diff --git a/modules/videoio/src/cap_avfoundation.mm b/modules/videoio/src/cap_avfoundation.mm
index 4f74ddfaab..aa7ee57142 100644
--- a/modules/videoio/src/cap_avfoundation.mm
+++ b/modules/videoio/src/cap_avfoundation.mm
@@ -1104,9 +1104,19 @@ bool CvCaptureFile::setProperty(int property_id, double value) {
             t.value = value * t.timescale / 1000;
             retval = setupReadingAt(t);
             break;
-        case cv::CAP_PROP_POS_FRAMES:
-            retval = mAssetTrack.nominalFrameRate > 0 ? setupReadingAt(CMTimeMake(value, mAssetTrack.nominalFrameRate)) : false;
+        case cv::CAP_PROP_POS_FRAMES: {
+            // Build the seek CMTime from the track's native rational frame
+            // duration so non-integer rates (e.g. 23.976 = 24000/1001) are exact.
+            CMTime frameDuration = mAssetTrack.minFrameDuration;
+            if (frameDuration.timescale > 0 && frameDuration.value > 0) {
+                retval = setupReadingAt(CMTimeMultiply(frameDuration, (int32_t)value));
+            } else if (mAssetTrack.nominalFrameRate > 0) {
+                retval = setupReadingAt(CMTimeMake(value, mAssetTrack.nominalFrameRate));
+            } else {
+                retval = false;
+            }
             break;
+        }
         case cv::CAP_PROP_POS_AVI_RATIO:
             t = mAsset.duration;
             t.value = round(t.value * value);
@@ -1349,4 +1359,4 @@ void CvVideoWriter_AVFoundation::write(cv::InputArray image) {
     }
 }
 
-#pragma clang diagnostic pop
\ No newline at end of file
+#pragma clang diagnostic pop
diff --git a/modules/videoio/src/cap_avfoundation_mac.mm b/modules/videoio/src/cap_avfoundation_mac.mm
index 5ba1c01c60..3bcd0928de 100644
--- a/modules/videoio/src/cap_avfoundation_mac.mm
+++ b/modules/videoio/src/cap_avfoundation_mac.mm
@@ -1033,9 +1033,19 @@ bool CvCaptureFile::setProperty_(int property_id, double value) {
             t.value = value * t.timescale / 1000;
             retval = setupReadingAt(t);
             break;
-        case cv::CAP_PROP_POS_FRAMES:
-            retval = mAssetTrack.nominalFrameRate > 0 ? setupReadingAt(CMTimeMake(value, mAssetTrack.nominalFrameRate)) : false;
+        case cv::CAP_PROP_POS_FRAMES: {
+            // Build the seek CMTime from the track's native rational frame
+            // duration so non-integer rates (e.g. 23.976 = 24000/1001) are exact.
+            CMTime frameDuration = mAssetTrack.minFrameDuration;
+            if (frameDuration.timescale > 0 && frameDuration.value > 0) {
+                retval = setupReadingAt(CMTimeMultiply(frameDuration, (int32_t)value));
+            } else if (mAssetTrack.nominalFrameRate > 0) {
+                retval = setupReadingAt(CMTimeMake(value, mAssetTrack.nominalFrameRate));
+            } else {
+                retval = false;
+            }
             break;
+        }
         case cv::CAP_PROP_POS_AVI_RATIO:
             t = mAsset.duration;
             t.value = round(t.value * value);
diff --git a/modules/videoio/test/test_video_io.cpp b/modules/videoio/test/test_video_io.cpp
index 9c1b5cb209..784b89d600 100644
--- a/modules/videoio/test/test_video_io.cpp
+++ b/modules/videoio/test/test_video_io.cpp
@@ -1238,4 +1238,43 @@ inline static std::string stream_capture_ffmpeg_name_printer(const testing::Test
 
 INSTANTIATE_TEST_CASE_P(videoio, stream_capture_ffmpeg, testing::Values("h264", "h265", "mjpg.avi"), stream_capture_ffmpeg_name_printer);
 
+// Seek by frame index must be accurate on non-integer frame rates.
+typedef testing::TestWithParam<VideoCaptureAPIs> PreciseSeekingTest;
+
+TEST_P(PreciseSeekingTest, seek_nonInteger_fps_frame_accurate)
+{
+    VideoCaptureAPIs apiPref = GetParam();
+    if (!videoio_registry::hasBackend(apiPref))
+        throw SkipTestException(cv::String("Backend is not available/disabled: ") + cv::videoio_registry::getBackendName(apiPref));
+
+    const std::string file = findDataFile("video/sample_23976fps.mp4");
+
+    VideoCapture cap;
+    ASSERT_TRUE(cap.open(file, apiPref))
+        << "AVFoundation could not open " << file;
+
+    const double fps_num = 24000.0;
+    const double fps_den = 1001.0;
+    const double frame_period_ms = fps_den * 1000.0 / fps_num;  // ~41.7083
+    const double tol_ms = frame_period_ms * 0.5;
+
+    const int targets[] = { 0, 1, 24, 50, 99 };
+    for (int N : targets)
+    {
+        ASSERT_TRUE(cap.set(CAP_PROP_POS_FRAMES, N))
+            << "seek to frame " << N << " failed";
+        Mat img;
+        ASSERT_TRUE(cap.read(img))
+            << "read after seek to frame " << N << " failed";
+        const double got_ms    = cap.get(CAP_PROP_POS_MSEC);
+        const double expect_ms = N * frame_period_ms;
+        EXPECT_NEAR(got_ms, expect_ms, tol_ms)
+            << "non-integer fps seek drifted at frame N=" << N;
+    }
+}
+
+VideoCaptureAPIs seekable_backeinds[] = {CAP_FFMPEG, CAP_MSMF, CAP_AVFOUNDATION};
+
+INSTANTIATE_TEST_CASE_P(videoio, PreciseSeekingTest, testing::ValuesIn(seekable_backeinds), safe_capture_name_printer);
+
 } // namespace