
    * @brief Create a Decoder instance using a Decoder ID
@@ -217,7 +217,7 @@ public:
    * All audio decoders must override this. It's not pure since video decoders don't need to use this, but default
    * behavior will abort since it should never be called.
    */
-  virtual void Conform(const AudioRenderingParams& params);
+  virtual void Conform(const AudioRenderingParams& params, const QAtomicInt* cancelled);
 
   /**
    * @brief Create an index for this media
@@ -228,7 +228,7 @@ public:
    * Indexing is slow so it's recommended to do it in a background thread. Index() must be called while the Decoder is
    * open, and does not automatically call Open() and Close() the Decoder. The caller must call thse manually.
    */
-  virtual void Index();
+  virtual void Index(const QAtomicInt* cancelled);
 
 protected:
   bool open_;
diff --git a/app/codec/ffmpeg/ffmpegdecoder.cpp b/app/codec/ffmpeg/ffmpegdecoder.cpp
index a49ab8fa8..5b47c1970 100644
--- a/app/codec/ffmpeg/ffmpegdecoder.cpp
+++ b/app/codec/ffmpeg/ffmpegdecoder.cpp
@@ -192,7 +192,7 @@ bool FFmpegDecoder::Open()
   return true;
 }
 
-FramePtr FFmpegDecoder::RetrieveVideo(const rational &timecode)
+FramePtr FFmpegDecoder::RetrieveVideo(const rational &timecode, const QAtomicInt* cancelled)
 {
   if (!open_ && !Open()) {
     return nullptr;
@@ -203,7 +203,7 @@ FramePtr FFmpegDecoder::RetrieveVideo(const rational &timecode)
   }
 
   // Convert timecode to AVStream timebase
-  int64_t target_ts = GetTimestampFromTime(timecode);
+  int64_t target_ts = GetTimestampFromTime(timecode, cancelled);
 
   if (target_ts < 0) {
     Error(QStringLiteral("Index failed to produce a valid timestamp"));
@@ -318,7 +318,7 @@ FramePtr FFmpegDecoder::RetrieveVideo(const rational &timecode)
   return nullptr;
 }
 
-FramePtr FFmpegDecoder::RetrieveAudio(const rational &timecode, const rational &length, const AudioRenderingParams &params)
+FramePtr FFmpegDecoder::RetrieveAudio(const rational &timecode, const rational &length, const AudioRenderingParams &params, const QAtomicInt* cancelled)
 {
   if (!open_ && !Open()) {
     return nullptr;
@@ -328,9 +328,9 @@ FramePtr FFmpegDecoder::RetrieveAudio(const rational &timecode, const rational &
     return nullptr;
   }
 
-  Index();
+  Index(cancelled);
 
-  Conform(params);
+  Conform(params, cancelled);
 
   WaveInput input(GetConformedFilename(params));
 
@@ -395,7 +395,7 @@ QString FFmpegDecoder::id()
   return "ffmpeg";
 }
 
-int64_t FFmpegDecoder::GetTimestampFromTime(const rational &time)
+int64_t FFmpegDecoder::GetTimestampFromTime(const rational &time, const QAtomicInt* cancelled)
 {
   if (!open_ && !Open()) {
     return -1;
@@ -408,19 +408,19 @@ int64_t FFmpegDecoder::GetTimestampFromTime(const rational &time)
   target_ts += avstream_->start_time;
 
   // Find closest actual timebase in the file
-  target_ts = GetClosestTimestampInIndex(target_ts);
+  target_ts = GetClosestTimestampInIndex(target_ts, cancelled);
 
   return target_ts;
 }
 
-void FFmpegDecoder::Conform(const AudioRenderingParams &params)
+void FFmpegDecoder::Conform(const AudioRenderingParams &params, const QAtomicInt* cancelled)
 {
   if (avstream_->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
     // Nothing to be done
     return;
   }
 
-  Index();
+  Index(cancelled);
 
   // Get indexed WAV file
   WaveInput input(GetIndexFilename());
@@ -470,6 +470,10 @@ void FFmpegDecoder::Conform(const AudioRenderingParams &params)
     int input_buffer_sz = input.params().time_to_bytes(1);
 
     while (!input.at_end()) {
+      if (cancelled && *cancelled) {
+        break;
+      }
+
       // Read up to one second of audio from WAV file
       QByteArray read_samples = input.read(input_buffer_sz);
 
