escape characters in text filter

ffplayout-engine/src/rpc/mod.rs

@@ -35,7 +35,16 @@ struct TextFilter {
 
 impl fmt::Display for TextFilter {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let mut s = format!("text='{}'", self.text.clone().unwrap_or_default());
+        let escaped_text = self
+            .text
+            .clone()
+            .unwrap_or_default()
+            .replace('\'', "'\\\\\\''")
+            .replace('\\', "\\\\\\\\")
+            .replace('%', "\\\\\\%")
+            .replace(':', "\\:");
+
+        let mut s = format!("text='{escaped_text}'");
 
         if let Some(v) = &self.x {
             if !v.is_empty() {

lib/src/filter/v_drawtext.rs

@@ -40,11 +40,11 @@ pub fn filter_node(
                 .to_string(),
         };
 
-        let escape = text
+        let escaped_text = text
             .replace('\'', "'\\\\\\''")
             .replace('%', "\\\\\\%")
             .replace(':', "\\:");
-        filter = format!("drawtext=text='{escape}':{}{font}", config.text.style)
+        filter = format!("drawtext=text='{escaped_text}':{}{font}", config.text.style)
     } else if let Some(socket) = zmq_socket {
         let mut filter_cmd = format!("text=''{font}");