feat(rdp): add PipeWire frame rate optimization for software encoding

Reduce video capture frame rate from 25fps to 15fps via PipeWire config.
This helps reduce CPU load when VA-API hardware encoding is unavailable
(e.g., VirGL VMs where VirGL doesn't expose H.264 encoding).

For dev workloads (VSCode, terminals, web browsing), 15fps is sufficient
and reduces encoding overhead. Users can adjust to 20-25fps if scrolling
feels choppy.

Config deployed to /etc/pipewire/pipewire.conf.d/99-rdp-optimize.conf

Author: Derek

ansible/roles/dfe_rdp/tasks/dconf.yml

@@ -30,9 +30,48 @@
     - ansible_facts['distribution'] in ['Fedora', 'Ubuntu']
     - dfe_has_gnome
 
+# ============================================================================
+# PIPEWIRE VIDEO FRAME RATE OPTIMIZATION
+# ============================================================================
+# Reduce video capture frame rate to lower CPU encoding load for software H.264
+# This helps when VA-API hardware encoding is not available (e.g., VirGL VMs)
+# Default PipeWire video rate is 25fps, we reduce to 15fps for dev workloads
+# (text editing, terminals, web browsing don't need high frame rates)
+
+- name: Create PipeWire config directory
+  ansible.builtin.file:
+    path: /etc/pipewire/pipewire.conf.d
+    state: directory
+    mode: '0755'
+  when:
+    - ansible_facts['distribution'] in ['Fedora', 'Ubuntu']
+    - dfe_has_gnome
+
+- name: Deploy PipeWire RDP optimization config
+  ansible.builtin.copy:
+    dest: /etc/pipewire/pipewire.conf.d/99-rdp-optimize.conf
+    mode: '0644'
+    content: |
+      # DFE RDP Optimization - Reduce video frame rate
+      # Lower frame rate = less CPU encoding load for software H.264
+      # Good for dev work (VSCode, terminals) - text doesn't need 60fps
+      # Change default.video.rate.num to 20 or 25 if scrolling feels choppy
+      context.properties = {
+          default.video.rate.num = 15
+          default.video.rate.denom = 1
+      }
+  register: pipewire_rdp_config
+  when:
+    - ansible_facts['distribution'] in ['Fedora', 'Ubuntu']
+    - dfe_has_gnome
+
 - name: Display dconf status
   ansible.builtin.debug:
-    msg: "GNOME Remote Desktop configured via grdctl (system service mode) - animations disabled for RDP performance"
+    msg: |
+      GNOME Remote Desktop optimizations applied:
+      - Animations disabled for RDP performance
+      - PipeWire video rate reduced to 15fps (saves CPU on software H.264 encoding)
+      - Reconnect RDP session for frame rate change to take effect
   when:
     - ansible_facts['distribution'] in ['Fedora', 'Ubuntu']
     - dfe_has_gnome