Fix render worker reuse and stabilize out-of-process video rendering

app/node/generator/solid/solid.cpp

@@ -66,6 +66,10 @@ void SolidGenerator::Value(const NodeValueRow &value,
 						   const NodeGlobals &globals,
 						   NodeValueTable *table) const
 {
+	Color c = value[kColorInput].toColor();
+	fprintf(stderr,
+			"SolidGenerator::Value color=%f %f %f %f\n",
+			c.red(), c.green(), c.blue(), c.alpha());
 	table->Push(NodeValue::kTexture,
 				Texture::Job(globals.vparams(), ShaderJob(value)), this);
 }