FIG. 1 is a perspective view of an audio-video converter box, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an operational perspective view thereof for reference showing the audio-video converter box mounted in a holder, wherein the broken lines are shown for illustrative purposes only and form no part of the claimed design.