Fix duplicated audio from previous commit.

Related to #816

src/lib/audio/audioStreamInfo.cpp

@@ -25,7 +25,7 @@ AudioStreamInfo::AudioStreamInfo(const std::shared_ptr<Mlt::Producer> &producer,
 {
     // Fetch audio streams
     int streams = producer->get_int("meta.media.nb_streams");
-    if (playlist) {
+    if (playlist && streams == 0) {
         // Playlist clips do not provide stream info
         m_audioStreams.insert(0, i18n("Audio"));
     }

src/mltcontroller/clipcontroller.cpp

@@ -262,7 +262,7 @@ void ClipController::getInfoForProducer()
         m_clipType = ClipType::Unknown;
     }
     if (audioIndex > -1 || m_clipType == ClipType::Playlist) {
-        m_audioInfo = std::make_unique<AudioStreamInfo>(m_masterProducer, audioIndex, true);
+        m_audioInfo = std::make_unique<AudioStreamInfo>(m_masterProducer, audioIndex, m_clipType == ClipType::Playlist);
         // Load stream effects
         for (int stream : m_audioInfo->streams().keys()) {
             QString streamEffect = m_properties->get(QString("kdenlive:stream:%1").arg(stream).toUtf8().constData());