diff --git a/client/Cargo.toml b/client/Cargo.toml
index d66426a..f78576f 100644
--- a/client/Cargo.toml
+++ b/client/Cargo.toml
@@ -4,7 +4,7 @@ path                    = "src/main.rs"
 
 [package]
 name                    = "lesavka_client"
-version                 = "0.11.9"
+version                 = "0.11.10"
 edition                 = "2024"
 
 [dependencies]
diff --git a/client/src/launcher/diagnostics.rs b/client/src/launcher/diagnostics.rs
index e5a0bad..e72c3fd 100644
--- a/client/src/launcher/diagnostics.rs
+++ b/client/src/launcher/diagnostics.rs
@@ -26,6 +26,8 @@ pub struct PerformanceSample {
     pub left_server_queue_peak: u32,
     pub left_server_encoder_label: String,
     pub left_decoder_label: String,
+    pub left_stream_caps_label: String,
+    pub left_decoded_caps_label: String,
     pub right_receive_fps: f32,
     pub right_present_fps: f32,
     pub right_server_fps: f32,
@@ -39,6 +41,8 @@ pub struct PerformanceSample {
     pub right_server_queue_peak: u32,
     pub right_server_encoder_label: String,
     pub right_decoder_label: String,
+    pub right_stream_caps_label: String,
+    pub right_decoded_caps_label: String,
     pub dropped_frames: u64,
     pub queue_depth: u32,
 }
@@ -109,6 +113,8 @@ pub struct SnapshotReport {
     pub left_server_send_gap_peak_ms: f32,
     pub left_server_queue_peak: u32,
     pub left_server_encoder_label: String,
+    pub left_stream_caps_label: String,
+    pub left_decoded_caps_label: String,
     pub right_surface: String,
     pub right_capture_profile: String,
     pub right_capture_transport: String,
@@ -123,6 +129,8 @@ pub struct SnapshotReport {
     pub right_server_send_gap_peak_ms: f32,
     pub right_server_queue_peak: u32,
     pub right_server_encoder_label: String,
+    pub right_stream_caps_label: String,
+    pub right_decoded_caps_label: String,
     pub selected_camera: Option<String>,
     pub selected_microphone: Option<String>,
     pub selected_speaker: Option<String>,
@@ -223,6 +231,24 @@ impl SnapshotReport {
                     }
                 })
                 .unwrap_or_else(|| "pending".to_string()),
+            left_stream_caps_label: latest
+                .map(|sample| {
+                    if sample.left_stream_caps_label.is_empty() {
+                        "pending".to_string()
+                    } else {
+                        sample.left_stream_caps_label.clone()
+                    }
+                })
+                .unwrap_or_else(|| "pending".to_string()),
+            left_decoded_caps_label: latest
+                .map(|sample| {
+                    if sample.left_decoded_caps_label.is_empty() {
+                        "pending".to_string()
+                    } else {
+                        sample.left_decoded_caps_label.clone()
+                    }
+                })
+                .unwrap_or_else(|| "pending".to_string()),
             right_surface: state.display_surface(1).label().to_string(),
             right_capture_profile: format!(
                 "{} | {}x{} | {} fps | {} kbit",
@@ -277,6 +303,24 @@ impl SnapshotReport {
                     }
                 })
                 .unwrap_or_else(|| "pending".to_string()),
+            right_stream_caps_label: latest
+                .map(|sample| {
+                    if sample.right_stream_caps_label.is_empty() {
+                        "pending".to_string()
+                    } else {
+                        sample.right_stream_caps_label.clone()
+                    }
+                })
+                .unwrap_or_else(|| "pending".to_string()),
+            right_decoded_caps_label: latest
+                .map(|sample| {
+                    if sample.right_decoded_caps_label.is_empty() {
+                        "pending".to_string()
+                    } else {
+                        sample.right_decoded_caps_label.clone()
+                    }
+                })
+                .unwrap_or_else(|| "pending".to_string()),
             selected_camera: state.devices.camera.clone(),
             selected_microphone: state.devices.microphone.clone(),
             selected_speaker: state.devices.speaker.clone(),
@@ -333,6 +377,8 @@ impl SnapshotReport {
             self.left_queue_depth,
             self.left_queue_peak
         );
+        let _ = writeln!(text, "  stream caps: {}", self.left_stream_caps_label);
+        let _ = writeln!(text, "  decoded caps: {}", self.left_decoded_caps_label);
         let _ = writeln!(
             text,
             "  server: encoder={} cpu={:.1}% gaps={:.0}/{:.0}ms queue-peak={}",
@@ -357,6 +403,8 @@ impl SnapshotReport {
             self.right_queue_depth,
             self.right_queue_peak
         );
+        let _ = writeln!(text, "  stream caps: {}", self.right_stream_caps_label);
+        let _ = writeln!(text, "  decoded caps: {}", self.right_decoded_caps_label);
         let _ = writeln!(
             text,
             "  server: encoder={} cpu={:.1}% gaps={:.0}/{:.0}ms queue-peak={}",
@@ -657,6 +705,9 @@ mod tests {
             left_server_queue_peak: n as u32 + 1,
             left_server_encoder_label: "x264enc".to_string(),
             left_decoder_label: "decodebin".to_string(),
+            left_stream_caps_label: "video/x-h264, width=(int)1920, height=(int)1080".to_string(),
+            left_decoded_caps_label:
+                "video/x-raw, format=(string)NV12, width=(int)1920, height=(int)1080".to_string(),
             right_receive_fps: 30.0,
             right_present_fps: 28.0,
             right_server_fps: 30.0,
@@ -670,6 +721,9 @@ mod tests {
             right_server_queue_peak: n as u32 + 1,
             right_server_encoder_label: "source-pass-through".to_string(),
             right_decoder_label: "decodebin".to_string(),
+            right_stream_caps_label: "video/x-h264, width=(int)1920, height=(int)1080".to_string(),
+            right_decoded_caps_label:
+                "video/x-raw, format=(string)NV12, width=(int)1920, height=(int)1080".to_string(),
             dropped_frames: n,
             queue_depth: n as u32,
         }
@@ -730,6 +784,8 @@ mod tests {
         assert!(report.left_capture_profile.contains("fps"));
         assert_eq!(report.left_capture_transport, "server re-encode");
         assert_eq!(report.left_decoder_label, "decodebin");
+        assert!(report.left_stream_caps_label.contains("video/x-h264"));
+        assert!(report.left_decoded_caps_label.contains("video/x-raw"));
     }
 
