diff --git a/src/video/actors.rs b/src/video/actors.rs
index 7a22a5a..e45c77e 100644
--- a/src/video/actors.rs
+++ b/src/video/actors.rs
@@ -652,6 +652,10 @@ impl Handler<GeneratePlaylistMessage> for PlaylistGenerator {
                     cmd.arg("-rc").arg("vbr");
                     cmd.arg("-cq").arg("23");
                     cmd.arg("-pix_fmt").arg("yuv420p");
+                    // Without this NVENC turns -force_key_frames into plain
+                    // I-frames, which the HLS muxer can't split on: segments
+                    // fall back to NVENC's 250-frame GOP (8.34 s at 29.97).
+                    cmd.arg("-forced-idr").arg("1");
                 } else {
                     cmd.arg("-c:v").arg("h264");
                     cmd.arg("-crf").arg("21");