videoio/MSMF: fixed audio stream handling

modules/videoio/src/cap_msmf.cpp

@@ -487,12 +487,14 @@ public:
             }
         }
     }
-    std::pair<MediaID, MediaType> findBest(const MediaType& newType)
+    std::pair<MediaID, MediaType> findBestVideoFormat(const MediaType& newType)
     {
         std::pair<MediaID, MediaType> best;
         std::map<MediaID, MediaType>::const_iterator i = formats.begin();
         for (; i != formats.end(); ++i)
         {
+            if (i->second.majorType != MFMediaType_Video)
+                continue;
             if (newType.isEmpty()) // file input - choose first returned media type
             {
                 best = *i;
@@ -770,7 +772,12 @@ bool CvCapture_MSMF::configureOutput(MediaType newType, cv::uint32_t outFormat)
 {
     FormatStorage formats;
     formats.read(videoFileSource.Get());
-    std::pair<FormatStorage::MediaID, MediaType> bestMatch = formats.findBest(newType);
+    std::pair<FormatStorage::MediaID, MediaType> bestMatch = formats.findBestVideoFormat(newType);
+    if (bestMatch.second.isEmpty())
+    {
+        CV_LOG_DEBUG(NULL, "Can not find video stream with requested parameters");
+        return false;
+    }
     dwStreamIndex = bestMatch.first.stream;
     nativeFormat = bestMatch.second;
     MediaType newFormat = nativeFormat;