--- /dev/null
+++ b/0001-reset-output-on-idle.patch
@@ -0,0 +1,37 @@
+--- src/v4l2-relayd.c.orig	2026-03-30 09:59:14.804751921 -0700
++++ src/v4l2-relayd.c	2026-03-30 09:59:14.827617699 -0700
+@@ -58,6 +58,7 @@
+ static GstElement *input_pipeline = NULL;
+ static GstElement *output_pipeline = NULL;
+ static GstElement *splash_pipeline = NULL;
++static GTimer *input_timer = NULL;
+ 
+ static gboolean    backend_pipeline_bus_call (GstBus      *bus,
+                                               GstMessage  *msg,
+@@ -278,6 +279,10 @@
+ {
+   gst_element_set_state (splash_pipeline_get (), GST_STATE_NULL);
+   gst_element_set_state (input_pipeline_get (), GST_STATE_PLAYING);
++  if (input_timer == NULL)
++    input_timer = g_timer_new ();
++  else
++    g_timer_start (input_timer);
+ }
+ 
+ static void
+@@ -285,6 +290,15 @@
+ {
+   if (input_pipeline != NULL)
+     gst_element_set_state (input_pipeline, GST_STATE_NULL);
++  /* After a real streaming session (>3s), reset the output pipeline
++   * to clear stale v4l2loopback state that causes format negotiation
++   * failures when switching between camera apps.  Brief probes from
++   * PipeWire/WirePlumber (<1s) are skipped. */
++  if (input_timer != NULL && g_timer_elapsed (input_timer, NULL) > 3.0
++      && output_pipeline != NULL) {
++    gst_element_set_state (output_pipeline, GST_STATE_READY);
++    gst_element_set_state (output_pipeline, GST_STATE_PLAYING);
++  }
+   if (input_pipeline != NULL)
+     gst_element_set_state (splash_pipeline, GST_STATE_PLAYING);
+ }