@@ -486,6 +490,11 @@ void FFmpegDecoder::Conform(const AudioRenderingParams &params)
     swr_free(&resampler);
     conformed_output.close();
     input.close();
+
+    // If we cancelled, the conform didn't finish so remove it
+    if (cancelled && *cancelled) {
+      QFile(conformed_fn).remove();
+    }
   } else {
     qWarning() << "Failed to conform file:" << stream()->footage()->filename();
   }
@@ -531,7 +540,7 @@ void FFmpegDecoder::ConformInternal(SwrContext* resampler, WaveOutput* output, c
   output->write(out_samples);
 }
 
-bool FFmpegDecoder::Probe(Footage *f)
+bool FFmpegDecoder::Probe(Footage *f, const QAtomicInt* cancelled)
 {
   if (open_) {
     qWarning() << "Probe must be called while the Decoder is closed";
@@ -648,7 +657,7 @@ bool FFmpegDecoder::Probe(Footage *f)
     Open();
 
     // Use index to find duration
-    Index();
+    Index(cancelled);
 
     // Use last frame index as the duration
     // FIXME: Does this skip the last frame?
@@ -688,7 +697,7 @@ void FFmpegDecoder::Error(const QString &s)
   Close();
 }
 
-void FFmpegDecoder::Index()
+void FFmpegDecoder::Index(const QAtomicInt* cancelled)
 {
   if (!open_) {
     qWarning() << "Indexing function tried to run while decoder was closed";
@@ -699,11 +708,11 @@ void FFmpegDecoder::Index()
 
   if (stream()->type() == Stream::kVideo) {
 
-    ValidateVideoIndex();
+    ValidateVideoIndex(cancelled);
 
   } else if (stream()->type() == Stream::kAudio) {
     if (!QFileInfo::exists(GetIndexFilename())) {
-      UnconditionalAudioIndex(pkt_, frame_);
+      UnconditionalAudioIndex(pkt_, frame_, cancelled);
     }
   }
 }
@@ -746,7 +755,7 @@ QString FFmpegDecoder::GetConformedFilename(const AudioRenderingParams &params)
   return index_fn;
 }
 
-void FFmpegDecoder::UnconditionalAudioIndex(AVPacket *pkt, AVFrame *frame)
+void FFmpegDecoder::UnconditionalAudioIndex(AVPacket *pkt, AVFrame *frame, const QAtomicInt* cancelled)
 {
   // Iterate through each audio frame and extract the PCM data
 
@@ -792,6 +801,11 @@ void FFmpegDecoder::UnconditionalAudioIndex(AVPacket *pkt, AVFrame *frame)
 
   if (wave_out.open()) {
     while (true) {
+      // Check if we have a `cancelled` ptr and its value
+      if (cancelled && *cancelled) {
+        break;
+      }
+
       ret = GetFrame(pkt, frame);
 
       if (ret < 0) {
@@ -837,6 +851,11 @@ void FFmpegDecoder::UnconditionalAudioIndex(AVPacket *pkt, AVFrame *frame)
     }
 
     wave_out.close();
+
+    if (cancelled && *cancelled) {
+      // Audio index didn't complete, delete it
+      QFile(GetIndexFilename()).remove();
+    }
   } else {
     qWarning() << "Failed to open WAVE output for indexing";
   }
@@ -848,7 +867,7 @@ void FFmpegDecoder::UnconditionalAudioIndex(AVPacket *pkt, AVFrame *frame)
   Seek(0);
 }
 
-void FFmpegDecoder::UnconditionalVideoIndex(AVPacket* pkt, AVFrame* frame)
+void FFmpegDecoder::UnconditionalVideoIndex(AVPacket* pkt, AVFrame* frame, const QAtomicInt* cancelled)
 {
   VideoStreamPtr video_stream = std::static_pointer_cast<VideoStream>(stream());
 
