videoio(dshow) fix incompatible media type left set on video device

diff --git a/modules/videoio/src/cap_dshow.cpp b/modules/videoio/src/cap_dshow.cpp
index cf653f6..d80e13a 100644 (file)
--- a/modules/videoio/src/cap_dshow.cpp
+++ b/modules/videoio/src/cap_dshow.cpp
@@ -2609,7 +2609,8 @@ static bool setSizeAndSubtype(videoDevice * VD, int attemptWidth, int attemptHei
         return true;
     }else{
         VD->streamConf->SetFormat(tmpType);
-        if( tmpType != NULL )MyDeleteMediaType(tmpType);
+        if( VD->pAmMediaType != NULL)MyDeleteMediaType(VD->pAmMediaType);
+        VD->pAmMediaType = tmpType;
     }
 
     return false;