conformed oiiodecoder to new retrieve functions

app/decoder/oiio/oiiodecoder.cpp

@@ -100,14 +100,13 @@ bool OIIODecoder::Open()
   return true;
 }
 
-FramePtr OIIODecoder::Retrieve(const rational &timecode, const rational &length)
+FramePtr OIIODecoder::RetrieveVideo(const rational &timecode)
 {
   if (!open_ && !Open()) {
     return nullptr;
   }
 
   Q_UNUSED(timecode)
-  Q_UNUSED(length)
 
   if (frame_ == nullptr) {
     frame_ = Frame::Create();
@@ -147,3 +146,8 @@ int64_t OIIODecoder::GetTimestampFromTime(const rational &time)
 
   return 0;
 }
+
+bool OIIODecoder::SupportsVideo()
+{
+  return true;
+}

app/decoder/oiio/oiiodecoder.h

@@ -37,12 +37,14 @@ public:
 
   virtual bool Open() override;
 
-  virtual FramePtr Retrieve(const rational &timecode, const rational &length = 0) override;
+  virtual FramePtr RetrieveVideo(const rational &timecode) override;
 
   virtual void Close() override;
 
   virtual int64_t GetTimestampFromTime(const rational &time) override;
 
+  virtual bool SupportsVideo() override;
+
 private:
   std::unique_ptr<OIIO::ImageInput> image_;