@@ -863,6 +882,11 @@ void FFmpegDecoder::UnconditionalVideoIndex(AVPacket* pkt, AVFrame* frame)
   int ret;
 
   while (true) {
+    // Check if we have a `cancelled` ptr and its value
+    if (cancelled && *cancelled) {
+      break;
+    }
+
     ret = GetFrame(pkt, frame);
 
     if (ret >= 0) {
@@ -875,11 +899,16 @@ void FFmpegDecoder::UnconditionalVideoIndex(AVPacket* pkt, AVFrame* frame)
     }
   }
 
-  video_stream->append_frame_index(VideoStream::kEndTimestamp);
+  // Check if we have a `cancelled` ptr and its value
+  if (cancelled && *cancelled) {
+    video_stream->clear_frame_index();
+  } else {
+    video_stream->append_frame_index(VideoStream::kEndTimestamp);
 
-  // Save index to file
-  if (!video_stream->save_frame_index(GetIndexFilename())) {
-    qWarning() << QStringLiteral("Failed to save index for %1").arg(stream()->footage()->filename());
+    // Save index to file
+    if (!video_stream->save_frame_index(GetIndexFilename())) {
+      qWarning() << QStringLiteral("Failed to save index for %1").arg(stream()->footage()->filename());
+    }
   }
 
   Seek(0);
@@ -930,7 +959,7 @@ int FFmpegDecoder::GetFrame(AVPacket *pkt, AVFrame *frame)
   return ret;
 }
 
-int64_t FFmpegDecoder::GetClosestTimestampInIndex(const int64_t &ts)
+int64_t FFmpegDecoder::GetClosestTimestampInIndex(const int64_t &ts, const QAtomicInt* cancelled)
 {
   VideoStreamPtr video_stream = std::static_pointer_cast<VideoStream>(stream());
 
@@ -942,7 +971,7 @@ int64_t FFmpegDecoder::GetClosestTimestampInIndex(const int64_t &ts)
     // If not, check if the frame index has been populated
     if (!video_stream->is_frame_index_ready()) {
       // If not, make a frame index
-      ValidateVideoIndex();
+      ValidateVideoIndex(cancelled);
     }
 
     video_stream->index_process_lock()->unlock();
@@ -954,6 +983,10 @@ int64_t FFmpegDecoder::GetClosestTimestampInIndex(const int64_t &ts)
   int64_t closest_ts = -1;
 
   do {
+    if (cancelled && *cancelled) {
+      return -1;
+    }
+
     if (index_is_being_created && video_stream->index_process_lock()->tryLock()) {
       index_is_being_created = false;
       video_stream->index_process_lock()->unlock();
@@ -969,7 +1002,7 @@ int64_t FFmpegDecoder::GetClosestTimestampInIndex(const int64_t &ts)
   return closest_ts;
 }
 
-void FFmpegDecoder::ValidateVideoIndex()
+void FFmpegDecoder::ValidateVideoIndex(const QAtomicInt* cancelled)
 {
   VideoStreamPtr video_stream = std::static_pointer_cast<VideoStream>(stream());
 
@@ -981,7 +1014,7 @@ void FFmpegDecoder::ValidateVideoIndex()
     // Reset state
     Seek(0);
 
-    UnconditionalVideoIndex(pkt_, frame_);
+    UnconditionalVideoIndex(pkt_, frame_, cancelled);
 
     Seek(0);
   }
diff --git a/app/codec/ffmpeg/ffmpegdecoder.h b/app/codec/ffmpeg/ffmpegdecoder.h
index ff27b63fa..eae48d23b 100644
--- a/app/codec/ffmpeg/ffmpegdecoder.h
+++ b/app/codec/ffmpeg/ffmpegdecoder.h
@@ -47,25 +47,25 @@ public:
   // Destructor
   virtual ~FFmpegDecoder() override;
 
-  virtual bool Probe(Footage *f) override;
+  virtual bool Probe(Footage *f, const QAtomicInt *cancelled) override;
 
   virtual bool Open() override;
-  virtual FramePtr RetrieveVideo(const rational &timecode) override;
-  virtual FramePtr RetrieveAudio(const rational &timecode, const rational &length, const AudioRenderingParams& params) override;
+  virtual FramePtr RetrieveVideo(const rational &timecode, const QAtomicInt *cancelled) override;
+  virtual FramePtr RetrieveAudio(const rational &timecode, const rational &length, const AudioRenderingParams& params, const QAtomicInt *cancelled) override;
   virtual void Close() override;
 
   virtual QString id() override;
 
