winegstreamer: Prefer YUV formats to RGB ones.

dlls/winegstreamer/gstdemux.c

@@ -1677,17 +1677,19 @@ static HRESULT gstdecoder_source_get_media_type(struct gstdemux_source *pin,
 {
     static const GstVideoFormat video_formats[] =
     {
-        /* Roughly ordered by preference from videoflip. */
+        /* Try to prefer YUV formats over RGB ones. Most decoders output in the
+         * YUV color space, and it's generally much less expensive for
+         * videoconvert to do YUV -> YUV transformations. */
         GST_VIDEO_FORMAT_AYUV,
-        GST_VIDEO_FORMAT_BGRA,
-        GST_VIDEO_FORMAT_BGRx,
-        GST_VIDEO_FORMAT_BGR,
         GST_VIDEO_FORMAT_I420,
         GST_VIDEO_FORMAT_YV12,
         GST_VIDEO_FORMAT_YUY2,
         GST_VIDEO_FORMAT_UYVY,
         GST_VIDEO_FORMAT_YVYU,
         GST_VIDEO_FORMAT_NV12,
+        GST_VIDEO_FORMAT_BGRA,
+        GST_VIDEO_FORMAT_BGRx,
+        GST_VIDEO_FORMAT_BGR,
     };
 
     if (!index)