The profile after reading headers can be different from when the context was 
initialized

Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/h263dec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index c082af1c52..f8a38083f2 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -546,6 +546,8 @@ retry:
     if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
         if (ff_mpeg4_workaround_bugs(avctx) == 1)
             goto retry;
+        if (s->studio_profile != (s->idsp.idct == NULL))
+            ff_mpv_idct_init(s);
     }
 
     /* After H.263 & MPEG-4 header decode we have the height, width,
-- 
2.17.0

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