diff --git a/.github/nightly-notes/2026-11-07-fix-stats-viewport.md b/.github/nightly-notes/2026-11-07-fix-stats-viewport.md
new file mode 100644
index 000000000..d5e76ed92
--- /dev/null
+++ b/.github/nightly-notes/2026-11-07-fix-stats-viewport.md
@@ -0,0 +1,2 @@
+## Fixed
+- Stats for nerds now shows the real size of the video window instead of -1x-1
diff --git a/app/src/main/java/io/github/aedev/flow/player/EnhancedPlayerManager.kt b/app/src/main/java/io/github/aedev/flow/player/EnhancedPlayerManager.kt
index dbbc44ad9..e9683dda1 100644
--- a/app/src/main/java/io/github/aedev/flow/player/EnhancedPlayerManager.kt
+++ b/app/src/main/java/io/github/aedev/flow/player/EnhancedPlayerManager.kt
@@ -2693,6 +2693,7 @@ class EnhancedPlayerManager private constructor() {
             bandwidthBitsPerSecond = bandwidthMeter?.bitrateEstimate ?: 0L,
             decoderName = analyticsLogger?.activeDecoderName,
             gainDb = audioFeaturesManager?.appliedLoudnessDb,
+            surfaceFrame = surfaceManager?.getSurfaceHolder()?.surfaceFrame,
         )
 
     fun getCastVideoStreams(): List<VideoStream> = availableVideoStreams
diff --git a/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsReader.kt b/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsReader.kt
index c8632e8b6..dc5e4e457 100644
--- a/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsReader.kt
+++ b/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsReader.kt
@@ -1,7 +1,9 @@
 package io.github.aedev.flow.player.stats
 
+import android.graphics.Rect
 import android.os.Build
 import androidx.media3.common.Format
+import androidx.media3.common.util.Size
 import androidx.media3.common.util.UnstableApi
 import androidx.media3.exoplayer.ExoPlayer
 
@@ -10,6 +12,7 @@ internal data class PlayerStatsReadings(
     val bandwidthBitsPerSecond: Long,
     val decoderName: String?,
     val gainDb: Float?,
+    val surfaceFrame: Rect?,
 )
 
 @UnstableApi
@@ -24,7 +27,8 @@ internal object PlayerStatsReader {
         client: String?,
     ): PlayerStatsSnapshot {
         val counters = player.videoDecoderCounters?.also { it.ensureUpdated() }
-        val surface = player.surfaceSize
+        // The player can't measure a bare Surface and reports -1, so a SurfaceView's own frame comes first.
+        val viewport = readings.surfaceFrame?.let { Size(it.width(), it.height()) } ?: player.surfaceSize
         return PlayerStatsSnapshot(
             device = device,
             videoId = videoId,
@@ -43,8 +47,8 @@ internal object PlayerStatsReader {
             gainDb = readings.gainDb,
             bandwidthBitsPerSecond = readings.bandwidthBitsPerSecond,
             bufferedMs = player.totalBufferedDuration,
-            viewportWidth = surface.width,
-            viewportHeight = surface.height,
+            viewportWidth = viewport.width,
+            viewportHeight = viewport.height,
             droppedFrames = counters?.droppedBufferCount ?: 0,
             renderedFrames = counters?.renderedOutputBufferCount ?: 0,
         )
diff --git a/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsSnapshot.kt b/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsSnapshot.kt
index e7d54881b..a61c514f1 100644
--- a/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsSnapshot.kt
+++ b/app/src/main/java/io/github/aedev/flow/player/stats/PlayerStatsSnapshot.kt
@@ -67,10 +67,17 @@ internal object PlayerStatsFormatter {
             PlayerStatLine(R.string.stats_volume, volume(snapshot)),
             PlayerStatLine(R.string.stats_bandwidth, bandwidth(snapshot.bandwidthBitsPerSecond)),
             PlayerStatLine(R.string.stats_buffered, String.format(Locale.US, "%.1f s", snapshot.bufferedMs / MS_PER_SECOND)),
-            PlayerStatLine(R.string.stats_viewport, "${snapshot.viewportWidth}x${snapshot.viewportHeight}"),
+            PlayerStatLine(R.string.stats_viewport, viewport(snapshot)),
             PlayerStatLine(R.string.stats_dropped_frames, "${snapshot.droppedFrames} / ${snapshot.renderedFrames}"),
         )
 
+    private fun viewport(snapshot: PlayerStatsSnapshot): String =
+        if (snapshot.viewportWidth > 0 && snapshot.viewportHeight > 0) {
+            "${snapshot.viewportWidth}x${snapshot.viewportHeight}"
+        } else {
+            UNKNOWN
+        }
+
     private fun videoId(snapshot: PlayerStatsSnapshot): String =
         listOfNotNull(snapshot.videoId, "[${snapshot.kind}]", snapshot.client).joinToString(" ")
 
diff --git a/app/src/test/java/io/github/aedev/flow/player/stats/PlayerStatsFormatterTest.kt b/app/src/test/java/io/github/aedev/flow/player/stats/PlayerStatsFormatterTest.kt
index 2d83c3680..92c724661 100644
--- a/app/src/test/java/io/github/aedev/flow/player/stats/PlayerStatsFormatterTest.kt
+++ b/app/src/test/java/io/github/aedev/flow/player/stats/PlayerStatsFormatterTest.kt
@@ -41,6 +41,13 @@ class PlayerStatsFormatterTest {
         assertThat(value(full, R.string.stats_dropped_frames)).isEqualTo("18 / 4469")
     }
 
+    @Test
+    fun `a viewport the player could not measure reads as unknown`() {
+        val unmeasured = full.copy(viewportWidth = -1, viewportHeight = -1)
+
+        assertThat(value(unmeasured, R.string.stats_viewport)).isEqualTo("-")
+    }
+
     @Test
     fun `a slow connection reads in kbps`() {
         assertThat(value(full.copy(bandwidthBitsPerSecond = 640_000L), R.string.stats_bandwidth)).isEqualTo("640 kbps")