renderer/decoder: use same background mechanism to conform audio as well

app/task/conform/conform.cpp

@@ -6,6 +6,7 @@ ConformTask::ConformTask(AudioStreamPtr stream, const AudioRenderingParams& para
   stream_(stream),
   params_(params)
 {
+  SetTitle(tr("Conforming Audio %1:%2").arg(stream_->footage()->filename(), QString::number(stream_->index())));
 }
 
 void ConformTask::Action()

app/task/index/index.cpp

@@ -1,6 +1,7 @@
 #include "index.h"
 
 #include "codec/decoder.h"
+#include "codec/ffmpeg/ffmpegdecoder.h"
 
 IndexTask::IndexTask(StreamPtr stream) :
   stream_(stream)
@@ -17,6 +18,11 @@ void IndexTask::Action()
 
     decoder->set_stream(stream_);
 
+    // Force multithreading for faster indexing
+    if (decoder->id() == "ffmpeg") {
+      static_cast<FFmpegDecoder*>(decoder.get())->SetMultithreading(true);
+    }
+
     connect(decoder.get(), &Decoder::IndexProgress, this, &IndexTask::ProgressChanged);
 
     decoder->Open();

app/task/taskmanager.cpp

@@ -164,6 +164,7 @@ void TaskManager::DeleteTask(Task *t)
       break;
     }
   }
+
   emit t->Removed();
 
   if (GetTaskStatus(t) != kWorking) {