     #[test]
@@ -758,6 +814,8 @@ mod tests {
         assert!(text.contains("left eye"));
         assert!(text.contains("transport:"));
         assert!(text.contains("live: decoder="));
+        assert!(text.contains("stream caps:"));
+        assert!(text.contains("decoded caps:"));
         assert!(text.contains("recommendations"));
     }
 
diff --git a/client/src/launcher/preview.rs b/client/src/launcher/preview.rs
index 0337511..30a40b8 100644
--- a/client/src/launcher/preview.rs
+++ b/client/src/launcher/preview.rs
@@ -5,7 +5,7 @@ use anyhow::{Context, Result};
 #[cfg(not(coverage))]
 use gstreamer as gst;
 #[cfg(not(coverage))]
-use gstreamer::prelude::{Cast, ElementExt, GstBinExt, GstObjectExt};
+use gstreamer::prelude::{Cast, ElementExt, GstBinExt, GstObjectExt, PadExt};
 #[cfg(not(coverage))]
 use gstreamer_app as gst_app;
 #[cfg(not(coverage))]
@@ -90,6 +90,8 @@ pub struct PreviewMetricsSnapshot {
     pub server_queue_peak: u32,
     pub server_encoder_label: String,
     pub decoder_label: String,
+    pub stream_caps_label: String,
+    pub decoded_caps_label: String,
 }
 
