diff --git a/docs/plugins/gst_plugins_cache.json b/docs/plugins/gst_plugins_cache.json
index 93ada7fb..858079e2 100644
--- a/docs/plugins/gst_plugins_cache.json
+++ b/docs/plugins/gst_plugins_cache.json
@@ -7962,6 +7962,26 @@
                         "caps": "video/x-raw(ANY):\n",
                         "direction": "src",
                         "presence": "always"
+                    },
+                    "unsynced_src": {
+                        "caps": "application/x-json:\n",
+                        "direction": "src",
+                        "presence": "sometimes"
+                    },
+                    "unsynced_src_%%u": {
+                        "caps": "application/x-json:\n",
+                        "direction": "src",
+                        "presence": "sometimes"
+                    },
+                    "unsynced_translate_src_%%u": {
+                        "caps": "application/x-json:\n",
+                        "direction": "src",
+                        "presence": "sometimes"
+                    },
+                    "unsynced_translate_src_%%u_%%u": {
+                        "caps": "application/x-json:\n",
+                        "direction": "src",
+                        "presence": "sometimes"
                     }
                 },
                 "properties": {
diff --git a/video/closedcaption/src/transcriberbin/imp.rs b/video/closedcaption/src/transcriberbin/imp.rs
index 5cc8baa6..49c21b72 100644
--- a/video/closedcaption/src/transcriberbin/imp.rs
+++ b/video/closedcaption/src/transcriberbin/imp.rs
@@ -1904,6 +1904,36 @@ impl ElementImpl for TranscriberBin {
             )
             .unwrap();
 
+            let src_caps = gst::Caps::builder("application/x-json").build();
+            let unsynced_src_pad_template = gst::PadTemplate::new(
+                "unsynced_src",
+                gst::PadDirection::Src,
+                gst::PadPresence::Sometimes,
+                &src_caps,
+            )
+            .unwrap();
+            let unsynced_translate_src_pad_template = gst::PadTemplate::new(
+                "unsynced_translate_src_%u",
+                gst::PadDirection::Src,
+                gst::PadPresence::Sometimes,
+                &src_caps,
+            )
+            .unwrap();
+            let unsynced_secondary_src_pad_template = gst::PadTemplate::new(
+                "unsynced_src_%u",
+                gst::PadDirection::Src,
+                gst::PadPresence::Sometimes,
+                &src_caps,
+            )
+            .unwrap();
+            let unsynced_secondary_translate_src_pad_template = gst::PadTemplate::new(
+                "unsynced_translate_src_%u_%u",
+                gst::PadDirection::Src,
+                gst::PadPresence::Sometimes,
+                &src_caps,
+            )
+            .unwrap();
+
             vec![
                 video_src_pad_template,
                 video_sink_pad_template,
@@ -1911,6 +1941,10 @@ impl ElementImpl for TranscriberBin {
                 audio_sink_pad_template,
                 secondary_audio_sink_pad_template,
                 secondary_audio_src_pad_template,
+                unsynced_src_pad_template,
+                unsynced_translate_src_pad_template,
+                unsynced_secondary_src_pad_template,
+                unsynced_secondary_translate_src_pad_template,
             ]
         });