diff --git a/streamer/src/ffmpeg.ts b/streamer/src/ffmpeg.ts
index 2dfc76a..9aab7a7 100644
--- a/streamer/src/ffmpeg.ts
+++ b/streamer/src/ffmpeg.ts
@@ -19,7 +19,8 @@ export class Ffmpeg extends EventEmitter {
   start(): { videoIn: Writable; audioIn: Writable } {
     const args = [
       "-loglevel", "warning",
-      // video in (mjpeg pipe on fd 3) — yuvj420p source, large queue for stable pacing
+      // video in (mjpeg pipe on fd 3) — declare full-range to silence swscaler
+      "-color_range", "jpeg",
       "-f", "image2pipe", "-c:v", "mjpeg",
       "-thread_queue_size", "1024",
       "-r", String(this.opts.framerate), "-i", "pipe:3",