avcodec/error_resilience: set AVFrame decode_error_flags in case of decoding error

Signed-off-by: Amir Pauker <amir@livelyvideo.tv>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/error_resilience.c

@@ -1121,6 +1121,8 @@ void ff_er_frame_end(ERContext *s)
     av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors in %c frame\n",
            dc_error, ac_error, mv_error, av_get_picture_type_char(s->cur_pic.f->pict_type));
 
+    s->cur_pic.f->decode_error_flags |= FF_DECODE_ERROR_CONCEALMENT_ACTIVE;
+
     is_intra_likely = is_intra_more_likely(s);
 
     /* set unknown mb-type to most likely */