diff --git a/nginx-transcoder/nginx-no-ssl.conf b/nginx-transcoder/nginx-no-ssl.conf
index 04cf802..9e67443 100644
--- a/nginx-transcoder/nginx-no-ssl.conf
+++ b/nginx-transcoder/nginx-no-ssl.conf
@@ -13,6 +13,10 @@ rtmp {
         listen ${RTMP_PORT};
         chunk_size 4000;
         notify_method get;
+        # 4K (and larger) H.264 keyframes can exceed nginx-rtmp's 1 MB default
+        # max_message, which drops the publish with "too big message" before
+        # ffmpeg ever sees a frame. Raise it well above a realistic keyframe size.
+        max_message 10M;
 
         application live {
             live on;
diff --git a/nginx-transcoder/nginx.conf b/nginx-transcoder/nginx.conf
index 95116a4..45eea1f 100644
--- a/nginx-transcoder/nginx.conf
+++ b/nginx-transcoder/nginx.conf
@@ -13,6 +13,10 @@ rtmp {
         listen ${RTMP_PORT};
         chunk_size 4000;
         notify_method get;
+        # 4K (and larger) H.264 keyframes can exceed nginx-rtmp's 1 MB default
+        # max_message, which drops the publish with "too big message" before
+        # ffmpeg ever sees a frame. Raise it well above a realistic keyframe size.
+        max_message 10M;
 
         application live {
             live on;