-  virtual int64_t GetTimestampFromTime(const rational& time) override;
+  virtual int64_t GetTimestampFromTime(const rational& time, const QAtomicInt *cancelled) override;
 
-  virtual void Conform(const AudioRenderingParams& params) override;
+  virtual void Conform(const AudioRenderingParams& params, const QAtomicInt *cancelled) override;
 
   virtual bool SupportsVideo() override;
   virtual bool SupportsAudio() override;
 
   void SetMultithreading(bool e);
 
-  virtual void Index() override;
+  virtual void Index(const QAtomicInt *cancelled) override;
 
 private:
   void ConformInternal(SwrContext *resampler, WaveOutput *output, const char *in_data, int in_sample_count);
@@ -110,12 +110,12 @@ private:
    */
   QString GetConformedFilename(const AudioRenderingParams &params);
 
-  void UnconditionalAudioIndex(AVPacket* pkt, AVFrame* frame);
-  void UnconditionalVideoIndex(AVPacket* pkt, AVFrame* frame);
+  void UnconditionalAudioIndex(AVPacket* pkt, AVFrame* frame, const QAtomicInt* cancelled);
+  void UnconditionalVideoIndex(AVPacket* pkt, AVFrame* frame, const QAtomicInt* cancelled);
 
-  int64_t GetClosestTimestampInIndex(const int64_t& ts);
+  int64_t GetClosestTimestampInIndex(const int64_t& ts, const QAtomicInt *cancelled);
 
-  void ValidateVideoIndex();
+  void ValidateVideoIndex(const QAtomicInt* cancelled);
 
   void Seek(int64_t timestamp);
 
diff --git a/app/codec/oiio/oiiodecoder.cpp b/app/codec/oiio/oiiodecoder.cpp
index da179de99..f47de4488 100644
--- a/app/codec/oiio/oiiodecoder.cpp
+++ b/app/codec/oiio/oiiodecoder.cpp
@@ -38,7 +38,7 @@ QString OIIODecoder::id()
   return "oiio";
 }
 
-bool OIIODecoder::Probe(Footage *f)
+bool OIIODecoder::Probe(Footage *f, const QAtomicInt *cancelled)
 {
   // We prioritize OIIO over FFmpeg to pick up still images more effectively, but some OIIO decoders (notably OpenJPEG)
   // will segfault entirely if given unexpected data (an MPEG-4 for instance). To workaround this issue, we use OIIO's
@@ -133,7 +133,7 @@ bool OIIODecoder::Open()
   return true;
 }
 
-FramePtr OIIODecoder::RetrieveVideo(const rational &timecode)
+FramePtr OIIODecoder::RetrieveVideo(const rational &timecode, const QAtomicInt *cancelled)
 {
   if (!open_ && !Open()) {
     return nullptr;
@@ -174,7 +174,7 @@ void OIIODecoder::Close()
   frame_ = nullptr;
 }
 
-int64_t OIIODecoder::GetTimestampFromTime(const rational &time)
+int64_t OIIODecoder::GetTimestampFromTime(const rational &time, const QAtomicInt *cancelled)
 {
   Q_UNUSED(time)
 
diff --git a/app/codec/oiio/oiiodecoder.h b/app/codec/oiio/oiiodecoder.h
index f4977c40f..4574d7505 100644
--- a/app/codec/oiio/oiiodecoder.h
+++ b/app/codec/oiio/oiiodecoder.h
@@ -33,15 +33,15 @@ public:
 
   virtual QString id() override;
 
-  virtual bool Probe(Footage *f) override;
+  virtual bool Probe(Footage *f, const QAtomicInt* cancelled) override;
 
   virtual bool Open() override;
 
-  virtual FramePtr RetrieveVideo(const rational &timecode) override;
+  virtual FramePtr RetrieveVideo(const rational &timecode, const QAtomicInt* cancelled) override;
 
   virtual void Close() override;
 