 #[cfg(not(coverage))]
@@ -496,6 +498,8 @@ struct PreviewTelemetry {
     latest_server_queue_peak: u32,
     latest_server_encoder_label: String,
     decoder_label: String,
+    stream_caps_label: String,
+    decoded_caps_label: String,
 }
 
 #[cfg(not(coverage))]
@@ -597,6 +601,18 @@ impl PreviewTelemetry {
         }
     }
 
+    fn note_stream_caps(&mut self, caps_label: &str) {
+        if !caps_label.is_empty() {
+            self.stream_caps_label = caps_label.to_string();
+        }
+    }
+
+    fn note_decoded_caps(&mut self, caps_label: &str) {
+        if !caps_label.is_empty() {
+            self.decoded_caps_label = caps_label.to_string();
+        }
+    }
+
     fn snapshot(&mut self) -> PreviewMetricsSnapshot {
         self.snapshot_at(Instant::now())
     }
@@ -640,6 +656,8 @@ impl PreviewTelemetry {
             server_queue_peak: self.latest_server_queue_peak,
             server_encoder_label: self.latest_server_encoder_label.clone(),
             decoder_label: self.decoder_label.clone(),
+            stream_caps_label: self.stream_caps_label.clone(),
+            decoded_caps_label: self.decoded_caps_label.clone(),
         }
     }
 
@@ -810,6 +828,8 @@ fn run_preview_feed(
     log_sink: Arc<Mutex<Option<std::sync::mpsc::Sender<String>>>>,
 ) -> Result<()> {
     let (pipeline, appsrc, appsink, decoder_name) = build_preview_pipeline(profile)?;
+    let parser = pipeline.by_name("preview_parse");
+    let decoder = pipeline.by_name("decoder");
     if let Ok(mut slot) = shared.lock() {
         slot.telemetry.note_decoder(&decoder_name);
     }
@@ -830,6 +850,8 @@ fn run_preview_feed(
     {
         let shared = Arc::clone(&shared);
         let appsink = appsink.clone();
+        let parser = parser.clone();
+        let decoder = decoder.clone();
         let running = Arc::clone(&running);
         std::thread::spawn(move || {
             loop {
@@ -837,6 +859,12 @@ fn run_preview_feed(
                     break;
                 }
                 if let Some(sample) = appsink.try_pull_sample(gst::ClockTime::from_mseconds(250)) {
+                    if let Some(parser) = parser.as_ref() {
+                        record_preview_caps(&shared, parser, "src", PreviewCapsKind::Stream);
+                    }
+                    if let Some(decoder) = decoder.as_ref() {
+                        record_preview_caps(&shared, decoder, "src", PreviewCapsKind::Decoded);
+                    }
                     if let Some(frame) = sample_to_frame(&sample) {
                         if let Ok(mut slot) = shared.lock() {
                             slot.push_frame(frame);
@@ -1225,7 +1253,7 @@ fn build_preview_pipeline(
     let desc = format!(
         "appsrc name=src is-live=true format=time do-timestamp=true block=false ! \
          queue max-size-buffers=6 max-size-time=0 max-size-bytes=0 leaky=downstream ! \
-         h264parse disable-passthrough=true ! {decoder_name} name=decoder ! videoconvert ! videoscale ! \
+         h264parse name=preview_parse disable-passthrough=true ! {decoder_name} name=decoder ! videoconvert ! videoscale ! \
          video/x-raw,format=RGBA,width={},height={},pixel-aspect-ratio=1/1 ! \
          appsink name=sink emit-signals=false sync=false max-buffers=1 drop=true",
         profile.display_width, profile.display_height
@@ -1272,6 +1300,45 @@ fn push_preview_packet(appsrc: &gst_app::AppSrc, pkt: VideoPacket) {
     let _ = appsrc.push_buffer(buf);
 }
 
