libavcodec: mpeg12dec: fix broken decode with vaapi

There are (wrongly?) encoded input where the coded order of fields is different from the one specified in extension header. Without those flags, decoded output gets broken when vaapi is used. See also in mpeg_mc_decode_init() for XvMC.
0p1pp1 · Aug 2, 2018 · 311716d · 311716d
1 parent c71fc15
commit 311716d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
@@ -1327,6 +1327,8 @@ static int mpeg_decode_postinit(AVCodecContext *avctx)
 
         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
         setup_hwaccel_for_pixfmt(avctx);
+        if (avctx->hwaccel)
+            avctx->slice_flags |= SLICE_FLAG_CODED_ORDER | SLICE_FLAG_ALLOW_FIELD;
 
         /* Quantization matrices may need reordering
          * if DCT permutation is changed. */