+ if (inter && !s->last_frame.data[0]) {
+ av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
+ ret = ff_get_buffer(avctx, &s->last_frame, AV_GET_BUFFER_FLAG_REF);
+ if (ret < 0)
+ return ret;
+ memset(s->last_frame.data[0], 0, s->last_frame.height *
+ s->last_frame.linesize[0]);
+ memset(s->last_frame.data[1], 0x80, s->last_frame.height / 2 *
+ s->last_frame.linesize[1]);
+ memset(s->last_frame.data[2], 0x80, s->last_frame.height / 2 *
+ s->last_frame.linesize[2]);
+ }
+