The VCAM tweak is not a physical modification. It is a metadata edit—usually within a configuration file ( .xml or .conf ) used by custom camera ports like (Google Camera ported to non-Pixel devices). Enthusiasts discovered that by altering parameters labeled vcam_* , they could command the ISP to behave differently.
The virtual camera does not compress—the receiving app does. To force high quality: vcam tweak high quality
For power users who do not want the overhead of OBS and prefer a direct driver connection (like the generic driver), "tweaking" involves forcing the video format. The VCAM tweak is not a physical modification