jpietek · Oct 9, 2026 · Oct 9, 2026
diff --git a/.github/pages/README.md b/.github/pages/README.md
@@ -6,6 +6,7 @@ screenshots and captured reports there; the code branch links to the
 
 Large recordings and graph images are release assets:
 
+- [Current mixer media](https://github.com/amagimedia/avplumber/releases/tag/mixer-demo-media-2026-10)
 - [Replay media](https://github.com/amagimedia/avplumber/releases/tag/replay-demo-media-2026-09)
 - [DMA-BUF media](https://github.com/amagimedia/avplumber/releases/tag/dmabuf-demo-media-2026-09)
 
@@ -19,3 +20,9 @@ GPU correctness tests, capacity measurements and actual deployment state.
 Keep historical measurements attached to their workload and revision; a code
 review or small smoke test does not refresh a capacity benchmark. Publish
 sanitized textual evidence without private host or storage paths.
+
+The October mixer demo is a 10-second recording of the real main UI, with
+Program/Preview and dirty Program viewers, four keys and direct cuts. Its
+`capture-20261009.json` describes the observed 192-input L4 configuration;
+it does not replace historical capacity or latency measurements. September
+mixer graph images and recordings remain historical release assets.
diff --git a/demos/mixer/README.md b/demos/mixer/README.md
@@ -3,10 +3,20 @@
 Mix video and browser sources on a CUDA canvas, with Preview/Program,
 Cut/Fade/media wipes, downstream keys and AUX monitors. Video only.
 
-[Watch the demo](https://amagimedia.github.io/avplumber/demos/mixer/docs/) ·
+[![192-input mixer: Program/Preview and dirty Program with four downstream keys](https://amagimedia.github.io/avplumber/demos/mixer/docs/mixer-demo-poster.jpg)](https://amagimedia.github.io/avplumber/demos/mixer/docs/)
+
+[Watch the 10-second demo](https://amagimedia.github.io/avplumber/demos/mixer/docs/) ·
+[MP4](https://github.com/amagimedia/avplumber/releases/download/mixer-demo-media-2026-10/mixer-192-input-demo.mp4) ·
 [HTML cookbook](https://amagimedia.github.io/avplumber/demos/mixer/docs/cookbook/) ·
 [Configuration](docs/config.md) · [Run manually](docs/guide.md)
 
+Recorded 2026-10-09 from the real two-viewer interface on an NVIDIA L4:
+192 inputs (120 NVDEC, 36 browser scene sources, 32 raw NV12 and four browser
+keys), 256 scenes and 26 encoded outputs at 1920×1080p25 SDR. It shows direct
+cuts with all four keys enabled. Setup counts the 188 scene sources separately
+from the keys. This short recording demonstrates the interface; see
+[capacity measurements](docs/capacity.md) for qualification scope.
+
 ## Run
 
 Use a Linux NVIDIA host with NVDEC/NVENC, Docker Compose, NVIDIA Container

diff --git a/demos/mixer/docs/capacity.md b/demos/mixer/docs/capacity.md
@@ -8,6 +8,21 @@ runs; raw evidence and caveats remain linked below.
 [Source-limit cookbook](https://amagimedia.github.io/avplumber/demos/mixer/docs/cookbook/source-limits.html) ·
 [HTML cookbook](https://amagimedia.github.io/avplumber/demos/mixer/docs/cookbook/)
 
+## Current demo recording: 2026-10-09
+
+The [10-second UI recording](https://amagimedia.github.io/avplumber/demos/mixer/docs/)
+shows a running `nvidia_l4_cuarray` show on one NVIDIA L4 / 16-vCPU host:
+192 inputs, 256 scenes and 26 outputs at 1920×1080p25 SDR. The input total is
+120 NVDEC + 36 browser scene sources + 32 raw NV12 + four browser keys;
+Setup reports 188 catalogue sources before adding the keys. Outputs are
+Program, clean Program and 24 AUX buses, including the Program/Preview monitor
+and source multiviewer.
+
+The capture uses two WebRTC viewers, four enabled keys and direct cuts through
+several scene types. It is an interface demonstration, not a new capacity,
+latency or soak benchmark. The [capture metadata](https://amagimedia.github.io/avplumber/demos/mixer/docs/capture-20261009.json)
+records its scope; the historical qualification results below remain separate.
+
 ## T4
 