-  virtual int64_t GetTimestampFromTime(const rational &time) override;
+  virtual int64_t GetTimestampFromTime(const rational &time, const QAtomicInt* cancelled) override;
 
   virtual bool SupportsVideo() override;
 
diff --git a/app/common/CMakeLists.txt b/app/common/CMakeLists.txt
index c4dbe01c2..1d123450b 100644
--- a/app/common/CMakeLists.txt
+++ b/app/common/CMakeLists.txt
@@ -18,6 +18,7 @@ set(OLIVE_SOURCES
   ${OLIVE_SOURCES}
   common/bezier.h
   common/bezier.cpp
+  common/cancelableobject.h
   common/channellayout.h
   common/clamp.h
   common/constructors.h
diff --git a/app/common/cancelableobject.h b/app/common/cancelableobject.h
new file mode 100644
index 000000000..008a97bfe
--- /dev/null
+++ b/app/common/cancelableobject.h
@@ -0,0 +1,26 @@
+#ifndef CANCELABLEOBJECT_H
+#define CANCELABLEOBJECT_H
+
+#include <QAtomicInt>
+
+class CancelableObject {
+public:
+  CancelableObject() :
+    cancelled_(false)
+  {
+  }
+
+  void Cancel() {
+    cancelled_ = true;
+  }
+
+  const QAtomicInt& IsCancelled() const {
+    return cancelled_;
+  }
+
+private:
+  QAtomicInt cancelled_;
+
+};
+
+#endif // CANCELABLEOBJECT_H
diff --git a/app/node/input.cpp b/app/node/input.cpp
index 85a211568..77d5c63b9 100644
--- a/app/node/input.cpp
+++ b/app/node/input.cpp
@@ -86,21 +86,33 @@ QString NodeInput::name()
   return NodeParam::name();
 }
 
-void NodeInput::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections)
+void NodeInput::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt *cancelled)
 {
   XMLAttributeLoop(reader, attr) {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (attr.name() == "keyframing") {
       set_is_keyframing(attr.value() == "1");
     }
   }
 
   XMLReadLoop(reader, "input") {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (reader->isStartElement()) {
       if (reader->name() == "standard") {
         // Load standard value
         int val_index = 0;
 
         XMLReadLoop(reader, "standard") {
+          if (cancelled && *cancelled) {
+            return;
+          }
+
           if (reader->isStartElement() && reader->name() == "value") {
             reader->readNext();
 
@@ -119,8 +131,16 @@ void NodeInput::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& par
         int track = 0;
 
         XMLReadLoop(reader, "keyframes") {
+          if (cancelled && *cancelled) {
+            return;
+          }
+
           if (reader->isStartElement() && reader->name() == "track") {
             XMLReadLoop(reader, "track") {
+              if (cancelled && *cancelled) {
+                return;
+              }
+
               if (reader->name() == "key") {
                 rational key_time;
                 NodeKeyframe::Type key_type;
@@ -129,6 +149,10 @@ void NodeInput::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& par
                 QPointF key_out_handle;
 
                 XMLAttributeLoop(reader, attr) {
+                  if (cancelled && *cancelled) {
+                    return;
+                  }
+
                   if (attr.name() == "time") {
                     key_time = rational::fromString(attr.value().toString());
                   } else if (attr.name() == "type") {
@@ -161,6 +185,10 @@ void NodeInput::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& par
         }
       } else if (reader->name() == "connections") {
         XMLReadLoop(reader, "connections") {
+          if (cancelled && *cancelled) {
+            return;
+          }
+
           if (reader->isStartElement() && reader->name() == "connection") {
             reader->readNext();
 
@@ -168,7 +196,7 @@ void NodeInput::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& par
           }
         }
       } else {
-        LoadInternal(reader, param_ptrs, input_connections, footage_connections);
+        LoadInternal(reader, param_ptrs, input_connections, footage_connections, cancelled);
       }
     }
   }
@@ -242,7 +270,7 @@ const NodeParam::DataType &NodeInput::data_type() const
   return data_type_;
 }
 
-void NodeInput::LoadInternal(QXmlStreamReader*, QHash<quintptr, NodeOutput *>&, QList<SerializedConnection>&, QList<FootageConnection>&)
+void NodeInput::LoadInternal(QXmlStreamReader*, QHash<quintptr, NodeOutput *>&, QList<SerializedConnection>&, QList<FootageConnection>&, const QAtomicInt*)
 {
 }
 
diff --git a/app/node/input.h b/app/node/input.h
index 80f703ba5..6957c7bfc 100644
--- a/app/node/input.h
+++ b/app/node/input.h
@@ -54,7 +54,7 @@ public:
 
   virtual QString name() override;
 
