diff -Npur ffmpeg-5.1.2/libavformat/rtsp.c ffmpeg-5.1.2-change/libavformat/rtsp.c
--- ffmpeg-5.1.2/libavformat/rtsp.c	2022-07-23 01:58:39.000000000 +0800
+++ ffmpeg-5.1.2-change/libavformat/rtsp.c	2024-06-25 16:37:03.333689422 +0800
@@ -409,7 +409,7 @@ static void parse_fmtp(AVFormatContext *
         if (rtsp_st->sdp_payload_type == payload_type &&
             rtsp_st->dynamic_handler &&
             rtsp_st->dynamic_handler->parse_sdp_a_line) {
-            rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
+            rtsp_st->dynamic_handler->parse_sdp_a_line(s, rtsp_st->stream_index,
                 rtsp_st->dynamic_protocol_context, line);
         }
     }