I am developing an analog capture filter driver. There was an AV sync issue after the long time live source playback (>2 hr). The audio pin always queue few buffers after long time playback. I have checked the video and audio PTS with each media transfer sample, they look like no problem. I have a question with Default Directsound Device filter. There is information in Default Directsound Device Properties->Advanced->Slaving Info->Rate. The "Rate"Â should be 48KHz with my device, but it will be changed with the "High Err"Â and "Low Err"Â parameters. Could I set any parameter to change the "High Err"Â or "Low Err"Â value in audio output pin of analog capture filter?