deploy: add run.sh launch wrapper with GST_PLUGIN_PATH+LD_PRELOAD for R36S

On linux-aarch64 the conda gst-libav package has an unfixable ABI mismatch
(libdav1d.so.6 missing, libicuuc.so.78 via libxml2-16). Fix: use system
gstreamer1.0-libav installed via apt with GST_PLUGIN_PATH, and preload
system libgomp.so.1 to avoid static TLS block errors when dlopen loads
libgstlibav.so. avdec_h264 and avdec_aac now register correctly on device.

These vars are stored in conda activate.d/gst-env.sh and in deploy/run.sh.

deploy/run.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Launch wrapper for r36s-dlna-browser on ArkOS / R36S
+# Requires: conda env r36s-dlna-browser, system gstreamer1.0-libav installed via apt.
+#
+# System plugin path makes avdec_h264/aac available (conda gst-libav has broken deps on aarch64).
+# LD_PRELOAD is required to work around "cannot allocate memory in static TLS block" for libgomp.
+export GST_PLUGIN_PATH=/usr/lib/aarch64-linux-gnu/gstreamer-1.0
+export LD_PRELOAD=/usr/lib/aarch64-linux-gnu/libgomp.so.1
+
+CONDA_ENV=/home/ark/miniconda3/envs/r36s-dlna-browser
+exec "$CONDA_ENV/bin/python" -m r36s_dlna_browser "$@"

docs/development-status.md

@@ -67,14 +67,17 @@ Milestone 3 — SDL Video Viewport, HUD, and Wayland Compatibility
 - GStreamer imports now succeed in the dedicated env (`GLib`, `GObject`, `Gst`, `GstApp`, `GstVideo`), and `Application` imports cleanly.
 - ArkOS menu launch works on the physical device, and DLNA browsing reaches real MiniDLNA content.
 - Real playback is currently blocked by missing decoder elements in the device env: direct probing of a MiniDLNA `.mkv` URL showed missing H.264 High Profile and MPEG-4 AAC decoders, while the user-facing "can't play a text file" message is a misleading fallback caused by an additional text stream in the container.
-- Direct package installs on the physical R36S now added `gst-libav`, `gst-plugins-bad`, `ffmpeg`, `libxml2-16`, and several related runtime libraries into `/home/ark/miniconda3/envs/r36s-dlna-browser`; `h264parse` now registers, but `gst-libav` still does not expose `avdec_h264` because `libgstlibav.so` remains blocked by unresolved `dav1d` and `icu` ABI/runtime mismatches on `linux-aarch64`.
-- Some optional GStreamer plugins still warn about additional codec libraries (`libxml2`, `libFLAC`, `libvpx`, `mpg123`) that are not yet installed in the env.
+- **RESOLVED**: `gst-libav` conda package on `linux-aarch64` has an unfixable ABI mismatch: `libavcodec.so` links `libdav1d.so.6` (from dav1d <1.3) but only dav1d 1.4.x (`.so.7`) is available, and via `libxml2-16` it also pulls `libicuuc.so.78` which is not packaged for linux-aarch64 on conda-forge. **Solution**: install system `gstreamer1.0-libav` (v1.16.1) via apt and use `GST_PLUGIN_PATH` + `LD_PRELOAD` to expose its plugins to the conda Python runtime.
+- On the physical R36S, `avdec_h264` and `avdec_aac` now register and resolve when launched with:
+  `LD_PRELOAD=/usr/lib/aarch64-linux-gnu/libgomp.so.1 GST_PLUGIN_PATH=/usr/lib/aarch64-linux-gnu/gstreamer-1.0`
+  The `LD_PRELOAD` is required to avoid "cannot allocate memory in static TLS block" from the conda `libgomp.so` being loaded late by dlopen.
+- These variables are now persisted in `/home/ark/miniconda3/envs/r36s-dlna-browser/etc/conda/activate.d/gst-env.sh` and explicitly set in `deploy/run.sh`.
 
 ## Next Recommended Actions
 
 1. Run a visual playback smoke test and confirm SDL-rendered video plus HUD eliminates flashing on host playback.
 2. Validate the SDL-texture playback path on the target R36S `kmsdrm` backend.
 3. Measure CPU/load on RK3326 hardware during audio and video playback.
-4. If RGBA upload cost is too high, add a follow-up YUV texture upload path using `SDL_UpdateYUVTexture`.
-5. Install matching `gst-libav` and `gst-plugins-bad` packages into `/home/ark/miniconda3/envs/r36s-dlna-browser`, then confirm `avdec_h264`, an AAC decoder, and `h264parse` appear in `gst-inspect-1.0`.
-6. Resolve the remaining `gst-libav` runtime chain on `linux-aarch64` by finding a compatible `ffmpeg`/`dav1d`/`icu` combination or by supplying the missing shared libraries manually, then re-test the real MiniDLNA `.mkv` URL with `gst-launch-1.0` and from ArkOS `Ports -> MatHacks`.
+4. Test real MiniDLNA `.mkv` H.264/AAC media end-to-end from the ArkOS `Ports -> MatHacks` launcher using `deploy/run.sh`.
+5. If RGBA upload cost is too high, add a follow-up YUV texture upload path using `SDL_UpdateYUVTexture`.
+6. `avdec_hevc` is still missing (HEVC decoders not in system apt `gstreamer1.0-libav 1.16.1`); AV1 excluded intentionally as too heavy for RK3326 — this is acceptable for the H.264/AAC primary codec target.