Audio output
Select the Windows playback device used for editor monitoring. If sound disappears after a device change, stop playback, choose the active device and restart the preview. Windows volume/mute and SmartCut64 volume both affect monitoring.
Video decode
Preview decode can use one GPU adapter through supported D3D11VA/Vulkan paths or software fallback. This choice does not force the same encoder for output; smart-render boundary GOPs remain software encoded.
Troubleshoot
- Run the Hardware Acceleration Self-Test for the source codec.
- Force software decode if frames freeze or advance irregularly.
- Confirm the selected source audio stream and device are not muted.
- Use View > Show Log for backend-open or audio-device errors.