diff --git a/libavformat/rtp.c b/libavformat/rtp.c
index e81d2c2ad8..b76e521a8c 100644
--- a/libavformat/rtp.c
+++ b/libavformat/rtp.c
@@ -103,7 +103,7 @@ int ff_rtp_get_payload_type(AVFormatContext *fmt,
     /* static payload type */
     for (i = 0; rtp_payload_types[i].pt >= 0; ++i)
         if (rtp_payload_types[i].codec_id == codec->codec_id) {
-            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt ||
+            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat ||
                 !fmt->oformat->priv_class || !fmt->priv_data ||
                 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190")))
                 continue;
diff --git a/libavformat/rtpenc_chain.c b/libavformat/rtpenc_chain.c
index df7410d0c8..70d68ce534 100644
--- a/libavformat/rtpenc_chain.c
+++ b/libavformat/rtpenc_chain.c
@@ -64,7 +64,7 @@ int ff_rtp_chain_mux_open(AVFormatContext **out, AVFormatContext *s,
     /* Get the payload type from the codec */
     if (st->id < RTP_PT_PRIVATE)
         rtpctx->streams[0]->id =
-            ff_rtp_get_payload_type(rtpctx, st->codec, idx);
+            ff_rtp_get_payload_type(s, st->codec, idx);
     else
         rtpctx->streams[0]->id = st->id;