Use fixed caps on the src pad, they are not meant to change from video/x-vaapi-surface.

diff --git a/gst/vaapidecode/gstvaapidecode.c b/gst/vaapidecode/gstvaapidecode.c
index 3db683e..3d8ccc9 100644 (file)
--- a/gst/vaapidecode/gstvaapidecode.c
+++ b/gst/vaapidecode/gstvaapidecode.c
@@ -446,6 +446,7 @@ gst_vaapidecode_init(GstVaapiDecode *decode, GstVaapiDecodeClass *klass)
         "src"
     );
 
+    gst_pad_use_fixed_caps(decode->srcpad);
     gst_pad_set_event_function(decode->srcpad, gst_vaapidecode_src_event);
     gst_element_add_pad(GST_ELEMENT(decode), decode->srcpad);
 }