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obu: fix parsing force_integer_mv on frame headers

--- a/src/obu.c

+++ b/src/obu.c

@@ -358,6 +358,11 @@

     if (hdr->allow_screen_content_tools)

         hdr->force_integer_mv = seqhdr->force_integer_mv == ADAPTIVE ?

                                 dav1d_get_bits(gb, 1) : seqhdr->force_integer_mv;

+    else

+        hdr->force_integer_mv = 0;

+

+    if (!(hdr->frame_type & 1))

+        hdr->force_integer_mv = 1;

     if (seqhdr->frame_id_numbers_present)

         hdr->frame_id = dav1d_get_bits(gb, seqhdr->frame_id_n_bits);