diff --git a/dlls/winegstreamer/gst_private.h b/dlls/winegstreamer/gst_private.h
index a72d72bab18..da0f1b103b3 100644
--- a/dlls/winegstreamer/gst_private.h
+++ b/dlls/winegstreamer/gst_private.h
@@ -136,6 +136,7 @@ HRESULT wg_transform_push_quartz(struct wg_transform *transform, struct wg_sampl
         struct wg_sample_queue *queue);
 HRESULT wg_transform_read_mf(struct wg_transform *transform, struct wg_sample *sample,
         struct wg_format *format);
+HRESULT wg_transform_read_quartz(struct wg_transform *transform, struct wg_sample *sample);
 
 HRESULT winegstreamer_stream_handler_create(REFIID riid, void **obj);
 
diff --git a/dlls/winegstreamer/quartz_transform.c b/dlls/winegstreamer/quartz_transform.c
index 5617e904bf7..30cfb7b855b 100644
--- a/dlls/winegstreamer/quartz_transform.c
+++ b/dlls/winegstreamer/quartz_transform.c
@@ -291,8 +291,6 @@ static HRESULT WINAPI transform_sink_receive(struct strmbase_sink *pin, IMediaSa
 {
     struct transform *filter = impl_from_strmbase_filter(pin->pin.filter);
     struct wg_sample *wg_sample;
-    REFERENCE_TIME start_time;
-    REFERENCE_TIME end_time;
     HRESULT hr;
 
     /* We do not expect pin connection state to change while the filter is
@@ -334,10 +332,11 @@ static HRESULT WINAPI transform_sink_receive(struct strmbase_sink *pin, IMediaSa
             return hr;
         }
 
-        hr = wg_transform_read_data(filter->transform, wg_sample, NULL);
+        hr = wg_transform_read_quartz(filter->transform, wg_sample);
+        wg_sample_release(wg_sample);
+
         if (hr == MF_E_TRANSFORM_NEED_MORE_INPUT)
         {
-            wg_sample_release(wg_sample);
             IMediaSample_Release(output_sample);
             break;
         }
@@ -345,36 +344,12 @@ static HRESULT WINAPI transform_sink_receive(struct strmbase_sink *pin, IMediaSa
         {
             if (hr == MF_E_TRANSFORM_STREAM_CHANGE)
                 FIXME("Unexpected stream format change!\n");
-            wg_sample_release(wg_sample);
             IMediaSample_Release(output_sample);
             return hr;
         }
 
         wg_sample_queue_flush(filter->sample_queue, false);
 
-        hr = IMediaSample_SetActualDataLength(output_sample, wg_sample->size);
-        if (FAILED(hr))
-        {
-            wg_sample_release(wg_sample);
-            IMediaSample_Release(output_sample);
-            return hr;
-        }
-
-        if (wg_sample->flags & WG_SAMPLE_FLAG_HAS_PTS)
-        {
-            start_time = wg_sample->pts;
-            if (wg_sample->flags & WG_SAMPLE_FLAG_HAS_DURATION)
-            {
-                end_time = start_time + wg_sample->duration;
-                IMediaSample_SetTime(output_sample, &start_time, &end_time);
-            }
-            else
-            {
-                IMediaSample_SetTime(output_sample, &start_time, NULL);
-            }
-        }
-        wg_sample_release(wg_sample);
-
         hr = IMemInputPin_Receive(filter->source.pMemInputPin, output_sample);
         if (FAILED(hr))
         {
diff --git a/dlls/winegstreamer/wg_sample.c b/dlls/winegstreamer/wg_sample.c
index cd17b88cdd3..47892b71796 100644
--- a/dlls/winegstreamer/wg_sample.c
+++ b/dlls/winegstreamer/wg_sample.c
@@ -329,3 +329,38 @@ HRESULT wg_transform_push_quartz(struct wg_transform *transform, struct wg_sampl
 
     return hr;
 }
+
+HRESULT wg_transform_read_quartz(struct wg_transform *transform, struct wg_sample *wg_sample)
+{
+    struct sample *sample = unsafe_quartz_from_wg_sample(wg_sample);
+    REFERENCE_TIME start_time, end_time;
+    HRESULT hr;
+    BOOL value;
+
+    TRACE_(mfplat)("transform %p, wg_sample %p.\n", transform, wg_sample);
+
+    if (FAILED(hr = wg_transform_read_data(transform, wg_sample, NULL)))
+        return hr;
+
+    if (FAILED(hr = IMediaSample_SetActualDataLength(sample->u.quartz.sample, wg_sample->size)))
+        return hr;
+
+    if (wg_sample->flags & WG_SAMPLE_FLAG_HAS_PTS)
+    {
+        start_time = wg_sample->pts;
+        if (wg_sample->flags & WG_SAMPLE_FLAG_HAS_DURATION)
+        {
+            end_time = start_time + wg_sample->duration;
+            IMediaSample_SetTime(sample->u.quartz.sample, &start_time, &end_time);
+        }
+        else
+        {
+            IMediaSample_SetTime(sample->u.quartz.sample, &start_time, NULL);
+        }
+    }
+
+    value = !!(wg_sample->flags & WG_SAMPLE_FLAG_SYNC_POINT);
+    IMediaSample_SetSyncPoint(sample->u.quartz.sample, value);
+
+    return S_OK;
+}