diff --git a/README.md b/README.md
index bf63e34..2e27608 100644
--- a/README.md
+++ b/README.md
@@ -10,11 +10,10 @@ video and ImGui rendering; and
 [`go-mxl`](https://github.com/qvest-digital/go-mxl) for MXL access.
 
 > [!IMPORTANT]
-> This project is under active development. Source builds have been verified
-> on current Ubuntu and Fedora environments, and the player has also been
-> tested on a separate Ubuntu machine. macOS builds are in progress; native
-> playback testing and packaging are still pending. Stable releases and MXL
-> Fabrics support are planned.
+> This project is under active development. Builds and feed playback have been
+> verified in current Ubuntu and Fedora environments and on a separate Ubuntu
+> machine. macOS builds are in progress; native playback testing and packaging
+> are still pending. Stable releases and MXL Fabrics support are planned.
 
 ## Features
 
@@ -64,9 +63,9 @@ Verified source-build environments:
 
 | Environment | Result | Required distribution packages |
 |---|---|---|
-| Ubuntu (`ubuntu:latest`, Distrobox) | Build successful | `golang`, `libsdl3-dev`, `spdlog-dev` |
-| Fedora (`fedora:latest`, Distrobox) | Build successful | `golang`, `SDL3-devel`, `spdlog-devel`, `g++` |
-| Ubuntu, separate physical machine | Build and player testing completed | SDL3, compiler toolchain, and a compatible libmxl installation |
+| Ubuntu (`ubuntu:latest`, Distrobox) | Build and feed playback successful | `golang`, `libsdl3-dev`, `spdlog-dev` |
+| Fedora (`fedora:latest`, Distrobox) | Build and feed playback successful | `golang`, `SDL3-devel`, `spdlog-devel`, `g++` |
+| Ubuntu, separate physical machine | Build and feed playback successful | SDL3, compiler toolchain, and a compatible libmxl installation |
 
 These checks used an existing shared libmxl installation with
 `PKG_CONFIG_PATH` pointing to a valid `libmxl.pc`. Package names can differ
@@ -452,8 +451,8 @@ local MXL flow; it will not be implemented as a separate playback backend. See
 
 ## Known limitations
 
-- Linux builds have been verified on Ubuntu and Fedora; broader runtime and
-  hardware coverage is still limited.
+- Linux builds and feed playback have been verified on Ubuntu and Fedora;
+  broader runtime and hardware coverage is still limited.
 - macOS/MoltenVK support is not yet release-tested.
 - Windows support is not currently claimed.
 - GPU selection and verbose logging flags are incomplete.
diff --git a/cmd/mxl-player/main.go b/cmd/mxl-player/main.go
index 3dddb5f..e9acba2 100644
--- a/cmd/mxl-player/main.go
+++ b/cmd/mxl-player/main.go
@@ -502,7 +502,7 @@ func main() {
 	// ImGui
 	var (
 		statsWindowWidth    float32 = 460
-		statsWindowHeight   float32 = 510
+		statsWindowHeight   float32 = 550
 		settingWindowWidth  float32 = 700
 		settingsWindowState bool    = true
 	)
diff --git a/docker/gst-tools/Dockerfile b/docker/gst-tools/Dockerfile
new file mode 100644
index 0000000..2aa68db
--- /dev/null
+++ b/docker/gst-tools/Dockerfile
@@ -0,0 +1,39 @@
+FROM debian:trixie-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        gstreamer1.0-x \
+        gstreamer1.0-tools \
+        gstreamer1.0-plugins-base \
+        gstreamer1.0-plugins-good \
+        gstreamer1.0-plugins-bad \
+        gstreamer1.0-libav \
+        libgstreamer1.0-0 \
+        libgstreamer-plugins-base1.0-0 \
+        libstdc++6 \
+        fontconfig \
+        fonts-dejavu-core \
+    && fc-cache -f \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY build/Linux-GCC-Release /mxl
+
+RUN cp -a /mxl/lib/libmxl.so* /usr/local/lib/ \
+    && ldconfig \
+    && install -m 0755 \
+        /mxl/tools/mxl-gst/mxl-gst-testsrc \
+        /mxl/tools/mxl-gst/mxl-gst-looping-filesrc \
+        /usr/local/bin/ \
+    && mkdir -p /flow-configs /dev/shm/mxl \
+    && cp -a /mxl/lib/tests/data/. /flow-configs/ \
+    && useradd --uid 1000 --create-home --shell /usr/sbin/nologin mxl \
+    && mkdir -p /home/mxl/.cache/fontconfig \
+    && chown -R mxl:mxl /home/mxl /dev/shm/mxl
+
+ENV HOME=/home/mxl \
+    XDG_CACHE_HOME=/home/mxl/.cache
+
+USER mxl
+WORKDIR /flow-configs
+
+CMD ["mxl-gst-testsrc", "--help"]
diff --git a/docker/gst-tools/readme.md b/docker/gst-tools/readme.md
new file mode 100644
index 0000000..f358c2c
--- /dev/null
+++ b/docker/gst-tools/readme.md
@@ -0,0 +1,4 @@
+## build
+docker build --no-cache -f ./docker/gst-tools/Dockerfile -t mxl-gst-tools ~/extra/mxl/
+## run
+docker run --rm -it --mount type=bind,src=/dev/shm/mxl-2,dst=/dev/shm/mxl mxl-gst-tools mxl-gst-testsrc -d /dev/shm/mxl -v /flow-configs/v210_flow.json -a /flow-configs/audio_flow.json
diff --git a/imgui.ini b/imgui.ini
index d5537ee..302a6c8 100644
--- a/imgui.ini
+++ b/imgui.ini
@@ -9,7 +9,7 @@ Size=700,720
 Collapsed=0
 
 [Window][Stats]
-Pos=1460,0
-Size=460,510
+Pos=820,0
+Size=460,550
 Collapsed=0