winegstreamer: Set bFixedSizeSamples for WMF video formats.

dlls/winegstreamer/quartz_parser.c

@@ -314,6 +314,8 @@ static bool amt_from_wg_format_video(AM_MEDIA_TYPE *mt, const struct wg_format *
 
     mt->majortype = MEDIATYPE_Video;
     mt->subtype = *format_table[format->u.video.format].subtype;
+    if (wm)
+        mt->bFixedSizeSamples = TRUE;
     mt->bTemporalCompression = TRUE;
     mt->lSampleSize = 1;
     mt->formattype = FORMAT_VideoInfo;

dlls/wmvcore/tests/wmvcore.c

@@ -625,7 +625,7 @@ static void check_video_type(const WM_MEDIA_TYPE *mt)
     static const RECT rect = {.right = 64, .bottom = 48};
 
     ok(IsEqualGUID(&mt->formattype, &FORMAT_VideoInfo), "Got format %s.\n", debugstr_guid(&mt->formattype));
-    todo_wine ok(mt->bFixedSizeSamples == TRUE, "Got fixed size %d.\n", mt->bFixedSizeSamples);
+    ok(mt->bFixedSizeSamples == TRUE, "Got fixed size %d.\n", mt->bFixedSizeSamples);
     todo_wine ok(!mt->bTemporalCompression, "Got temporal compression %d.\n", mt->bTemporalCompression);
     ok(!mt->pUnk, "Got pUnk %p.\n", mt->pUnk);