 16 GiB T4, 16 vCPUs, 1080p inputs; totals include four browser keys.

diff --git a/demos/mixer/docs/guide.md b/demos/mixer/docs/guide.md
@@ -40,6 +40,19 @@ The Compose stack starts the web UI. With a standalone backend:
 python3 -m pyplumber.mixer.gui --host 127.0.0.1 --port 7777 --http-port 7681
 ```
 
+For the [recorded two-viewer layout](https://amagimedia.github.io/avplumber/demos/mixer/docs/),
+select **Viewers 2**, then **Program preview** in one viewer and **Program dirty**
+in the other. The first contains PVW, PGM and eight scene slots; the second
+shows the program with its enabled keys. Viewer selection is local to the
+browser. Scene takes, key buttons, AUX paging and AUX layout controls operate
+the running mixer. In Direct mode, selecting a scene takes it immediately
+using the selected transition; select Cut for the cut-only workflow.
+
+Each viewer must support its output codec. The recorded L4 show uses HEVC for
+Program preview and H.264 for dirty Program; an H.264-capable browser alone
+cannot display both. Setup can change output codecs, but applying Setup
+restarts the mixer. The downloadable demonstration MP4 is H.264.
+
 For the optional terminal UI:
 
 ```sh
@@ -81,7 +94,8 @@ Fedora image); the manual mixer needs no neural models.
 ## Behind a reverse proxy
 
 Serve controls at `/` and the preview server at `/preview/`, stripping that
-prefix. Set `MIXER_PREVIEW_BASE=/preview/` (or `webui.py --preview-base /preview/`).
+prefix. Set `MIXER_PREVIEW_BASE=/preview/` (or pass `--preview-base /preview/`
+to `python3 -m pyplumber.mixer.gui`).
 Forward WebSocket upgrades for the preview's Janus path as well as normal HTTP.
 The [L4 proxy template](../../../docker-compose/mixer/deploy/l4/nginx.conf.template) is a complete example.
 WebRTC also needs the configured UDP range reachable from the viewer.

diff --git a/docker-compose/mixer/deploy/l4/README.md b/docker-compose/mixer/deploy/l4/README.md
@@ -1,6 +1,6 @@
 # Portable L4 mixer
 
-[Quick start](../../../../demos/mixer/README.md) · [Capacity](../../../../demos/mixer/docs/capacity.md#nvidia-l4-nvidia_l4) ·
+[Quick start](../../../../demos/mixer/README.md) · [Capacity](../../../../demos/mixer/docs/capacity.md#nvidia-l4-linear-and-cuarray-profiles) ·
 [HTML cookbook](https://amagimedia.github.io/avplumber/demos/mixer/docs/cookbook/)
 
 Requires a Linux L4 host with working NVIDIA DRM/GBM/EGL, R615+ driver,
@@ -24,6 +24,12 @@ Allow the public proxy port and `JANUS_RTP_PORT_RANGE` (UDP 20000–20100 by
 default). Set `MIXER_HTPASSWD` or use an authenticated reverse proxy.
 The included proxy forwards HTTP and WebSocket paths.
 
+The [current demo recording](https://amagimedia.github.io/avplumber/demos/mixer/docs/)
+shows this profile at 192 inputs / 256 scenes / 26 outputs, 1080p25 SDR.
+Its two viewers show Program/Preview and dirty Program with four keys. The
+Program/Preview and Multiviewer outputs in that show use HEVC; use a browser
+with HEVC WebRTC reception support to view them. The recording itself is H.264.
+
 First start seeds [settings.json](settings.json) and generates media. Later
 starts preserve saved settings; change an existing show through Setup.
 Keep the writable media directory, including `.nv-cache`, across restarts.