-  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections) override;
+  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt* cancelled) override;
 
   virtual void Save(QXmlStreamWriter* writer) const override;
 
@@ -243,7 +243,7 @@ signals:
   void KeyframeRemoved(NodeKeyframePtr key);
 
 protected:
-  virtual void LoadInternal(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections);
+  virtual void LoadInternal(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt* cancelled);
 
   virtual void SaveInternal(QXmlStreamWriter* writer) const;
 
diff --git a/app/node/inputarray.cpp b/app/node/inputarray.cpp
index 7cc68015f..e7d0e0e01 100644
--- a/app/node/inputarray.cpp
+++ b/app/node/inputarray.cpp
@@ -164,13 +164,13 @@ void NodeInputArray::RemoveAt(int index)
   RemoveLast();
 }
 
-void NodeInputArray::LoadInternal(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections)
+void NodeInputArray::LoadInternal(QXmlStreamReader *reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt* cancelled)
 {
   if (reader->name() == "subparameters") {
     XMLReadLoop(reader, "subparameters") {
       if (reader->name() == "input") {
         Append();
-        At(GetSize() - 1)->Load(reader, param_ptrs, input_connections, footage_connections);
+        At(GetSize() - 1)->Load(reader, param_ptrs, input_connections, footage_connections, cancelled);
       }
     }
   }
diff --git a/app/node/inputarray.h b/app/node/inputarray.h
index d4a913164..a0a36d6c1 100644
--- a/app/node/inputarray.h
+++ b/app/node/inputarray.h
@@ -33,7 +33,7 @@ signals:
   void SizeChanged(int size);
 
 protected:
-  virtual void LoadInternal(QXmlStreamReader* reader, QHash<quintptr, NodeOutput *> &param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections) override;
+  virtual void LoadInternal(QXmlStreamReader* reader, QHash<quintptr, NodeOutput *> &param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt *cancelled) override;
 
   virtual void SaveInternal(QXmlStreamWriter* writer) const override;
 
diff --git a/app/node/node.cpp b/app/node/node.cpp
index 77d10fac5..38a3b6500 100644
--- a/app/node/node.cpp
+++ b/app/node/node.cpp
@@ -50,9 +50,13 @@ Node::~Node()
   }
 }
 
-void Node::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput *> &output_ptrs, QList<NodeInput::SerializedConnection>& input_connections, QList<NodeParam::FootageConnection>& footage_connections, const QString& element)
+void Node::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput *> &output_ptrs, QList<NodeInput::SerializedConnection>& input_connections, QList<NodeParam::FootageConnection>& footage_connections, const QAtomicInt* cancelled, const QString& element)
 {
   XMLReadLoop(reader, (element.isEmpty() ? "node" : element)) {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (reader->isStartElement()) {
       if (reader->name() == "input" || reader->name() == "output") {
         QString param_id;
@@ -77,7 +81,7 @@ void Node::Load(QXmlStreamReader *reader, QHash<quintptr, NodeOutput *> &output_
           continue;
         }
 
-        param->Load(reader, output_ptrs, input_connections, footage_connections);
+        param->Load(reader, output_ptrs, input_connections, footage_connections, cancelled);
       }
     }
   }
diff --git a/app/node/node.h b/app/node/node.h
index 355b39b50..d14fef691 100644
--- a/app/node/node.h
+++ b/app/node/node.h
@@ -67,7 +67,7 @@ public:
   /**
    * @brief Clear current node variables and replace them with
    */
-  void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<NodeInput::SerializedConnection> &input_connections, QList<NodeParam::FootageConnection>& footage_connections, const QString &element = QString());
+  void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<NodeInput::SerializedConnection> &input_connections, QList<NodeParam::FootageConnection>& footage_connections, const QAtomicInt *cancelled, const QString &element = QString());
 
   /**
    * @brief Save this node into a text/XML format
diff --git a/app/node/output.cpp b/app/node/output.cpp
index a19f094c5..dd87ac9c1 100644
--- a/app/node/output.cpp
+++ b/app/node/output.cpp
@@ -42,9 +42,13 @@ QString NodeOutput::name()
   return NodeParam::name();
 }
 
