Fix minor code issues

src/transcoder/transcodedialog.cpp

@@ -210,6 +210,9 @@ void TranscodeDialog::Cancel() {
 
 void TranscodeDialog::JobComplete(const QString &input, const QString &output, bool success) {
 
+  Q_UNUSED(input);
+  Q_UNUSED(output);
+
   (*(success ? &finished_success_ : &finished_failed_))++;
   queued_--;
 

src/transcoder/transcoder.h

@@ -51,7 +51,7 @@ struct TranscoderPreset {
   QString codec_mimetype_;
   QString muxer_mimetype_;
 };
-Q_DECLARE_METATYPE(TranscoderPreset);
+Q_DECLARE_METATYPE(TranscoderPreset)
 
 class Transcoder : public QObject {
   Q_OBJECT

src/transcoder/transcoderoptionsdialog.cpp

@@ -74,6 +74,7 @@ TranscoderOptionsDialog::~TranscoderOptionsDialog() {
 }
 
 void TranscoderOptionsDialog::showEvent(QShowEvent *e) {
+  Q_UNUSED(e);
   if (options_) {
     options_->Load();
   }