From a87a96105e9150dba07e3a660e41f78557f3356c Mon Sep 17 00:00:00 2001
From: Marton Balint <cus@passwd.hu>
Date: Mon, 26 Aug 2024 23:07:35 +0200
Subject: [PATCH] avformat/libzmq: fix check for zmq protocol prefix

Fixes ticket #11134.

Signed-off-by: Marton Balint <cus@passwd.hu>
---
 libavformat/libzmq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/libzmq.c b/libavformat/libzmq.c
index f4bb849e46..da84efee73 100644
--- a/libavformat/libzmq.c
+++ b/libavformat/libzmq.c
@@ -94,7 +94,7 @@ static int zmq_proto_open(URLContext *h, const char *uri, int flags)
         return AVERROR_EXTERNAL;
     }
 
-    if (av_strstart(uri, "zmq:", &uri)) {
+    if (!av_strstart(uri, "zmq:", &uri)) {
         av_log(h, AV_LOG_ERROR, "URL %s lacks prefix\n", uri);
         return AVERROR(EINVAL);
     }