Merge commit '91bfac759dfd536e439ad3e35964705012c6a5a7'

* commit '91bfac759dfd536e439ad3e35964705012c6a5a7':
  h261enc: Disallow sliced encoding

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegvideo_enc.c

@@ -728,6 +728,7 @@ av_cold int ff_mpv_encode_init(AVCodecContext *avctx)
         s->out_format = FMT_H261;
         avctx->delay  = 0;
         s->low_delay  = 1;
+        s->rtp_mode   = 0; /* Sliced encoding not supported */
         break;
     case AV_CODEC_ID_H263:
         if (!CONFIG_H263_ENCODER)