The present disclosure provides a live video broadcast method performed by a terminal device. The method includes: receiving a live broadcast command to live broadcast a video game in real time, and creating a video buffer for the video game based on the live broadcast command; while playing the video game in real time, extracting video picture frames from the video game and storing them in the video buffer; collecting voice data by using a microphone of the terminal device, and synchronously synthesize the voice data and the video picture frames stored in the video buffer into a video streaming media file; and uploading the video streaming media file to a live broadcast server for live broadcasting the video streaming media file on other mobile devices.