diff --git a/src/drivers/Qt/AviRecord.cpp b/src/drivers/Qt/AviRecord.cpp
index 0e1f3705..5643b00d 100644
--- a/src/drivers/Qt/AviRecord.cpp
+++ b/src/drivers/Qt/AviRecord.cpp
@@ -2557,7 +2557,7 @@ void AviRecordDiskThread_t::run(void)
 			{
 				convertRgb_32_to_24( (const unsigned char*)videoOut, rgb24,
 						width, height, numPixels, true );
-				writeAudio = VFW::encode_frame( rgb24, width, height ) > 0;
+				VFW::encode_frame( rgb24, width, height );
 			}
 			#endif
 			#ifdef _USE_LIBAV
diff --git a/src/drivers/Qt/avi/gwavi.cpp b/src/drivers/Qt/avi/gwavi.cpp
index 753f9f5e..13326cd9 100644
--- a/src/drivers/Qt/avi/gwavi.cpp
+++ b/src/drivers/Qt/avi/gwavi.cpp
@@ -374,9 +374,12 @@ gwavi_t::add_frame( unsigned char *buffer, size_t len, unsigned int flags)
 		return -1;
 	}
 
-	if ((t = fwrite(buffer, 1, len, out)) != len) {
-		(void)fprintf(stderr, "gwavi_add_frame: fwrite() failed\n");
-		return -1;
+	if ( len > 0 )
+	{
+		if ((t = fwrite(buffer, 1, len, out)) != len) {
+			(void)fprintf(stderr, "gwavi_add_frame: fwrite() failed\n");
+			return -1;
+		}
 	}
 
 	for (t = 0; t < maxi_pad; t++)