Im using tuneblade on windows to stream system wide audio to Rpi4 running volumio, with ‘real time streaming’ and ‘DAC/DSP delay’ setting to max, audio and video are almost in sync, I could maybe tolerate the slight delay but with real time streaming there is frequent stutter and drop out so it unusable.
When I used Airplay on a Mac to stream system audio to the Rpi4 it was either able to synchronise the audio and video or reduce delay to unnoticeable amounts without stuttering somehow, at least it could do it in browsers.
Is there no way to achieve this on windows?