A video server is configured to provide streaming video to players of computer games over a computing network. The video server can provided video of different games to different players simultaneously. This is accomplished by rendering several video streams in parallel using a single GPU (Graphics Processing Unit). The output of the GPU is provided to graphics processing pipelines that are each associated with a specific client/player and are dynamically allocated as needed. A client qualifier may be used to assure that only clients capable of presenting the streaming video to a player at a minimum level of quality receive the video stream. Video frames provided by the video server optionally include overlays added to the output of the GPU. These overlays can include voice data received from another game player. These overlays may be used to prevent presentation of non-allowed input controls.