-void NodeOutput::Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection>&, QList<FootageConnection>&)
+void NodeOutput::Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection>&, QList<FootageConnection>&, const QAtomicInt *cancelled)
 {
   XMLAttributeLoop(reader, attr) {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (attr.name() == "ptr") {
       quintptr saved_ptr = attr.value().toULongLong();
 
diff --git a/app/node/output.h b/app/node/output.h
index 6107aaf50..0bbf594e7 100644
--- a/app/node/output.h
+++ b/app/node/output.h
@@ -42,7 +42,7 @@ public:
 
   virtual QString name() override;
 
-  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections) override;
+  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt* cancelled) override;
 
   virtual void Save(QXmlStreamWriter* writer) const override;
 
diff --git a/app/node/param.h b/app/node/param.h
index c88b1fb1b..dc6ac7557 100644
--- a/app/node/param.h
+++ b/app/node/param.h
@@ -242,7 +242,7 @@ public:
   /**
    * @brief Load function
    */
-  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections) = 0;
+  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<SerializedConnection> &input_connections, QList<FootageConnection>& footage_connections, const QAtomicInt* cancelled) = 0;
 
   /**
    * @brief Save function
diff --git a/app/project/item/folder/folder.cpp b/app/project/item/folder/folder.cpp
index 5f26b0d29..35a516332 100644
--- a/app/project/item/folder/folder.cpp
+++ b/app/project/item/folder/folder.cpp
@@ -44,15 +44,23 @@ QIcon Folder::icon()
   return icon::Folder;
 }
 
-void Folder::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection>& footage_connections)
+void Folder::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection>& footage_connections, const QAtomicInt *cancelled)
 {
   XMLAttributeLoop(reader, attr) {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (attr.name() == "name") {
       set_name(attr.value().toString());
     }
   }
 
   XMLReadLoop(reader, "folder") {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (reader->isStartElement()) {
       ItemPtr child;
 
@@ -67,7 +75,7 @@ void Folder::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &footage_
       }
 
       add_child(child);
-      child->Load(reader, footage_ptrs, footage_connections);
+      child->Load(reader, footage_ptrs, footage_connections, cancelled);
     }
   }
 }
diff --git a/app/project/item/folder/folder.h b/app/project/item/folder/folder.h
index 84e9498a9..145f3cd47 100644
--- a/app/project/item/folder/folder.h
+++ b/app/project/item/folder/folder.h
@@ -42,7 +42,7 @@ public:
 
   virtual QIcon icon() override;
 
-  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection> &footage_connections) override;
+  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection> &footage_connections, const QAtomicInt *cancelled) override;
 
   virtual void Save(QXmlStreamWriter* writer) const override;
 
diff --git a/app/project/item/footage/footage.cpp b/app/project/item/footage/footage.cpp
index ca06e4f04..180a6ce92 100644
--- a/app/project/item/footage/footage.cpp
+++ b/app/project/item/footage/footage.cpp
@@ -37,7 +37,7 @@ Footage::~Footage()
   ClearStreams();
 }
 
-void Footage::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr>& footage_ptrs, QList<NodeParam::FootageConnection>&)
+void Footage::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr>& footage_ptrs, QList<NodeParam::FootageConnection>&, const QAtomicInt* cancelled)
 {
   QXmlStreamAttributes attributes = reader->attributes();
 
@@ -49,15 +49,23 @@ void Footage::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr>& footage
     }
   }
 
-  Decoder::ProbeMedia(this);
+  Decoder::ProbeMedia(this, cancelled);
 
   XMLReadLoop(reader, "footage") {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (reader->isStartElement()) {
       if (reader->name() == "stream") {
         int stream_index = -1;
         quintptr stream_ptr = 0;
 
         XMLAttributeLoop(reader, attr) {
+          if (cancelled && *cancelled) {
+            return;
+          }
+
           if (attr.name() == "index") {
             stream_index = attr.value().toInt();
           } else if (attr.name() == "ptr") {
diff --git a/app/project/item/footage/footage.h b/app/project/item/footage/footage.h
index d5c7def03..42226d64d 100644
--- a/app/project/item/footage/footage.h
+++ b/app/project/item/footage/footage.h
@@ -63,7 +63,7 @@ public:
   /**
    * @brief Load function
    */
-  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection> &footage_connections) override;
+  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection> &footage_connections, const QAtomicInt *cancelled) override;
 
