began custom pix fmt converter

decoders/ffmpegdecoder.cpp

@@ -4,3 +4,29 @@ FFmpegDecoder::FFmpegDecoder()
 {
 
 }
+
+bool FFmpegDecoder::Open()
+{
+  if (open_) {
+    return true;
+  }
+
+
+}
+
+void FFmpegDecoder::Request(const rational &timecode)
+{
+
+}
+
+void FFmpegDecoder::Retrieve(uint8_t **buffer, int *linesize)
+{
+
+}
+
+void FFmpegDecoder::Close()
+{
+  if (!open_) {
+    return;
+  }
+}