+#[cfg(not(coverage))]
+#[derive(Clone, Copy)]
+enum PreviewCapsKind {
+    Stream,
+    Decoded,
+}
+
+#[cfg(not(coverage))]
+fn record_preview_caps(
+    shared: &Arc<Mutex<SharedPreviewState>>,
+    element: &gst::Element,
+    pad_name: &str,
+    kind: PreviewCapsKind,
+) {
+    let Some(pad) = element.static_pad(pad_name) else {
+        return;
+    };
+    let Some(caps) = pad.current_caps() else {
+        return;
+    };
+    let caps_label = preview_caps_summary(&caps);
+    if caps_label.is_empty() {
+        return;
+    }
+    if let Ok(mut slot) = shared.lock() {
+        match kind {
+            PreviewCapsKind::Stream => slot.telemetry.note_stream_caps(&caps_label),
+            PreviewCapsKind::Decoded => slot.telemetry.note_decoded_caps(&caps_label),
+        }
+    }
+}
+
+#[cfg(not(coverage))]
+fn preview_caps_summary(caps: &gst::Caps) -> String {
+    caps.structure(0)
+        .map(|structure| structure.to_string())
+        .unwrap_or_else(|| caps.to_string())
+}
+
 #[cfg(not(coverage))]
 fn record_preview_packet(shared: &Arc<Mutex<SharedPreviewState>>, pkt: &VideoPacket) {
     if let Ok(mut slot) = shared.lock() {
diff --git a/client/src/launcher/ui.rs b/client/src/launcher/ui.rs
index 3dab378..3faecd5 100644
--- a/client/src/launcher/ui.rs
+++ b/client/src/launcher/ui.rs
@@ -303,6 +303,8 @@ fn record_diagnostics_sample(
             left_server_queue_peak: left_metrics.server_queue_peak,
             left_server_encoder_label: left_metrics.server_encoder_label.clone(),
             left_decoder_label: left_metrics.decoder_label.clone(),
+            left_stream_caps_label: left_metrics.stream_caps_label.clone(),
+            left_decoded_caps_label: left_metrics.decoded_caps_label.clone(),
             right_receive_fps: right_metrics.receive_fps,
             right_present_fps: right_metrics.present_fps,
             right_server_fps: right_metrics.server_fps,
@@ -316,6 +318,8 @@ fn record_diagnostics_sample(
             right_server_queue_peak: right_metrics.server_queue_peak,
             right_server_encoder_label: right_metrics.server_encoder_label.clone(),
             right_decoder_label: right_metrics.decoder_label.clone(),
+            right_stream_caps_label: right_metrics.stream_caps_label.clone(),
+            right_decoded_caps_label: right_metrics.decoded_caps_label.clone(),
             dropped_frames: left_metrics
                 .dropped_frames
                 .saturating_add(right_metrics.dropped_frames),
diff --git a/common/Cargo.toml b/common/Cargo.toml
index 2710ec0..9b45a12 100644
--- a/common/Cargo.toml
+++ b/common/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name                    = "lesavka_common"
-version                 = "0.11.9"
+version                 = "0.11.10"
 edition                 = "2024"
 build                   = "build.rs"
 
diff --git a/common/src/cli.rs b/common/src/cli.rs
index 25455f4..fa6cc51 100644
--- a/common/src/cli.rs
+++ b/common/src/cli.rs
@@ -17,6 +17,6 @@ mod tests {
 
     #[test]
     fn banner_includes_version() {
-        assert_eq!(banner("0.11.9"), "lesavka-common CLI (v0.11.9)");
+        assert_eq!(banner("0.11.10"), "lesavka-common CLI (v0.11.10)");
     }
 }
diff --git a/server/Cargo.toml b/server/Cargo.toml
index debde42..5a0b476 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -10,7 +10,7 @@ bench                   = false
 
 [package]
 name                    = "lesavka_server"
-version                 = "0.11.9"
+version                 = "0.11.10"
 edition                 = "2024"
 autobins                = false