   /**
    * @brief Save function
diff --git a/app/project/item/sequence/sequence.cpp b/app/project/item/sequence/sequence.cpp
index b6d5dcbe8..edb0b5ab7 100644
--- a/app/project/item/sequence/sequence.cpp
+++ b/app/project/item/sequence/sequence.cpp
@@ -42,9 +42,13 @@ Sequence::Sequence()
   AddNode(viewer_output_);
 }
 
-void Sequence::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &, QList<NodeInput::FootageConnection>& footage_connections)
+void Sequence::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &, QList<NodeInput::FootageConnection>& footage_connections, const QAtomicInt *cancelled)
 {
   XMLAttributeLoop(reader, attr) {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (attr.name() == "name") {
       set_name(attr.value().toString());
 
@@ -56,12 +60,20 @@ void Sequence::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &, QLis
   QList<NodeParam::SerializedConnection> desired_connections;
 
   XMLReadLoop(reader, "sequence") {
+    if (cancelled && *cancelled) {
+      return;
+    }
+
     if (reader->isStartElement()) {
       if (reader->name() == "video") {
         int video_width, video_height;
         rational video_timebase;
 
         XMLReadLoop(reader, "video") {
+          if (cancelled && *cancelled) {
+            return;
+          }
+
           if (reader->isStartElement()) {
             if (reader->name() == "width") {
               reader->readNext();
@@ -125,7 +137,7 @@ void Sequence::Load(QXmlStreamReader *reader, QHash<quintptr, StreamPtr> &, QLis
         }
 
         if (node) {
-          node->Load(reader, output_ptrs, desired_connections, footage_connections, reader->name().toString());
+          node->Load(reader, output_ptrs, desired_connections, footage_connections, cancelled, reader->name().toString());
 
           AddNode(node);
         }
diff --git a/app/project/item/sequence/sequence.h b/app/project/item/sequence/sequence.h
index 33be50326..c4ad7f4e8 100644
--- a/app/project/item/sequence/sequence.h
+++ b/app/project/item/sequence/sequence.h
@@ -42,7 +42,7 @@ public:
   /**
    * @brief Load function
    */
-  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection> &footage_connections) override;
+  virtual void Load(QXmlStreamReader* reader, QHash<quintptr, StreamPtr> &footage_ptrs, QList<NodeParam::FootageConnection> &footage_connections, const QAtomicInt* cancelled) override;
 
   /**
    * @brief Save function
diff --git a/app/project/project.cpp b/app/project/project.cpp
index 2459a285d..4cb69bd59 100644
--- a/app/project/project.cpp
+++ b/app/project/project.cpp
@@ -25,7 +25,7 @@
 
 #include "common/xmlreadloop.h"
 #include "core.h"
-#include "dialog/loadsave/loadsave.h"
+#include "dialog/progress/progress.h"
 #include "window/mainwindow/mainwindow.h"
 
 Project::Project()
@@ -33,7 +33,7 @@ Project::Project()
   root_.set_project(this);
 }
 
-void Project::Load(QXmlStreamReader *reader)
+void Project::Load(QXmlStreamReader *reader, const QAtomicInt* cancelled)
 {
   QHash<quintptr, StreamPtr> footage_ptrs;
   QList<NodeInput::FootageConnection> footage_connections;
@@ -43,7 +43,7 @@ void Project::Load(QXmlStreamReader *reader)
       if (reader->name() == "folder") {
 
         // Assume this folder is our root
-        root_.Load(reader, footage_ptrs, footage_connections);
+        root_.Load(reader, footage_ptrs, footage_connections, cancelled);
 
       } else if (reader->name() == "colormanagement") {
 
diff --git a/app/project/project.h b/app/project/project.h
index 2c32068c0..b7ee369e1 100644
--- a/app/project/project.h
+++ b/app/project/project.h
@@ -44,7 +44,7 @@ class Project : public QObject
 public:
   Project();
 
-  void Load(QXmlStreamReader* reader);
+  void Load(QXmlStreamReader* reader, const QAtomicInt* cancelled);
 
   void Save(QXmlStreamWriter* writer) const;