diff --git a/nodes/ndiout/main.cpp b/nodes/ndiout/main.cpp
index b46b43e..3c5e1ad 100644
--- a/nodes/ndiout/main.cpp
+++ b/nodes/ndiout/main.cpp
@@ -72,7 +72,7 @@ class NDIOutNode : public dmf::NodeBase {
             const auto audio_flow_id   = audio_flow_info.at("id").get<std::string>();
             sample_rate       = audio_flow_info.value("sample_rate", 48000);
             channels          = audio_flow_info.value("channels", 2);
-            samples_per_frame = sample_rate / fps_num;
+            samples_per_frame = sample_rate * fps_den / fps_num;
 
             log("audio flow=%s  %d Hz  %dch  %d samples/frame",
                 audio_flow_id.c_str(), sample_rate, channels, samples_per_frame);