diff --git a/vite-embedded.config.ts b/vite-embedded.config.ts
index 3bb19436..a5f82af9 100644
--- a/vite-embedded.config.ts
+++ b/vite-embedded.config.ts
@@ -31,7 +31,9 @@ export default defineConfig((env) =>
                 delayed_leave_event_delay_ms: 18000,
               },
               media_quality: {
-                video_codec: "vp9",
+                // video_codec intentionally left unset (defaults to vp8) - setting it
+                // to "vp9" broke calls entirely in production (2026-07-28, no audio/video
+                // transmitted). Root cause not confirmed; revisit once isolated.
                 video: {
                   max_resolution: 1440,
                   max_bitrate: 8_000_000,