diff --git a/media/gpu/windows/d3d12_video_encode_accelerator.cc b/media/gpu/windows/d3d12_video_encode_accelerator.cc
--- a/media/gpu/windows/d3d12_video_encode_accelerator.cc
+++ b/media/gpu/windows/d3d12_video_encode_accelerator.cc
@@ -412,6 +412,15 @@
 D3D12VideoEncodeAccelerator::~D3D12VideoEncodeAccelerator() {
   VLOGF(2);
   DCHECK_CALLED_ON_VALID_SEQUENCE(encoder_sequence_checker_);
+
+  // Wait for any in-flight COPY-engine work to complete before member
+  // destruction releases |input_texture_| / |upload_buffer_|. Those members
+  // are declared after |copy_command_queue_| and are therefore destroyed
+  // first; without this explicit wait the COPY engine may still be DMA-ing
+  // into a freed committed resource when their last ComPtr ref is Released.
+  if (copy_command_queue_) {
+    copy_command_queue_->WaitSync();
+  }

   if (!error_occurred_ && encoded_at_least_one_frame_) {
     base::UmaHistogramEnumeration(